mirror of
https://github.com/pkimpel/retro-b5500.git
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1c430583cd
2. Fully implement Double Precision Add/Subtract (DLA/DLS), Multiply (DLM), and Divide (DLD) syllables. 3. Replace standard setTimeout() by redesigned setCallback() mechanism throughout the emulator for scheduling timing delays and other callbacks on the Javascript thread. Delete obsolete setImmediate() mechanism. 4. Replace "new Date().getTime()" by "performance.now()" calls for greater timer precision. 5. Minor tweaks to Single Precision arithmetic operators. 6. Replace Javascript postfix operators by prefix operators wherever feasible (e.g., x++ becomes ++x). 8. Attempt to correct character translation and keyboard filtering in DatacomUnit for CANDE. 9. Minor changes to button colors and illumination behavior for I/O devices and Console. 10. Suppress I/O device classes in B5500SyllableDebugger by default (uncomment in source to enable). . Drop support for webkitIndexedDB and mozIndexedDB (for now). . Configure four tape drives (MTA-MTD) by default.
802 lines
31 KiB
JavaScript
802 lines
31 KiB
JavaScript
/***********************************************************************
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* retro-b5500/emulator B5500DatacomUnit.js
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************************************************************************
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* Copyright (c) 2012, Nigel Williams and Paul Kimpel.
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* Licensed under the MIT License, see
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* http://www.opensource.org/licenses/mit-license.php
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************************************************************************
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* B5500 Datacom Peripheral Unit module.
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*
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* Defines a Datacom peripheral unit type that implements:
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* - The B249 Data Transmission Control Unit (DTCU), with
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* - A single B487 Data Transmission Terminal Unit (DTTU), having
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* - A single type 980 (teletype) adapter with a 112-character buffer.
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*
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* The user interface emulates a simple teletype device, similar to the SPO.
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*
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* Note that the results from the DCA are unusual, in that the terminal unit
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* (TU) and buffer numbers are returned in [8:10] of the error mask.
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*
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************************************************************************
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* 2013-10-19 P.Kimpel
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* Original version, cloned from B5500SPOUnit.js.
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***********************************************************************/
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"use strict";
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/**************************************/
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function B5500DatacomUnit(mnemonic, unitIndex, designate, statusChange, signal) {
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/* Constructor for the DatacomUnit object */
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this.maxScrollLines = 1500; // Maximum amount of printer scrollback
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this.charPeriod = 100; // Printer speed, milliseconds per character
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this.bufferSize = 112; // 4 28-character B487 buffer segments
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this.mnemonic = mnemonic; // Unit mnemonic
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this.unitIndex = unitIndex; // Ready-mask bit number
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this.designate = designate; // IOD unit designate number
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this.statusChange = statusChange; // external function to call for ready-status change
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this.signal = signal; // external function to call for special signals (e.g,. Datacom inquiry request)
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this.buffer = new ArrayBuffer(448); // adapter buffer storage
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this.initiateStamp = 0; // timestamp of last initiation (set by IOUnit)
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this.inTimer = 0; // input setCallback() token
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this.outTimer = 0; // output setCallback() token
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this.clear();
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this.window = window.open("", mnemonic);
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if (this.window) {
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this.shutDown(); // destroy any previously-existing window
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this.window = null;
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}
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this.doc = null;
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this.paper = null;
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this.endOfPaper = null;
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this.window = window.open("../webUI/B5500DatacomUnit.html", mnemonic,
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"scrollbars,resizable,width=580,height=540");
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this.window.moveTo((screen.availWidth-this.window.outerWidth)/2, (screen.availHeight-this.window.outerHeight)/2);
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this.window.addEventListener("load", B5500CentralControl.bindMethod(B5500DatacomUnit.prototype.datacomOnload, this), false);
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}
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// this.bufState enumerations
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B5500DatacomUnit.prototype.bufNotReady = 0;
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B5500DatacomUnit.prototype.bufIdle = 1;
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B5500DatacomUnit.prototype.bufInputBusy = 2;
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B5500DatacomUnit.prototype.bufReadReady = 3;
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B5500DatacomUnit.prototype.bufOutputBusy = 4;
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B5500DatacomUnit.prototype.bufWriteReady = 5;
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B5500DatacomUnit.prototype.keyFilter = [ // Filter keyCode values to valid BCL ones
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // 00-0F
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // 10-1F
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0x20,0x7D,0x22,0x23,0x24,0x25,0x26,0x7B,0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F, // 20-2F
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0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x00,0x3D,0x00,0x3F, // 30-3F
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0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F, // 40-4F
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0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0x5B,0x7C,0x5D,0x21,0x7E, // 50-5F
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0x00,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F, // 60-6F
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0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0x00,0x00,0x00,0x7E,0x00]; // 70-7F
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/**************************************/
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B5500DatacomUnit.prototype.$$ = function $$(e) {
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return this.doc.getElementById(e);
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};
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/**************************************/
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B5500DatacomUnit.prototype.clear = function clear() {
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/* Initializes (and if necessary, creates) the datacom unit state */
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this.ready = false; // ready status
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this.busy = false; // busy status
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this.abnormal = false; // buffer in abnormal state
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this.bufIndex = 0; // current offset into buffer
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this.bufLength = 0; // current buffer length
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this.connected = false; // buffer/adapter is currently connected
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this.errorMask = 0; // error mask for finish()
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this.finish = null; // external function to call for I/O completion
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this.fullBuffer = false; // buffer is full (unterminated)
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this.interrupt = false; // buffer in interrupt state
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this.nextCharTime = 0; // next output character time
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this.printCol = 0; // current printer column
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this.bufState = this.bufNotReady; // Current state of datacom buffer
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};
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/**************************************/
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B5500DatacomUnit.prototype.hasClass = function hasClass(e, name) {
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/* returns true if element "e" has class "name" in its class list */
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var classes = e.className;
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if (!e) {
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return false;
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} else if (classes == name) {
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return true;
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} else {
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return (classes.search("\\b" + name + "\\b") >= 0);
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}
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};
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/**************************************/
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B5500DatacomUnit.prototype.addClass = function addClass(e, name) {
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/* Adds a class "name" to the element "e"s class list */
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if (!this.hasClass(e, name)) {
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e.className += (" " + name);
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}
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};
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/**************************************/
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B5500DatacomUnit.prototype.removeClass = function removeClass(e, name) {
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/* Removes the class "name" from the element "e"s class list */
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e.className = e.className.replace(new RegExp("\\b" + name + "\\b\\s*", "g"), "");
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};
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/**************************************/
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B5500DatacomUnit.prototype.showBufferIndex = function showBufferIndex() {
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/* Formats the buffer index and length, and the column counter, for display */
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this.$$("BufferOffset").innerHTML = this.bufIndex.toString();
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this.$$("BufferLength").innerHTML = this.bufLength.toString();
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this.$$("PrintColumn").innerHTML = (this.printCol+1).toString();
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};
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/**************************************/
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B5500DatacomUnit.prototype.setState = function setState(newState) {
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/* Sets a new state in this.bufState and updates the annunciators appropriately */
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this.showBufferIndex();
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if (this.abnormal) {
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this.addClass(this.$$("Abnormal"), "textLit")
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} else {
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this.removeClass(this.$$("Abnormal"), "textLit");
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}
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if (this.interrupt) {
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this.addClass(this.$$("Interrupt"), "textLit")
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} else {
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this.removeClass(this.$$("Interrupt"), "textLit");
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}
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if (this.fullBuffer) {
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this.addClass(this.$$("FullBuffer"), "textLit")
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} else {
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this.removeClass(this.$$("FullBuffer"), "textLit");
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}
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if (this.bufState != newState) {
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switch (this.bufState) {
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case this.bufNotReady:
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this.removeClass(this.$$("NotReadyState"), "textLit");
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break;
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case this.bufIdle:
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this.removeClass(this.$$("IdleState"), "textLit");
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break;
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case this.bufInputBusy:
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this.removeClass(this.$$("InputBusyState"), "textLit");
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break;
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case this.bufReadReady:
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this.removeClass(this.$$("ReadReadyState"), "textLit");
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break;
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case this.bufOutputBusy:
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this.removeClass(this.$$("OutputBusyState"), "textLit");
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break;
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case this.bufWriteReady:
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this.removeClass(this.$$("WriteReadyState"), "textLit");
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break;
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}
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switch (newState) {
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case this.bufNotReady:
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this.addClass(this.$$("NotReadyState"), "textLit");
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break;
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case this.bufIdle:
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this.addClass(this.$$("IdleState"), "textLit");
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break;
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case this.bufInputBusy:
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this.addClass(this.$$("InputBusyState"), "textLit");
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break;
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case this.bufReadReady:
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this.addClass(this.$$("ReadReadyState"), "textLit");
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break;
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case this.bufOutputBusy:
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this.addClass(this.$$("OutputBusyState"), "textLit");
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break;
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case this.bufWriteReady:
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this.addClass(this.$$("WriteReadyState"), "textLit");
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break;
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}
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this.bufState = newState;
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}
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};
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/**************************************/
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B5500DatacomUnit.prototype.termDisconnect = function termDisconnect() {
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/* Sets the status of the datacom unit to disconnected */
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if (this.connected) {
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this.bufLength = 0;
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this.bufIndex = 0;
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this.removeClass(this.$$("TermConnectBtn"), "greenLit");
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this.interrupt = true;
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this.abnormal = true;
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this.setState(this.bufIdle);
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this.signal();
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this.connected = false;
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}
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};
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/**************************************/
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B5500DatacomUnit.prototype.termConnect = function termConnect() {
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/* Sets the status of the datacom unit to connected */
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if (!this.connected) {
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this.addClass(this.$$("TermConnectBtn"), "greenLit");
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this.interrupt = true;
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this.abnormal = true;
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this.setState(this.bufWriteReady);
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this.signal();
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this.connected = true;
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}
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};
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/**************************************/
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B5500DatacomUnit.prototype.appendEmptyLine = function appendEmptyLine() {
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/* Removes excess lines already printed, then appends a new <pre> element
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to the <iframe>, creating an empty text node inside the new element */
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var count = this.paper.childNodes.length;
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while (count-- > this.maxScrollLines) {
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this.paper.removeChild(this.paper.firstChild);
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}
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this.paper.lastChild.nodeValue += String.fromCharCode(0x0A); // newline
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this.endOfPaper.scrollIntoView();
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this.paper.appendChild(this.doc.createTextNode(""));
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};
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/**************************************/
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B5500DatacomUnit.prototype.backspaceChar = function backspaceChar() {
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/* Handles backspace for datacom buffer input */
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var line = this.paper.lastChild;
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if (this.bufLength > 0) {
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this.bufIndex--;
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this.showBufferIndex();
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}
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};
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/**************************************/
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B5500DatacomUnit.prototype.printChar = function printChar(c) {
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/* Echoes the character code "c" to the terminal display */
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var col = this.printCol;
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var line = this.paper.lastChild.nodeValue;
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var len = line.length;
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if (col < 72) {
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while (len < col) {
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line += " ";
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len++;
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}
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if (len > col) {
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line = line.substring(0, col) + String.fromCharCode(c) + line.substring(col+1);
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} else {
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line += String.fromCharCode(c);
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}
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this.printCol++;
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} else {
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line = line.substring(0, 71) + String.fromCharCode(c);
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}
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this.paper.lastChild.nodeValue = line;
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};
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/**************************************/
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B5500DatacomUnit.prototype.outputChar = function outputChar() {
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/* Outputs one character from the buffer to the terminal display. If more characters remain
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to be printed, schedules itself 100 ms later to print the next one, otherwise
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calls finished(). If the column counter exceeds 72, the last character over-types.
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Note that Group Mark (left-arrow) detection is done by IOUnit in preparing the buffer */
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var c;
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var delay;
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var nextTime;
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var stamp;
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if (this.bufIndex < this.bufLength) {
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stamp = performance.now();
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nextTime = (this.nextCharTime < stamp ? stamp : this.nextCharTime) + this.charPeriod;
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delay = nextTime - stamp;
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this.nextCharTime = nextTime;
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c = this.buffer[this.bufIndex++];
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switch (c) {
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case 0x21: // ! not-equal, output LF
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this.appendEmptyLine();
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this.outTimer = setCallback(this.mnemonic, this, delay, this.outputChar);
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break;
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case 0x3C: // < less-than, output RO (DEL)
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case 0x3E: // > greater-than, output X-ON (DC1)
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this.outTimer = setCallback(this.mnemonic, this, delay, this.outputChar);
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break; // do nothing, just delay
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case 0x7B: // { less-or-equal, output CR
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this.printCol = 0;
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this.outTimer = setCallback(this.mnemonic, this, delay, this.outputChar);
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break;
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case 0x7D: // } greater-or-equal, disconnect
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this.termDisconnect();
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break;
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case 0x7E: // ~ left-arrow, end-of-message (should never happen)
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this.bufIndex = this.bufLength;
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this.outTimer = setCallback(this.mnemonic, this, 0, this.outputChar);
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default:
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this.printChar(c);
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this.outTimer = setCallback(this.mnemonic, this, delay, this.outputChar);
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break;
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}
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this.showBufferIndex();
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} else {
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this.interrupt = true;
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this.setState(this.fullBuffer ? this.bufWriteReady : this.bufIdle);
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this.signal();
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}
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};
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/**************************************/
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B5500DatacomUnit.prototype.terminateInput = function terminateInput() {
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/* Handles the End of Message event */
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this.interrupt = true;
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this.setState(this.bufReadReady);
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this.signal();
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};
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/**************************************/
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B5500DatacomUnit.prototype.keyPress = function keyPress(ev) {
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/* Handles keyboard character events. Depending on the state of the buffer,
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either buffers the character for transmission to the I/O Unit, echos
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it to the printer, or ignores it altogether */
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var b; // translated character
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var c = ev.charCode; // input character, ASCII
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var delay; // inter-character delay, ms
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var nextTime; // next character output time, ms
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var stamp; // current timestamp, ms
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//this.$$("CharCode").innerHTML = c.toString() + ":0x" + c.toString(16);
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if (this.connected) {
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stamp = performance.now();
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if (this.bufState == this.bufIdle) {
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this.bufIndex = this.bufLength = 0;
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this.nextCharTime = stamp;
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}
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nextTime = this.nextCharTime + this.charPeriod;
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delay = nextTime - stamp;
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if (c == 0) {
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switch(ev.keyCode) {
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case 0x08:
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c = 0x3C; // BS: force Backspace key
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break;
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case 0x0D:
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c = 0x7E; // Enter: force ~ (GM) for end-of-message
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break;
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}
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} else if (ev.ctrlKey) {
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switch(c) {
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case 0x42:
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case 0x62:
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c = 0x02; // Ctrl-B: force STX, break
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break;
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case 0x45:
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case 0x65:
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c = 0x05; // Ctrl-E:force ENQ, WRU
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break;
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case 0x4C:
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case 0x6C:
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c = 0x0C; // Ctrl-L: force FF, clear input buffer
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break;
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case 0x51:
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case 0x71:
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c = 0x7E; // Ctrl-Q: DC1, X-ON to ~ (GM) for end-of-message
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break;
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default:
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c = 0; // not something we want
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break;
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}
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}
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if (this.bufState == this.bufReadReady && this.fullBuffer) {
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this.interrupt = true;
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this.setState(this.bufInputBusy);
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setCallback(this.mnemonic, this, delay, this.signal); // buffer overflow
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ev.stopPropagation();
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ev.preventDefault();
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} else if (this.bufState == this.bufInputBusy || this.bufState == this.bufIdle) {
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switch (c) {
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case 0x7E: // ~ left-arrow (Group Mark), end of message
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case 0x5F: // _ underscore (TTY left-arrow), end of message
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this.inTimer = setCallback(this.mnemonic, this, delay, this.printChar, c);
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this.nextCharTime = this.charPeriod + nextTime;
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setCallback(this.mnemonic, this, this.charPeriod+delay, this.terminateInput);
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ev.stopPropagation();
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ev.preventDefault();
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break;
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case 0x3C: // <, backspace
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if (this.bufIndex > 0) {
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this.bufIndex--;
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}
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this.inTimer = setCallback(this.mnemonic, this, delay, this.printChar, c);
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this.nextCharTime = nextTime;
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ev.stopPropagation();
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ev.preventDefault();
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break;
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case 0x21: // ! EOT, disconnect
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this.buffer[this.bufIndex++] = 0x7D; // } greater-or-equal code
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this.interrupt = true;
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this.abnomal = true;
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this.setState(this.bufReadReady);
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setCallback(this.mnemonic, this, delay, this.signal);
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this.inTimer = setCallback(this.mnemonic, this, delay, this.printChar, c);
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this.nextCharTime = nextTime;
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ev.stopPropagation();
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ev.preventDefault();
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break;
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case 0x02: // Ctrl-B, STX, break on input
|
|
this.bufIndex = this.bufLength = 0;
|
|
this.setState(this.bufIdle);
|
|
ev.stopPropagation();
|
|
ev.preventDefault();
|
|
break;
|
|
case 0x05: // Ctrl-E, ENQ, who-are-you (WRU)
|
|
if (this.bufState == this.bufIdle || this.bufState == this.bufInputBusy) {
|
|
this.interrupt = true;
|
|
this.abnormal = true;
|
|
this.setState(this.bufWriteReady);
|
|
setCallback(this.mnemonic, this, delay, this.signal);
|
|
}
|
|
ev.stopPropagation();
|
|
ev.preventDefault();
|
|
break;
|
|
case 0x0C: // Ctrl-L, FF, clear input buffer
|
|
if (this.bufState == this.bufInputBusy) {
|
|
this.bufIndex = this.bufLength = 0;
|
|
}
|
|
ev.stopPropagation();
|
|
ev.preventDefault();
|
|
break;
|
|
case 0x3F: // ? question-mark, set abnormal for control message
|
|
this.abnormal = true;
|
|
this.setState(this.bufState); // just to turn on the annunciator
|
|
// no break
|
|
default:
|
|
b = this.keyFilter[c];
|
|
if (b) { // if it's a character we will accept
|
|
this.buffer[this.bufIndex++] = b;
|
|
if (c >= 0x61 && c <= 0x7A) {
|
|
c -= 32; // up-case echoed letters
|
|
}
|
|
this.inTimer = setCallback(this.mnemonic, this, delay, this.printChar, c);
|
|
this.nextCharTime = nextTime;
|
|
if (this.bufIndex < this.bufferSize) {
|
|
this.setState(this.bufInputBusy);
|
|
} else {
|
|
this.interrupt = true;
|
|
this.fullBuffer = true;
|
|
this.setState(this.bufReadReady);
|
|
setCallback(this.mnemonic, this, this.charPeriod+delay, this.signal); // full buffer, no GM detected
|
|
}
|
|
ev.stopPropagation();
|
|
ev.preventDefault();
|
|
}
|
|
break;
|
|
} // switch c
|
|
} else if (this.bufState == this.bufOutputBusy) {
|
|
if (c == 0x02) { // Ctrl-B, STX, break on output
|
|
this.interrupt = true;
|
|
this.abnormal = true;
|
|
this.setState(this.bufReadReady);
|
|
setCallback(this.mnemonic, this, delay, this.signal);
|
|
ev.stopPropagation();
|
|
ev.preventDefault();
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
/**************************************/
|
|
B5500DatacomUnit.prototype.termConnectBtnClick = function termConnectBtnClick(ev) {
|
|
|
|
if (this.connected) {
|
|
this.termDisconnect();
|
|
} else {
|
|
this.termConnect();
|
|
}
|
|
ev.target.blur(); // move focus off the Connect btn
|
|
this.paper.focus();
|
|
};
|
|
|
|
/**************************************/
|
|
B5500DatacomUnit.prototype.beforeUnload = function beforeUnload(ev) {
|
|
var msg = "Closing this window will make the device unusable.\n" +
|
|
"Suggest you stay on the page and minimize this window instead";
|
|
|
|
ev.preventDefault();
|
|
ev.returnValue = msg;
|
|
return msg;
|
|
};
|
|
|
|
/**************************************/
|
|
B5500DatacomUnit.prototype.datacomOnload = function datacomOnload() {
|
|
/* Initializes the datacom unit and terminal window user interface */
|
|
var x;
|
|
|
|
this.doc = this.window.document;
|
|
this.doc.title = "retro-B5500 " + this.mnemonic + ": TU/BUF=01/00";
|
|
this.paper = this.doc.createElement("pre");
|
|
this.paper.appendChild(this.doc.createTextNode(""));
|
|
this.$$("TermOut").contentDocument.body.appendChild(this.paper);
|
|
this.endOfPaper = this.doc.createElement("div");
|
|
this.endOfPaper.appendChild(this.doc.createTextNode("\xA0"));
|
|
this.$$("TermOut").contentDocument.body.appendChild(this.endOfPaper);
|
|
this.$$("TermOut").contentDocument.head.innerHTML += "<style>" +
|
|
"BODY {background-color: white} " +
|
|
"PRE {margin: 0; font-size: 8pt; font-family: Lucida Sans Typewriter, Courier New, Courier, monospace}" +
|
|
"</style>";
|
|
|
|
this.window.focus();
|
|
this.nextCharTime = performance.now();
|
|
|
|
this.window.addEventListener("beforeunload", this.beforeUnload, false);
|
|
|
|
this.window.addEventListener("keypress", B5500CentralControl.bindMethod(B5500DatacomUnit.prototype.keyPress, this), false);
|
|
this.$$("TermOut").contentDocument.body.addEventListener("keypress", B5500CentralControl.bindMethod(B5500DatacomUnit.prototype.keyPress, this), false);
|
|
|
|
this.$$("TermConnectBtn").addEventListener("click", B5500CentralControl.bindMethod(B5500DatacomUnit.prototype.termConnectBtnClick, this), false);
|
|
|
|
for (x=0; x<32; x++) {
|
|
this.appendEmptyLine();
|
|
}
|
|
this.statusChange(1); // make DCA ready
|
|
};
|
|
|
|
/**************************************/
|
|
B5500DatacomUnit.prototype.read = function read(finish, buffer, length, mode, control) {
|
|
/* Initiates a read operation on the unit. "control" is the TU/BUF# */
|
|
var actualLength = 0;
|
|
var bufNr;
|
|
var tuNr;
|
|
var transparent;
|
|
var x;
|
|
|
|
this.errorMask = 0x100 + (mode & 0x01)*0x800; // set the read [24:1] and mode [21:1] bits in the mask
|
|
bufNr = control % 0x10;
|
|
transparent = (control % 0x20) >>> 4;
|
|
tuNr = (control % 0x200) >>> 5;
|
|
|
|
switch (true) {
|
|
case tuNr != 1:
|
|
case bufNr != 0:
|
|
this.errorMask |= 0x34; // not this TU/BUF -- set buffer not ready
|
|
break;
|
|
case !this.connected:
|
|
this.errorMask |= 0x34; // not connected -- set buffer not ready
|
|
break;
|
|
case this.bufState == this.bufReadReady:
|
|
// Copy the adapter buffer to the IOUnit buffer
|
|
actualLength = (transparent ? this.bufferSize : this.bufIndex);
|
|
for (x=0; x<actualLength; x++) {
|
|
buffer[x] = this.buffer[x];
|
|
}
|
|
|
|
// Set the state bits in the result and reset the adapter to idle
|
|
if (this.abnormal) {
|
|
this.errorMask |= 0x200; // set abnormal bit
|
|
}
|
|
if (this.fullBuffer || transparent) {
|
|
this.errorMask |= 0x80; // set no-GM/buffer-exhausted bit
|
|
}
|
|
this.bufIndex = this.bufLength = 0;
|
|
this.interrupt = false;
|
|
this.abnormal = false;
|
|
this.fullBuffer = false;
|
|
this.setState(this.bufIdle);
|
|
break;
|
|
case this.bufState == this.bufWriteReady:
|
|
this.errorMask |= 0x20; // attempt to read a write-ready buffer
|
|
break;
|
|
case this.bufState == this.bufInputBusy:
|
|
case this.bufState == this.bufOutputBusy:
|
|
this.errorMask |= 0x30; // buffer busy
|
|
break;
|
|
default:
|
|
this.errorMask |= 0x34; // buffer idle or not ready
|
|
break;
|
|
} // switch (true)
|
|
|
|
this.errorMask += bufNr*0x40000000 + tuNr*0x800000000;
|
|
|
|
//console.log(this.mnemonic + " Read: " + control.toString(8) + ":" + this.errorMask.toString(8) + " (" +
|
|
// actualLength + ") " + (actualLength ? String.fromCharCode.apply(null, buffer.subarray(0, actualLength)) : 0));
|
|
|
|
finish(this.errorMask, actualLength);
|
|
};
|
|
|
|
/**************************************/
|
|
B5500DatacomUnit.prototype.space = function space(finish, length, control) {
|
|
/* Initiates a space operation on the unit */
|
|
|
|
finish(0x04, 0); // report unit not ready
|
|
};
|
|
|
|
/**************************************/
|
|
B5500DatacomUnit.prototype.write = function write(finish, buffer, length, mode, control) {
|
|
/* Initiates a write operation on the unit. "control" is the TU/BUF# */
|
|
var actualLength = 0;
|
|
var bufNr;
|
|
var tuNr;
|
|
var transparent;
|
|
var x;
|
|
|
|
this.errorMask = (mode & 0x01)*0x800; // set the mode [21:1] bit in the mask
|
|
bufNr = control % 0x10;
|
|
transparent = (control % 0x20) >>> 4;
|
|
tuNr = (control % 0x200) >>> 5;
|
|
|
|
switch (true) {
|
|
case tuNr != 1:
|
|
case bufNr != 0:
|
|
this.errorMask |= 0x34; // not this TU/BUF -- buffer not ready
|
|
break;
|
|
case !this.connected:
|
|
this.errorMask |= 0x34; // not connected -- buffer not ready
|
|
break;
|
|
case this.bufState == this.bufIdle:
|
|
case this.bufState == this.bufWriteReady:
|
|
// Copy the IOUnit buffer to the adapter buffer
|
|
if (transparent) {
|
|
actualLength = this.bufferSize;
|
|
this.fullBuffer = false; // or should it be true for transparent?
|
|
} else if (length < this.bufferSize) {
|
|
actualLength = length;
|
|
this.fullBuffer = false;
|
|
} else {
|
|
actualLength = this.bufferSize;
|
|
this.fullBuffer = true;
|
|
}
|
|
for (x=0; x<actualLength; x++) {
|
|
this.buffer[x] = buffer[x];
|
|
}
|
|
|
|
// Set the state bits in the result and start printing
|
|
if (this.abnormal) {
|
|
this.errorMask |= 0x200; // set abnormal bit
|
|
}
|
|
if (this.fullBuffer || transparent) {
|
|
this.errorMask |= 0x80; // set no-GM/buffer-exhausted bit
|
|
}
|
|
this.bufIndex = 0;
|
|
this.bufLength = actualLength;
|
|
this.interrupt = false;
|
|
this.abnormal = false;
|
|
this.setState(this.bufOutputBusy);
|
|
this.nextCharTime = this.initiateStamp;
|
|
this.outputChar(); // start the printing process
|
|
break;
|
|
case this.bufState == this.bufReadReady:
|
|
this.errorMask |= 0x20; // attempt to write a read-ready buffer
|
|
break;
|
|
case this.bufState == this.bufInputBusy:
|
|
case this.bufState == this.bufOutputBusy:
|
|
this.errorMask |= 0x30; // buffer busy
|
|
break;
|
|
default:
|
|
this.errorMask |= 0x34; // buffer not ready
|
|
break;
|
|
} // switch (true)
|
|
|
|
this.errorMask += bufNr*0x40000000 + tuNr*0x800000000;
|
|
|
|
//console.log(this.mnemonic + " Write: " + control.toString(8) + ":" + this.errorMask.toString(8) + " (" +
|
|
// actualLength + ") " + (actualLength ? String.fromCharCode.apply(null, buffer.subarray(0, actualLength)) : ""));
|
|
|
|
finish(this.errorMask, actualLength);
|
|
};
|
|
|
|
/**************************************/
|
|
B5500DatacomUnit.prototype.erase = function erase(finish, length) {
|
|
/* Initiates an erase operation on the unit */
|
|
|
|
finish(0x04, 0); // report unit not ready
|
|
};
|
|
|
|
/**************************************/
|
|
B5500DatacomUnit.prototype.rewind = function rewind(finish) {
|
|
/* Initiates a rewind operation on the unit */
|
|
|
|
finish(0x04, 0); // report unit not ready
|
|
};
|
|
|
|
/**************************************/
|
|
B5500DatacomUnit.prototype.readCheck = function readCheck(finish, length, control) {
|
|
/* Initiates a read check operation on the unit */
|
|
|
|
finish(0x04, 0); // report unit not ready
|
|
};
|
|
|
|
/**************************************/
|
|
B5500DatacomUnit.prototype.readInterrogate = function readInterrogate(finish, control) {
|
|
/* Initiates a read interrogate operation on the unit */
|
|
|
|
finish(0x04, 0); // report unit not ready
|
|
};
|
|
|
|
/**************************************/
|
|
B5500DatacomUnit.prototype.writeInterrogate = function writeInterrogate(finish, control) {
|
|
/* Initiates a write interrogate operation on the unit. "control" is the TU/BUF# */
|
|
var bufNr;
|
|
var tuNr;
|
|
|
|
this.errorMask = 0; // default result is idle
|
|
bufNr = control % 0x10;
|
|
tuNr = (control % 0x200) >>> 5;
|
|
|
|
if (tuNr > 1) {
|
|
this.errorMask |= 0x34; // not a valid TU/BUF -- report not ready
|
|
} else if (tuNr == 1 && bufNr > 0) {
|
|
this.errorMask |= 0x34 // not a valid BUF for TU#1 -- report not ready
|
|
} else if (tuNr == 0) {
|
|
if (this.interrupt) {
|
|
tuNr = 1;
|
|
bufNr = 0;
|
|
}
|
|
}
|
|
|
|
if (tuNr == 1 && bufNr == 0) {
|
|
switch (this.bufState) {
|
|
case this.bufReadReady:
|
|
this.errorMask |= 0x100;
|
|
break;
|
|
case this.bufWriteReady:
|
|
this.errorMask |= 0x20;
|
|
break;
|
|
case this.bufInputBusy:
|
|
case this.bufOUtputBusy:
|
|
this.errorMask |= 0x10;
|
|
break;
|
|
case this.bufIdle:
|
|
// default value, no action
|
|
break;
|
|
default:
|
|
this.errorMask |= 0x14; // report not ready
|
|
break;
|
|
} // switch (this.bufState)
|
|
|
|
if (this.abnormal) {
|
|
this.errorMask |= 0x200; // set abnormal bit
|
|
}
|
|
this.interrupt = false;
|
|
this.setState(this.bufState);
|
|
}
|
|
|
|
this.errorMask += bufNr*0x40000000 + tuNr*0x800000000;
|
|
|
|
//console.log(this.mnemonic + " W-Int: " + control.toString(8) + ":" + this.errorMask.toString(8));
|
|
|
|
finish(this.errorMask, 0);
|
|
};
|
|
|
|
/**************************************/
|
|
B5500DatacomUnit.prototype.shutDown = function shutDown() {
|
|
/* Shuts down the device */
|
|
|
|
if (this.inTimer) {
|
|
clearCallback(this.inTimer);
|
|
}
|
|
if (this.outTimer) {
|
|
clearCallback(this.outTimer);
|
|
}
|
|
this.window.removeEventListener("beforeunload", this.beforeUnload, false);
|
|
this.window.close();
|
|
};
|