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pkimpel.retro-b5500/emulator/B5500CentralControl.js
paul 6df7a312de Commit DCMCP transcription as of 2013-01-21. 
Debug ISO, TRB, FCE, FCL syllables in Processor.
2013-01-21 14:15:03 +00:00

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/***********************************************************************
* retro-b5500/emulator B5500CentralControl.js
************************************************************************
* Copyright (c) 2012, Nigel Williams and Paul Kimpel.
* Licensed under the MIT License,
* see http://www.opensource.org/licenses/mit-license.php
************************************************************************
* B5500 Central Control module.
************************************************************************
* 2012-06-03 P.Kimpel
* Original version, from thin air.
***********************************************************************/
"use strict";
/**************************************/
function B5500CentralControl() {
/* Constructor for the Central Control module object */
/* Global system modules */
this.DD = null; // Distribution & Display unit
this.PA = null; // Processor A (PA)
this.PB = null; // Processor B (PB)
this.IO1 = null; // I/O unit 1
this.IO2 = null; // I/O unit 2
this.IO3 = null; // I/O unit 3
this.IO4 = null; // I/O unit 4
this.P1 = null; // Reference for Processor 1 (control) [PA or PB]
this.P2 = null; // Reference for Processor 2 (slave) [PA or PB]
this.addressSpace = [ // Array of memory module address spaces (8 x 32KB each)
null, null, null, null, null, null, null, null];
this.memMod = [ // Array of memory module words as Float64s (8 x 4KW each)
null, null, null, null, null, null, null, null];
this.unit = [ // Array of peripheral units, indexed by ready-mask bit number
null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null];
// Instance variables and flags
this.poweredUp = 0; // System power indicator
this.unitStatusMask = 0; // Peripheral unit ready-status bitmask
this.unitBusyMask = 0; // Peripheral unit busy-status bitmask
this.PB1L = 0; // 0=> PA is P1, 1=> PB is P1
this.cardLoadSelect = 0; // 0=> load from disk/drum; 1=> load from cards
this.nextTimeStamp = 0; // Next actual Date.getTime() for timer tick
this.timer = null; // Reference to the RTC setTimeout id.
this.loadTimer = null; // Reference to the load setTimeout id.
this.tock.that = this; // Establish contexts for when called from setTimeout().
this.loadComplete.that = this;
this.clear(); // Create and initialize the Central Control state
}
/**************************************/
/* Global constants */
B5500CentralControl.version = "0.01";
B5500CentralControl.rtcTick = 1000/60; // Real-time clock period, milliseconds
B5500CentralControl.pow2 = [ // powers of 2 from 0 to 52
0x1, 0x2, 0x4, 0x8,
0x10, 0x20, 0x40, 0x80,
0x100, 0x200, 0x400, 0x800,
0x1000, 0x2000, 0x4000, 0x8000,
0x10000, 0x20000, 0x40000, 0x80000,
0x100000, 0x200000, 0x400000, 0x800000,
0x1000000, 0x2000000, 0x4000000, 0x8000000,
0x10000000, 0x20000000, 0x40000000, 0x80000000,
0x100000000, 0x200000000, 0x400000000, 0x800000000,
0x1000000000, 0x2000000000, 0x4000000000, 0x8000000000,
0x10000000000, 0x20000000000, 0x40000000000, 0x80000000000,
0x100000000000, 0x200000000000, 0x400000000000, 0x800000000000,
0x1000000000000, 0x2000000000000, 0x4000000000000, 0x8000000000000,
0x10000000000000];
B5500CentralControl.mask2 = [ // (2**n)-1 For n From 0 to 52
0x0, 0x1, 0x3, 0x7,
0x0F, 0x1F, 0x3F, 0x7F,
0x0FF, 0x1FF, 0x3FF, 0x7FF,
0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF,
0x0FFFF, 0x1FFFF, 0x3FFFF, 0x7FFFF,
0x0FFFFF, 0x1FFFFF, 0x3FFFFF, 0x7FFFFF,
0x0FFFFFF, 0x1FFFFFF, 0x3FFFFFF, 0x7FFFFFF,
0x0FFFFFFF, 0x1FFFFFFF, 0x3FFFFFFF, 0x7FFFFFFF,
0x0FFFFFFFF, 0x1FFFFFFFF, 0x3FFFFFFFF, 0x7FFFFFFFF,
0x0FFFFFFFFF, 0x1FFFFFFFFF, 0x3FFFFFFFFF, 0x7FFFFFFFFF,
0x0FFFFFFFFFF, 0x1FFFFFFFFFF, 0x3FFFFFFFFFF, 0x7FFFFFFFFFF,
0x0FFFFFFFFFFF, 0x1FFFFFFFFFFF, 0x3FFFFFFFFFFF , 0x7FFFFFFFFFFF,
0x0FFFFFFFFFFFF, 0x1FFFFFFFFFFFF, 0x3FFFFFFFFFFFF, 0x7FFFFFFFFFFFF,
0x0FFFFFFFFFFFFF] ;
// The following two-dimensional array translates unit designates to a unique 1-relative
// peripheral unit index. This index is the same as the unit's ready-status bit number,
// which is why they are in the range 17..47. The [0] dimension determines the index
// when writing; the [1] dimension determines the index when reading. This approach
// is necessary since some unit designates map to two different devices depending
// on IOD.[24:1], e.g. designate 14=CPA/CRA (status bits 23/24).
B5500CentralControl.unitIndex = [
// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
[null, 47,null, 46, 31, 45, 29, 44, 30, 43, 25, 42, 28, 41,null, 40,
17, 39, 21, 38, 18, 37, 27, 36,null, 35, 26, 34,null, 33, 22, 32],
[null, 47,null, 46, 31, 45, 29, 44, 30, 43, 24, 42, 28, 41, 23, 40,
17, 39, 20, 38, 19, 37,null, 36,null, 35,null, 34,null, 33, 22, 32]];
// The following object maps the unit mnemonics from B5500SystemConfiguration.units
// to the attributes needed to configure the CC unit[] array.
B5500CentralControl.unitSpecs = {
SPO: {unitIndex: 22, designate: 30, unitClass: B5500SPOUnit},
DKA: {unitIndex: 29, designate: 6, unitClass: B5500DiskUnit},
DKB: {unitIndex: 28, designate: 12, unitClass: B5500DiskUnit},
CRA: {unitIndex: 24, designate: 10, unitClass: null},
CRB: {unitIndex: 23, designate: 14, unitClass: null},
CPA: {unitIndex: 25, designate: 10, unitClass: null},
LPA: {unitIndex: 27, designate: 22, unitClass: null},
LPB: {unitIndex: 26, designate: 26, unitClass: null},
PRA: {unitIndex: 20, designate: 18, unitClass: null},
PRB: {unitIndex: 19, designate: 20, unitClass: null},
PPA: {unitIndex: 21, designate: 18, unitClass: null},
PPB: {unitIndex: 18, designate: 20, unitClass: null},
DCA: {unitIndex: 17, designate: 16, unitClass: null},
DRA: {unitIndex: 31, designate: 4, unitClass: null},
DRB: {unitIndex: 30, designate: 8, unitClass: null},
MTA: {unitIndex: 47, designate: 1, unitClass: null},
MTB: {unitIndex: 46, designate: 3, unitClass: null},
MTC: {unitIndex: 45, designate: 5, unitClass: null},
MTD: {unitIndex: 44, designate: 7, unitClass: null},
MTE: {unitIndex: 43, designate: 9, unitClass: null},
MTF: {unitIndex: 42, designate: 11, unitClass: null},
MTH: {unitIndex: 41, designate: 13, unitClass: null},
MTJ: {unitIndex: 40, designate: 15, unitClass: null},
MTK: {unitIndex: 39, designate: 17, unitClass: null},
MTL: {unitIndex: 38, designate: 19, unitClass: null},
MTM: {unitIndex: 37, designate: 21, unitClass: null},
MTN: {unitIndex: 36, designate: 23, unitClass: null},
MTP: {unitIndex: 35, designate: 25, unitClass: null},
MTR: {unitIndex: 34, designate: 27, unitClass: null},
MTS: {unitIndex: 33, designate: 29, unitClass: null},
MTT: {unitIndex: 32, designate: 31, unitClass: null}};
/**************************************/
B5500CentralControl.prototype.clear = function() {
/* Initializes (and if necessary, creates) the system and starts the
real-time clock */
if (this.timer) {
clearTimeout(this.timer);
}
this.nextTimeStamp = new Date().getTime() + B5500CentralControl.rtcTick;
this.timer = setTimeout(this.tock, B5500CentralControl.rtcTick);
this.IAR = 0; // Interrupt address register
this.TM = 0; // Real-time clock (6 bits, 60 ticks per second)
this.CCI03F = 0; // Time interval interrupt
this.CCI04F = 0; // I/O busy interrupt
this.CCI05F = 0; // Keyboard request interrupt
this.CCI06F = 0; // Printer 1 finished interrupt
this.CCI07F = 0; // Printer 2 finished interrupt
this.CCI08F = 0; // I/O unit 1 finished interrupt (RD in @14)
this.CCI09F = 0; // I/O unit 2 finished interrupt (RD in @15)
this.CCI10F = 0; // I/O unit 3 finished interrupt (RD in @16)
this.CCI11F = 0; // I/O unit 4 finished interrupt (RD in @17)
this.CCI12F = 0; // P2 busy interrupt
this.CCI13F = 0; // Remote inquiry request interrupt
this.CCI14F = 0; // Special interrupt #1 (not used)
this.CCI15F = 0; // Disk file #1 read check finished
this.CCI16F = 0; // Disk file #2 read check finished
this.MCYF = 0; // Memory cycle FFs (one bit per M0..M7)
this.PAXF = 0; // PA memory exchange select (M0..M7)
this.PBXF = 0; // PB memory exchange select (M0..M7)
this.I1XF = 0; // I/O unit 1 exchange select (M0..M7)
this.I2XF = 0; // I/O unit 2 exchange select (M0..M7)
this.I3XF = 0; // I/O unit 3 exchange select (M0..M7)
this.I4XF = 0; // I/O unit 4 exchange select (M0..M7)
this.AD1F = 0; // I/O unit 1 busy
this.AD2F = 0; // I/O unit 2 busy
this.AD3F = 0; // I/O unit 3 busy
this.AD4F = 0; // I/O unit 4 busy
this.LOFF = 0; // Load button pressed on console
this.CTMF = 0; // Commence timing FF
this.P2BF = 0; // Processor 2 busy FF
this.HP2F = 1; // Halt processor 2 FF
if (this.PA) {
this.PA.clear();
}
if (this.PB) {
this.PB.clear();
}
this.P1 = (this.PB1L ? this.PB : this.PA);
this.P2 = (this.PB1L ? this.PA : this.PB);
if (!this.P2) {
this.P2BF = 1; // mark non-existent P2 as busy
}
};
/**************************************/
B5500CentralControl.prototype.bit = function(word, bit) {
/* Extracts and returns the specified bit from the word */
var e = 47-bit; // word lower power exponent
var p; // bottom portion of word power of 2
if (e > 0) {
return ((word - word % (p = B5500CentralControl.pow2[e]))/p) % 2;
} else {
return word % 2;
}
};
/**************************************/
B5500CentralControl.prototype.bitSet = function(word, bit) {
/* Sets the specified bit in word and returns the updated word */
var ue = 48-bit; // word upper power exponent
var le = ue-1; // word lower power exponent
var bpower = 1; // bottom portion of word power of 2
var bottom = // unaffected bottom portion of word
(le == 0 ? 0 : (word % (bpower = B5500CentralControl.pow2[le])));
var top = // unaffected top portion of word
(bit == 0 ? 0 : (word - (word % B5500CentralControl.pow2[ue])));
return bpower + top + bottom;
};
/**************************************/
B5500CentralControl.prototype.bitReset = function(word, bit) {
/* Resets the specified bit in word and returns the updated word */
var ue = 48-bit; // word upper power exponent
var le = ue-1; // word lower power exponent
var bottom = // unaffected bottom portion of word
(le == 0 ? 0 : (word % B5500CentralControl.pow2[le]));
var top = // unaffected top portion of word
(bit == 0 ? 0 : (word - (word % B5500CentralControl.pow2[ue])));
return top + bottom;
};
/**************************************/
B5500CentralControl.prototype.fieldIsolate = function(word, start, width) {
/* Extracts a bit field [start:width] from word and returns the field */
var le = 48-start-width; // lower power exponent
var p; // bottom portion of word power of 2
return (le == 0 ? word :
(word - word % (p = B5500CentralControl.pow2[le]))/p
) % B5500CentralControl.pow2[width];
};
/**************************************/
B5500CentralControl.prototype.fieldInsert = function(word, start, width, value) {
/* Inserts a bit field from the low-order bits of value ([48-width:width])
into word.[start:width] and returns the updated word */
var ue = 48-start; // word upper power exponent
var le = ue-width; // word lower power exponent
var bpower = 1; // bottom portion of word power of 2
var bottom = // unaffected bottom portion of word
(le == 0 ? 0 : (word % (bpower = B5500CentralControl.pow2[le])));
var top = // unaffected top portion of word
(ue == 0 ? 0 : (word - (word % B5500CentralControl.pow2[ue])));
return (value % B5500CentralControl.pow2[width])*bpower + top + bottom;
};
/**************************************/
B5500CentralControl.prototype.fieldTransfer = function(word, wstart, width, value, vstart) {
/* Inserts a bit field from value.[vstart:width] into word.[wstart:width] and
returns the updated word */
var ue = 48-wstart; // word upper power exponent
var le = ue-width; // word lower power exponent
var ve = 48-vstart-width; // value lower power exponent
var vpower; // bottom port of value power of 2
var bpower = 1; // bottom portion of word power of 2
var bottom = // unaffected bottom portion of word
(le == 0 ? 0 : (word % (bpower = B5500CentralControl.pow2[le])));
var top = // unaffected top portion of word
(ue == 0 ? 0 : (word - (word % B5500CentralControl.pow2[ue])));
return ((ve == 0 ? value :
(value - value % (vpower = B5500CentralControl.pow2[ve]))/vpower
) % B5500CentralControl.pow2[width]
)*bpower + top + bottom;
};
/**************************************/
B5500CentralControl.prototype.fetch = function(acc) {
/* Called by a requestor module passing accessor object "acc" to fetch a
word from memory. */
var addr = acc.addr;
var modNr = addr >>> 12;
var modAddr = addr & 0x0FFF;
var modMask = 1 << modNr;
this.MCYF |= modMask; // !! need to figure out when to turn this off for display purposes
// (odd/even addresses? fetch vs. store? XOR the mask?)
switch (acc.requestorID) {
case "A":
this.PAXF = modMask;
break;
case "B":
this.PBXF = modMask;
break;
case "1":
this.I1XF = modMask;
break;
case "2":
this.I2XF = modMask;
break;
case "3":
this.I3XF = modMask;
break;
case "4":
this.I4XF = modMask;
break;
}
// For now, we assume memory parity can never happen
if (acc.MAIL || !this.memMod[modNr]) {
acc.MPED = 0; // no memory parity error
acc.MAED = 1; // memory address error
// no .word value is returned in this case
} else {
acc.MPED = 0; // no parity error
acc.MAED = 0; // no address error
acc.word = this.memMod[modNr][modAddr];
}
};
/**************************************/
B5500CentralControl.prototype.store = function(acc) {
/* Called by requestor module passing accessor object "acc" to store a
word into memory. */
var addr = acc.addr;
var modNr = addr >>> 12;
var modAddr = addr & 0x0FFF;
var modMask = 1 << modNr;
this.MCYF |= modMask; // !! need to figure out when to turn this off for display purposes
// (odd/even addresses? fetch vs. store? XOR the mask?)
switch (acc.requestorID) {
case "A":
this.PAXF = modMask;
break;
case "B":
this.PBXF = modMask;
break;
case "1":
this.I1XF = modMask;
break;
case "2":
this.I2XF = modMask;
break;
case "3":
this.I3XF = modMask;
break;
case "4":
this.I4XF = modMask;
break;
}
// For now, we assume memory parity can never happen
if (acc.MAIL || !this.memMod[modNr]) {
acc.MPED = 0; // no memory parity error
acc.MAED = 1; // memory address error
// no word is stored in this case
} else {
acc.MPED = 0; // no parity error
acc.MAED = 0; // no address error
this.memMod[modNr][modAddr] = acc.word;
}
};
/**************************************/
B5500CentralControl.prototype.signalInterrupt = function() {
/* Called by all modules to signal that an interrupt has occurred and
to invoke the interrupt prioritization mechanism. This will result in
an updated vector address in the IAR. Can also be called to reprioritize
any remaining interrupts after an interrupt is handled. If no interrupt
condition exists, this.IAR is set to zero. */
var p1 = this.P1;
var p2;
this.IAR = p1.I & 0x01 ? 0x30 // @60: P1 memory parity error
: p1.I & 0x02 ? 0x31 // @61: P1 invalid address error
: this.CCI03F ? 0x12 // @22: Time interval
: this.CCI04F ? 0x13 // @23: I/O busy
: this.CCI05F ? 0x14 // @24: Keyboard request
: this.CCI08F ? 0x17 // @27: I/O 1 finished
: this.CCI09F ? 0x18 // @30: I/O 2 finished
: this.CCI10F ? 0x19 // @31: I/O 3 finished
: this.CCI11F ? 0x1A // @32: I/O 4 finished
: this.CCI06F ? 0x15 // @25: Printer 1 finished
: this.CCI07F ? 0x16 // @26: Printer 2 finished
: this.CCI12F ? 0x1B // @33: P2 busy
: this.CCI13F ? 0x1C // @34: Inquiry request
: this.CCI14F ? 0x1D // @35: Special interrupt 1
: this.CCI15F ? 0x1E // @36: Disk file 1 read check finished
: this.CCI16F ? 0x1F // @37: Disk file 2 read check finished
: p1.I & 0x04 ? 0x32 // @62: P1 stack overflow
: p1.I & 0xF0 ? (p1.I >>> 4) + 0x30 // @64-75: P1 syllable-dependent
: (p2 = this.P2) ?
( p2.I & 0x01 ? 0x20 // @40: P2 memory parity error
: p2.I & 0x02 ? 0x21 // @41: P2 invalid address error
: p2.I & 0x04 ? 0x22 // @42: P2 stack overflow
: p2.I & 0xF0 ? (p2.I >>> 4) + 0x20 // @44-55: P2 syllable-dependent
: 0
)
: 0; // no interrupt set
};
/**************************************/
B5500CentralControl.prototype.clearInterrupt = function() {
/* Resets an interrupt based on the current setting of this.IAR, then
reprioritizes any remaining interrupts, leaving the new vector address
in this.IAR. */
var p1 = this.P1;
var p2 = this.P2;
switch (this.IAR) {
case 0x12: // @22: Time interval
this.CCI03F = 0;
break;
case 0x13: // @23: I/O busy
this.CCI04F = 0;
break;
case 0x14: // @24: Keyboard request
this.CCI05F = 0;
break;
case 0x15: // @25: Printer 1 finished
this.CCI06F = 0;
break;
case 0x16: // @26: Printer 2 finished
this.CCI07F = 0;
break;
case 0x17: // @27: I/O 1 finished
this.CCI08F = 0;
this.AD1F = 0; // make unit non-busy
break;
case 0x18: // @30: I/O 2 finished
this.CCI09F = 0;
this.AD2F = 0; // make unit non-busy
break;
case 0x19: // @31: I/O 3 finished
this.CCI10F = 0;
this.AD3F = 0; // make unit non-busy
break;
case 0x1A: // @32: I/O 4 finished
this.CCI11F = 0;
this.AD4F = 0; // make unit non-busy
break;
case 0x1B: // @33: P2 busy
this.CCI12F = 0;
break;
case 0x1C: // @34: Inquiry request
this.CCI13F = 0;
break;
case 0x1D: // @35: Special interrupt 1
this.CCI14F = 0;
break;
case 0x1E: // @36: Disk file 1 read check finished
this.CCI15F = 0;
break;
case 0x1F: // @37: Disk file 2 read check finished
this.CCI16F = 0;
break;
case 0x20: // @40: P2 memory parity error
if (p2) {p2.I &= 0xFE}
break;
case 0x21: // @41: P2 invalid address error
if (p2) {p2.I &= 0xFD}
break;
case 0x22: // @42: P2 stack overflow
if (p2) {p2.I &= 0xFB}
break;
case 0x24: // @44-55: P2 syllable-dependent
case 0x25:
case 0x26:
case 0x27:
case 0x28:
case 0x29:
case 0x2A:
case 0x2B:
case 0x2C:
case 0x2D:
if (p2) {p2.I &= 0x0F}
break;
case 0x30: // @60: P1 memory parity error
p1.I &= 0xFE;
break;
case 0x31: // @61: P1 invalid address error
p1.I &= 0xFD;
break;
case 0x32: // @62: P1 stack overflow
p1.I &= 0x0B;
break;
case 0x34: // @64-75: P1 syllable-dependent
case 0x35:
case 0x36:
case 0x37:
case 0x38:
case 0x39:
case 0x3A:
case 0x3B:
case 0x3C:
case 0x3D:
p1.I &= 0x0F;
break;
default: // no interrupt vector was set
break;
}
this.signalInterrupt();
};
/**************************************/
B5500CentralControl.prototype.tock = function tock() {
/* Handles the 1/60th second real-time clock tick */
var interval; // milliseconds to next tick
var that = tock.that; // capture the current closure context
var thisTime = new Date().getTime();
if (that.TM < 63) {
that.TM++;
} else {
that.TM = 0;
/********** INHIBIT FOR NOW **********
that.CCI03F = 1; // set timer interrupt
that.signalInterrupt();
*************************************/
}
interval = (that.nextTimeStamp += B5500CentralControl.rtcTick) - thisTime;
that.timer = setTimeout(function() {that.tock()}, (interval < 0 ? 1 : interval));
};
/**************************************/
B5500CentralControl.prototype.haltP2 = function() {
/* Called by P1 to halt P2. storeForInterrupt() will set P2BF=0 */
this.HP2F = 1;
// We know P2 is not currently running on this thread, so save its registers
if (this.P2 && this.P2BF) {
this.P2.storeForInterrupt(0);
}
};
/**************************************/
B5500CentralControl.prototype.initiateP2 = function() {
/* Called by P1 to initiate P2. Assumes that an INCW has been stored at
memory location @10. If P2 is busy or not present, sets the P2 busy
interrupt. Otherwise, loads the INCW into P2's A register and initiates
the processor. */
if (!this.P2 || this.P2BF) {
this.CCI12F = 1; // set P2 busy interrupt
this.signalInterrupt();
} else {
this.P2BF = 1;
this.HP2F = 0;
this.P2.initiateAsP2();
}
};
/**************************************/
B5500CentralControl.prototype.initiateIO = function() {
/* Selects an I/O unit and initiates an I/O */
if (this.IO1 && this.IO1.REMF && !this.AD1F) {
this.AD1F = 1;
this.IO1.initiate();
} else if (this.IO2 && this.IO2.REMF && !this.AD2F) {
this.AD2F = 1;
this.IO2.initiate();
} else if (this.IO3 && this.IO3.REMF && !this.AD3F) {
this.AD3F = 1;
this.IO3.initiate();
} else if (this.IO4 && this.IO4.REMF && !this.AD4F) {
this.AD4F = 1;
this.IO4.initiate();
} else {
this.CCI04F = 1; // set I/O busy interrupt
this.signalInterrupt();
}
};
/**************************************/
B5500CentralControl.prototype.interrogateIOChannel = function() {
/* Returns a value as for the processor TIO syllable indicating the first
available and non-busy I/O Unit */
if (this.IO1 && this.IO1.REMF && !this.AD1F) {
return 1;
} else if (this.IO2 && this.IO2.REMF && !this.AD2F) {
return 2;
} else if (this.IO3 && this.IO3.REMF && !this.AD3F) {
return 3;
} else if (this.IO4 && this.IO4.REMF && !this.AD4F) {
return 4;
} else {
return 0; // All I/O Units busy
}
};
/**************************************/
B5500CentralControl.prototype.interrogateUnitStatus = function() {
/* Returns a bitmask as for the processor TUS syllable indicating the
ready status of all peripheral units */
return this.unitStatusMask;
};
/**************************************/
B5500CentralControl.prototype.testUnitReady = function(index) {
/* Determines whether the unit index "index" is currently in ready status.
Returns 1 if ready, 0 if not ready */
return (index ? this.bit(this.unitStatusMask, index) : 0);
};
/**************************************/
B5500CentralControl.prototype.testUnitBusy = function(index) {
/* Determines whether the unit index "index" is currently in use by any other
I/O Unit. Returns 1 if busy, 0 if not busy */
return (index ? this.bit(this.unitBusyMask, index) : 0);
};
/**************************************/
B5500CentralControl.prototype.setUnitBusy = function(index, busy) {
/* Sets or resets the unit-busy mask bit for unit index "index" */
if (index) {
this.unitBusyMask = (busy ? this.bitSet(this.unitBusyMask, index)
: this.bitReset(this.unitBusyMask, index));
}
};
/**************************************/
B5500CentralControl.prototype.halt = function() {
/* Halts the processors. Any in-process I/Os are allowed to complete */
if (this.PA && this.PA.busy) {
this.PA.busy = 0;
this.PA.cycleLimit = 0;
if (this.PA.scheduler) {
clearTimeout(this.PA.scheduler);
this.PA.scheduler = null;
}
}
if (this.PB && this.PB.busy) {
this.PB.busy = 0;
this.PB.cycleLimit = 0;
if (this.PB.scheduler) {
clearTimeout(this.PB.scheduler);
this.PB.scheduler = null;
}
}
if (this.loadTimer) {
clearTimeout(this.loadTimer);
this.loadTimer = null;
}
};
/**************************************/
B5500CentralControl.prototype.loadComplete = function loadComplete() {
/* Monitors an initial load I/O operation for complete status.
When complete, initiates P1 */
var completed = false; // true if some I/O Unit finished
var that = loadComplete.that; // capture the current closure context
if (that.CCI08F) { // I/O Unit 1 finished
completed = true;
that.CCI08F = 0;
that.AD1F = 0;
} else if (that.CCI09F) { // I/O Unit 2 finished
completed = true;
that.CCI09F = 0;
that.AD2F = 0;
} else if (that.CCI10F) { // I/O Unit 3 finished
completed = true;
that.CCI10F = 0;
that.AD3F = 0;
} else if (that.CCI11F) { // I/O Unit 4 finished
completed = true;
that.CCI11F = 0;
that.AD4F = 0;
} else { // Nothing finished yet (or there was an error)
that.loadTimer = setTimeout(that.loadComplete, 100);
}
if (completed) {
that.loadTimer = null;
that.LOFF = 0;
that.P1.start(0x10); // start execution at C=@20
}
};
/**************************************/
B5500CentralControl.prototype.load = function() {
/* Initiates a Load operation to start the system */
if (this.P1 && !this.P1.busy) {
this.clear();
this.LOFF = 1;
if (this.IO1 && this.IO1.REMF && !this.AD1F) {
this.AD1F = 1;
this.IO1.initiateLoad(this.cardLoadSelect);
this.loadComplete();
} else if (this.IO2 && this.IO2.REMF && !this.AD2F) {
this.AD2F = 1;
this.IO2.initiateLoad(this.cardLoadSelect);
this.loadComplete();
} else if (this.IO3 && this.IO3.REMF && !this.AD3F) {
this.AD3F = 1;
this.IO3.initiateLoad(this.cardLoadSelect);
this.loadComplete();
} else if (this.IO4 && this.IO4.REMF && !this.AD4F) {
this.AD4F = 1;
this.IO4.initiateLoad(this.cardLoadSelect);
this.loadComplete();
} else {
this.CCI04F = 1; // set I/O busy interrupt
}
}
};
/**************************************/
B5500CentralControl.prototype.loadTest = function(buf, loadAddr) {
/* Loads a test codestream into memory starting at B5500 word address
"loadAddr" from the ArrayBuffer "buf". Returns the number of B5500
words loaded into memory. Note that when loading an ESPOL "DISK" file,
the first executable location is @20, so you will typically want to load
to address 0 and call cc.runTest(0x10) [where 0x10 = @20]. This routine
should not be used to load ESPOL "DECK" files */
var addr = loadAddr; // starting B5500 memory address
var bytes = buf.byteLength;
var data = new DataView(buf); // use DataView() to avoid problems with littleendians.
var power = 0x10000000000;
var word = 0;
var x = 0;
function store(addr, word) {
/* Stores a 48-bit word at the specified B5500 address.
Invalid addresses and parity errors are ignored */
var modNr = addr >>> 12;
var modAddr = addr & 0x0FFF;
if (modNr < 8 && this.memMod[modNr]) {
this.memMod[modNr][modAddr] = word;
}
}
if (!this.poweredUp) {
throw "cc.loadTest: Cannot load with system powered off"
} else {
while (bytes > 6) {
store.call(this, addr, data.getUint32(x, false)*0x10000 + data.getUint16(x+4, false));
x += 6;
bytes -= 6;
if (++addr > 0x7FFF) {
break;
}
}
// Store any partial word that may be left
while (bytes > 0) {
word += data.getUint8(x, false)*power;
x++;
bytes--;
power /= 0x100;
}
store.call(this, addr, word);
}
return addr-loadAddr+1;
};
/**************************************/
B5500CentralControl.prototype.runTest = function(runAddr) {
/* Executes a test program previously loaded by this.loadTest on processor
P1. "runAddr" is the B5500 word address at which execution will begin
(typically 0x10 [octal 20]) */
this.clear();
this.loadTimer = null;
this.LOFF = 0;
this.P1.start(runAddr);
};
/**************************************/
B5500CentralControl.prototype.configureSystem = function() {
/* Establishes the hardware module configuration from the
B5500SystemConfiguration module */
var cfg = B5500SystemConfiguration;
var mnem;
var signal = null;
var specs;
var u;
var unitClass;
var x;
function makeChange(cc, maskBit) {
return function(ready) {
cc.unitStatusMask = (ready ? cc.bitSet(cc.unitStatusMask, maskBit)
: cc.bitReset(cc.unitStatusMask, maskBit));
};
}
function makeSignal(cc, mnemonic) {
switch (mnemonic) {
case "SPO":
return function() {
cc.CCI05F = 1;
cc.signalInterrupt();
};
break;
case "LPA":
return function() {
cc.setUnitBusy(27, 0);
cc.CCI06F = 1;
cc.signalInterrupt();
};
break;
case "LPB":
return function() {
cc.setUnitBusy(26, 0);
cc.CCI07F = 1;
cc.signalInterrupt();
};
break;
case "DKA":
return function() {
cc.setUnitBusy(29, 0);
cc.CCI15F = 1;
cc.signalInterrupt();
};
break;
case "DKB":
return function() {
cc.setUnitBusy(28, 0);
cc.CCI16F = 1;
cc.signalInterrupt();
};
break;
default:
return function() {};
break;
};
}
// ***** !! inhibit for now ***** // this.DD = new B5500DistributionAndDisplay(this);
// Configure the processors
if (cfg.PA) {this.PA = new B5500Processor("A", this)};
if (cfg.PB) {this.PB = new B5500Processor("B", this)};
// Determine P1/P2
this.PB1L = (cfg.PB1L ? 1 : 0);
// Configure the I/O Units
if (cfg.IO1) {this.IO1 = new B5500IOUnit("1", this)};
if (cfg.IO2) {this.IO2 = new B5500IOUnit("2", this)};
if (cfg.IO3) {this.IO3 = new B5500IOUnit("3", this)};
if (cfg.IO4) {this.IO4 = new B5500IOUnit("4", this)};
// Configure memory
for (x=0; x<8; x++) {
if (cfg.memMod[x]) {
this.addressSpace[x] = new ArrayBuffer(32768); // 4K B5500 words @ 8 bytes each
this.memMod[x] = new Float64Array(this.addressSpace[x]);
}
}
// Configure the peripheral units
for (mnem in cfg.units) {
if (cfg.units[mnem]) {
specs = B5500CentralControl.unitSpecs[mnem];
if (specs) {
unitClass = specs.unitClass || B5500DummyUnit;
if (unitClass) {
u = new unitClass(mnem, specs.unitIndex, specs.designate,
makeChange(this, specs.unitIndex), makeSignal(this, mnem));
this.unit[specs.unitIndex] = u;
}
}
}
}
// Peripheral unit configuration should take place here once we have it.
};
/**************************************/
B5500CentralControl.prototype.powerOn = function() {
/* Powers up the system and establishes the hardware module configuration.
Redundant power-ons are ignored. */
if (!this.poweredUp) {
this.configureSystem();
this.poweredUp = 1;
}
};
/**************************************/
B5500CentralControl.prototype.powerOff = function() {
/* Powers down the system and deallocates the hardware modules.
Redundant power-offs are ignored. */
var x;
if (this.poweredUp) {
this.halt();
if (this.timer) {
clearTimeout(this.timer);
this.timer = null;
}
// Deallocate the system modules
this.P1 = this.P2 = null;
this.PA = null;
this.PB = null;
this.IO1 = null;
this.IO2 = null;
this.IO3 = null;
this.IO4 = null;
for (x=0; x<8; x++) {
this.memMod[x] = null;
this.addressSpace[x] = null;
}
this.poweredUp = 0;
}
};
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