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pkimpel.retro-b5500/emulator/B5500CentralControl.js
paul 6664f3f99a Commit DCMCP transcription as of 2012-09-15; commit initial attempt 
at a test file loader.
2012-09-15 22:23:00 +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.P1 = 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];
// Instance variables and flags
this.poweredUp = 0; // System power indicator
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.rtcTick = 1000/60; // Real-time clock period, milliseconds
B5500CentralControl.pow2 = [ // powers of 2 from 0 to 52
1, 2, 4, 8,
16, 32, 64, 128,
256, 512, 1024, 2048,
4096, 8192, 16384, 32768,
65536, 131072, 262144, 524288,
1048576, 2097152, 4194304, 8388608,
16777216, 33554432, 67108864, 134217728,
268435456, 536870912, 1073741824, 2147483648,
4294967296, 8589934592, 17179869184, 34359738368,
68719476736, 137438953472, 274877906944, 549755813888,
1099511627776, 2199023255552, 4398046511104, 8796093022208,
17592186044416, 35184372088832, 70368744177664, 140737488355328,
281474976710656, 562949953421312, 1125899906842624, 2251799813685248,
4503599627370496];
B5500CentralControl.mask2 = [ // (2**n)-1 for n from 0 to 52
0, 1, 3, 7,
15, 31, 63, 127,
255, 511, 1023, 2047,
4095, 8191, 16383, 32767,
65535, 131071, 262143, 524287,
1048575, 2097151, 4194303, 8388607,
16777215, 33554431, 67108863, 134217727,
268435455, 536870911, 1073741823, 2147483647,
4294967295, 8589934591, 17179869183, 34359738367,
68719476735, 137438953471, 274877906943, 549755813887,
1099511627775, 2199023255551, 4398046511103, 8796093022207,
17592186044415, 35184372088831, 70368744177663, 140737488355327,
281474976710655, 562949953421311, 1125899906842623, 2251799813685247,
4503599627370495];
/**************************************/
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 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
(bit == 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-vstart; // 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
(bit == 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 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(r, addr, word) {
/* 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.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.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; // 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;
break;
case 0x18: // @30: I/O 2 finished
this.CCI09F = 0;
break;
case 0x19: // @31: I/O 3 finished
this.CCI10F = 0;
break;
case 0x1A: // @32: I/O 4 finished
this.CCI11F = 0;
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
p2.I &= 0xFE;
break;
case 0x21: // @41: P2 invalid address error
p2.I &= 0xFD;
break;
case 0x22: // @42: P2 stack overflow
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:
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;
that.CCI03F = 1; // set timer interrupt
// inhibit for now // that.signalInterrupt();
}
interval = (that.nextTimeStamp += B5500CentralControl.rtcTick) - thisTime;
that.timer = setTimeout(function() {that.tock()}, (interval < 0 ? 1 : interval));
};
/**************************************/
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. */
var p2 = this.P2;
if (!this.P2 || this.P2BF) {
this.CCI12F = 1; // set P2 busy interrupt
this.signalInterrupt();
} else {
p2.M = 8; // Now have P2 pick up the INCW
p2.access(0x04); // A = [M]
p2.AROF = 1;
p2.T = 0x849; // inject 4111=IP1 into P2's T register
p2.TROF = 1;
p2.NCSF = 0; // make sure P2 is in control state
this.P2BF = 1;
this.HP2F = 0;
// Now start scheduling P2 on the Javascript thread
p2.procTime = new Date().getTime()*1000;
p2.scheduler = setTimeout(p2.schedule, 0);
}
};
/**************************************/
B5500CentralControl.prototype.initiateIO = function() {
/* Selects an I/O unit and initiates an I/O */
if (this.IO1) {
this.AD1F = 1;
this.IO1.initiate();
} else if (this.IO2) {
this.AD2F = 1;
this.IO2.initiate();
} else if (this.IO3) {
this.AD3F = 1;
this.IO3.initiate();
} else if (this.IO4) {
this.AD4F = 1;
this.IO4.initiate();
} else {
this.CCI04F = 1; // set I/O busy interrupt
this.signalInterrupt();
}
};
/**************************************/
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.load = function() {
/* Initiates a Load operation to start the system */
if ((this.PA && this.PA.busy) || (this.PB && this.PB.busy)) {
this.clear();
if (this.P1) {
this.LOFF = 1;
if (this.IO1) { // !! not sure about I/O selection here
this.IO1.initiateLoad(this.cardLoadSelect);
this.loadComplete();
}
}
}
};
/**************************************/
B5500CentralControl.prototype.loadComplete = function loadComplete() {
/* Monitors an initial load I/O operation for complete status.
When complete, initiates P1 */
var that = loadComplete.that; // capture the current closure context
if (!that.CCI08F) {
that.loadTimer = setTimeout(that.loadComplete, 100);
} else {
that.loadTimer = null;
that.LOFF = 0;
that.P1.C = 0x10; // execute from address @20
that.P1.access(0x30); // P = [C]
that.P1.T = that.fieldIsolate(that.P, 0, 12);
that.P1.TROF = 1;
that.P1.L = 1; // advance L to the next syllable
// Now start scheduling P1 on the Javascript thread
that.P1.procTime = new Date().getTime()*1000;
that.P1.scheduler = setTimeout(that.P1.schedule, 0);
}
};
/**************************************/
B5500CentralControl.prototype.configureSystem = function() {
/* Establishes the hardware module configuration from the
B5500SystemConfiguration module */
var cfg = B5500SystemConfiguration;
var x;
// !! inhibit for now // this.DD = new B5500DistributionAndDisplay();
if (cfg.PA) {this.PA = new B5500Processor("A")};
if (cfg.PB) {this.PB = new B5500Processor("B")};
this.PB1L = (cfg.PB1L ? 1 : 0);
/*** enable once I/O exists ***
if (cfg.IO1) {this.IO1 = new B5500IOUnit("1")};
if (cfg.IO2) {this.IO2 = new B5500IOUnit("2")};
if (cfg.IO3) {this.IO3 = new B5500IOUnit("3")};
if (cfg.IO4) {this.IO4 = new B5500IOUnit("4")};
***/
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]);
}
}
// 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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