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Implemented my first 4 PDP-10 opcodes (HLL, HLLI, HLLM, HLLS)

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Jeff Parsons 2017-02-26 10:51:49 -08:00 • committed by Jeff Parsons
commit ed4c031035
6 changed files with 1428 additions and 1371 deletions
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16
modules/pdp10/lib/cpustate.js
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@ -174,6 +174,7 @@ class CPUStatePDP10 extends CPUPDP10 {
*/
initCPU()
{
this.regOP = 0;
this.regEA = 0;
this.regPC = this.lastPC = this.addrReset;
@ -276,6 +277,7 @@ class CPUStatePDP10 extends CPUPDP10 {
{
var state = new State(this);
state.set(0, [
this.regOP,
this.regEA,
this.regPC,
this.lastPC,
@ -303,6 +305,7 @@ class CPUStatePDP10 extends CPUPDP10 {
* of what save() does when it collects a bunch of object properties into an array.
*/
[
this.regOP,
this.regEA,
this.regPC,
this.lastPC,
@ -324,8 +327,7 @@ class CPUStatePDP10 extends CPUPDP10 {
* getOpcode()
*
* This fetches the next opcode, decodes the low 23 bits (I,X,Y), sets regEA, and returns the
* the high 18 bits for further decoding. While it's true that, in general, only the high 13 bits
* are relevant to the operation, it's cleaner to treat the original opcode as two half-words.
* the high 13 bits for further decoding.
*
* @this {CPUStatePDP10}
* @return {number}
@ -333,9 +335,9 @@ class CPUStatePDP10 extends CPUPDP10 {
getOpcode()
{
var pc = this.lastPC = this.regPC;
var opCode = this.readWord(pc);
var r = this.regOP = this.readWord(pc);
this.regPC = (pc + 1) % PDP10.ADDR_LIMIT;
var e, x, r = opCode, nMaxIndirect = 4;
var e, x, nMaxIndirect = 4;
while (true) {
/*
* Bits 0-22 (I,X,Y) contain what we call a "reference address" (R), which is used to calculate the
@ -360,7 +362,7 @@ class CPUStatePDP10 extends CPUPDP10 {
r = this.readWord(e);
}
this.regEA = e;
return (opCode / PDP10.ADDR_LIMIT)|0;
return (this.regOP / PDP10.OPCODE.ACSHIFT)|0;
}
/**
@ -807,8 +809,8 @@ class CPUStatePDP10 extends CPUPDP10 {
this.opFlags &= PDP10.OPFLAG.PRESERVE;
var opCode = this.getOpcode();
this.opDecode(opCode);
var op = this.getOpcode();
this.opDecode(op);
} while (this.nStepCycles > 0);