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Added initial logic for decoding PDP-10 input-output instructions

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This commit is contained in:
Jeff 2017-03-04 16:47:56 -08:00 • committed by Jeff Parsons
commit 1ac769431f
7 changed files with 431 additions and 287 deletions
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68
modules/pdp10/lib/cpustate.js
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@ -176,7 +176,6 @@ class CPUStatePDP10 extends CPUPDP10 {
{
this.regEA = this.regRA = this.regOP = 0;
this.regPC = this.lastPC = this.addrReset;
this.fOverflow = this.fCarry0 = this.fCarry1 = this.fNoDivide = this.fPDOverflow = false;
/*
* This next internal reg is used only with byte instructions, to record an active byte
@ -184,6 +183,11 @@ class CPUStatePDP10 extends CPUPDP10 {
*/
this.regPS = -1;
/*
* Assorted processor flags
*/
this.fOverflow = this.fCarry0 = this.fCarry1 = this.fNoDivide = this.fPDOverflow = false;
/*
* This is queried and displayed by the Panel when it's not displaying its own ADDRESS register
* (which takes precedence when, for example, you've manually halted the CPU and are independently
@ -191,7 +195,7 @@ class CPUStatePDP10 extends CPUPDP10 {
*
* We initialize it to the current PC.
*/
this.lastAddr = this.regPC;
this.addrLast = this.regPC;
/*
* opFlags contains various conditions that stepCPU() needs to be aware of.
@ -285,12 +289,18 @@ class CPUStatePDP10 extends CPUPDP10 {
state.set(0, [
this.regEA,
this.regRA,
this.regPS,
this.regOP,
this.regPC,
this.regPS,
this.opFlags,
this.fOverflow,
this.fCarry0,
this.fCarry1,
this.fNoDivide,
this.fPDOverflow,
this.lastPC,
this.lastAddr,
this.opFlags
this.addrLast,
this.addrReset
]);
state.set(1, []);
state.set(2, [this.nTotalCycles, this.getSpeed(), this.flags.autoStart]);
@ -315,12 +325,18 @@ class CPUStatePDP10 extends CPUPDP10 {
[
this.regEA,
this.regRA,
this.regPS,
this.regOP,
this.regPC,
this.regPS,
this.opFlags,
this.fOverflow,
this.fCarry0,
this.fCarry1,
this.fNoDivide,
this.fPDOverflow,
this.lastPC,
this.lastAddr,
this.opFlags
this.addrLast,
this.addrReset
] = data[0];
var a = data[2];
@ -333,6 +349,36 @@ class CPUStatePDP10 extends CPUPDP10 {
return true;
}
/**
* readFlags()
*
* Used to implement the ""CONI APR," instruction; see opCONI().
*
* @this {CPUStatePDP10}
* @return {number}
*/
readFlags()
{
var flags = 0;
if (this.fOverflow) flags |= PDP10.RFLAG.OVFL;
if (this.fPDOverflow) flags |= PDP10.RFLAG.PDOVFL;
return flags;
}
/**
* writeFlags(w)
*
* Used to implement the ""CONO APR," instruction; see opCONO().
*
* @this {CPUStatePDP10}
* @param {number} w
*/
writeFlags(w)
{
if (w & PDP10.WFLAG.OVFL_CL) this.fOverflow = false;
if (w & PDP10.WFLAG.PDOVFL_CL) this.fPDOverflow = false;
}
/**
* getOpcode()
*
@ -417,7 +463,7 @@ class CPUStatePDP10 extends CPUPDP10 {
*/
getLastAddr()
{
return this.lastAddr;
return this.addrLast;
}
/**
@ -758,7 +804,7 @@ class CPUStatePDP10 extends CPUPDP10 {
*/
readWordFromPhysical(addr)
{
return this.bus.getWord(this.lastAddr = addr);
return this.bus.getWord(this.addrLast = addr);
}
/**
@ -773,7 +819,7 @@ class CPUStatePDP10 extends CPUPDP10 {
*/
writeWordToPhysical(addr, data)
{
this.bus.setWord(this.lastAddr = addr, data);
this.bus.setWord(this.addrLast = addr, data);
return data;
}