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First cut at PDP-10 byte instructions

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Jeff 2017-03-02 23:10:24 -08:00 • committed by Jeff Parsons
commit 25aa95cec8
7 changed files with 396 additions and 276 deletions
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12
modules/pdp10/lib/cpustate.js
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@ -178,6 +178,12 @@ class CPUStatePDP10 extends CPUPDP10 {
this.regPC = this.lastPC = this.addrReset;
this.fOverflow = this.fCarry0 = this.fCarry1 = this.fNoDivide = this.fPDOverflow = false;
/*
* This next two internal regs are used only with byte instructions, to record an active byte
* pointer state (regPS) and pointer address (regPA).
*/
this.regPS = this.regPA = -1;
/*
* 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
@ -279,6 +285,8 @@ class CPUStatePDP10 extends CPUPDP10 {
state.set(0, [
this.regEA,
this.regRA,
this.regPS,
this.regPA,
this.regOP,
this.regPC,
this.lastPC,
@ -308,6 +316,8 @@ class CPUStatePDP10 extends CPUPDP10 {
[
this.regEA,
this.regRA,
this.regPS,
this.regPA,
this.regOP,
this.regPC,
this.lastPC,
@ -369,7 +379,7 @@ class CPUStatePDP10 extends CPUPDP10 {
if (this.regRA & PDP10.OPCODE.I_BIT) return -1;
this.regPC = (this.regPC + 1) % PDP10.ADDR_LIMIT;
return (this.regOP / PDP10.OPCODE.ACSHIFT)|0;
return (this.regOP / PDP10.OPCODE.A_SCALE)|0;
}
/**