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Added Debugger "int" command to manually request interrupts

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This commit is contained in:
Jeff Parsons 2016-08-06 13:39:46 -07:00
commit 276c36334e
11 changed files with 1328 additions and 44 deletions
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35
modules/pc8080/lib/chipset.js
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@ -205,7 +205,8 @@ ChipSet.VT100 = {
ERASE: 0x5,
READ: 0x6,
STANDBY: 0x7
}
},
WORDMASK: 0x3fff // NVR words are 14-bit
},
DC012: { // generates scan counts for the Video Processor
PORT: 0xA2, // write-only
@ -678,11 +679,11 @@ ChipSet.prototype.getNVRAddr = function()
};
/**
* advanceNVR()
* doNVRCommand()
*/
ChipSet.prototype.advanceNVR = function()
ChipSet.prototype.doNVRCommand = function()
{
var addr;
var addr, data;
var bit = this.bNVRLatch & 0x1;
var bCmd = (this.bNVRLatch >> 1) & 0x7;
@ -696,7 +697,8 @@ ChipSet.prototype.advanceNVR = function()
case ChipSet.VT100.NVR.CMD.ERASE:
addr = this.getNVRAddr();
this.aNVRWords[addr] = 0x3fff;
this.aNVRWords[addr] = ChipSet.VT100.NVR.WORDMASK;
this.printMessage("doNVRCommand(): erase data at addr " + str.toHexWord(addr));
break;
case ChipSet.VT100.NVR.CMD.ACCEPT_DATA:
@ -705,17 +707,32 @@ ChipSet.prototype.advanceNVR = function()
case ChipSet.VT100.NVR.CMD.WRITE:
addr = this.getNVRAddr();
this.aNVRWords[addr] = this.wNVRData & 0x3fff;
data = this.wNVRData & ChipSet.VT100.NVR.WORDMASK;
this.aNVRWords[addr] = data;
this.printMessage("doNVRCommand(): write data " + str.toHexWord(data) + " to addr " + str.toHexWord(addr));
break;
case ChipSet.VT100.NVR.CMD.READ:
addr = this.getNVRAddr();
this.wNVRData = this.aNVRWords[addr];
data = this.aNVRWords[addr];
/*
* Since we don't explicitly initialize aNVRWords[], we pretend any uninitialized words contains WORDMASK.
*/
if (data == null) data = ChipSet.VT100.NVR.WORDMASK;
this.wNVRData = data;
this.printMessage("doNVRCommand(): read data " + str.toHexWord(data) + " from addr " + str.toHexWord(addr));
break;
case ChipSet.VT100.NVR.CMD.SHIFT_OUT:
this.bNVROut = this.wNVRData & 0x2000;
this.wNVRData <<= 1;
/*
* Since WORDMASK is 0x3fff, this will mask the shifted data with 0x4000, which is the bit we want to isolate.
*/
this.bNVROut = this.wNVRData & (ChipSet.VT100.NVR.WORDMASK + 1);
break;
default:
this.printMessage("doNVRCommand(): unrecognized command " + str.toHexByte(bCmd));
break;
}
};
@ -738,7 +755,7 @@ ChipSet.prototype.inVT100FlagsBuffer = function(port, addrFrom)
if (this.getVT100LBA(7)) {
b |= ChipSet.VT100.FLAGS_BUFFER.NVR_CLK;
if (b != this.bFlagsBuffer) {
this.advanceNVR();
this.doNVRCommand();
}
}
b &= ~ChipSet.VT100.FLAGS_BUFFER.NVR_DATA;