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VT100 video buffer bias fixed

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This commit is contained in:
Jeff Parsons 2016-08-02 18:53:01 -07:00 • committed by Jeff Parsons
commit e82a1d5b52
3 changed files with 29 additions and 36 deletions
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25
modules/pc8080/lib/chipset.js
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@ -194,6 +194,9 @@ ChipSet.VT100 = {
DC011: { // generates Line Buffer Addresses (LBAs) for the Video Processor
PORT: 0xC2, // write-only
INIT: 0x00
},
LBA: { // used to simulate LBA0 through LBA7 (LBA7 is used to drive NVR_CLK)
INIT: 0x00
}
};
@ -312,7 +315,8 @@ ChipSet.VT100.init = [
ChipSet.VT100.NVR_LATCH.INIT,
ChipSet.VT100.FLAGS_BUFFER.NO_AVO | ChipSet.VT100.FLAGS_BUFFER.NO_GFX,
ChipSet.VT100.DC012.INIT,
ChipSet.VT100.DC011.INIT
ChipSet.VT100.DC011.INIT,
ChipSet.VT100.LBA.INIT
]
];
@ -344,7 +348,7 @@ ChipSet.prototype.save = function()
state.set(0, [this.bStatus0, this.bStatus1, this.bStatus2, this.wShiftData, this.bShiftCount, this.bSound1, this.bSound2]);
break;
case ChipSet.VT100.MODEL:
state.set(0, [this.bBrightnessLatch, this.bNVRLatch]);
state.set(0, [this.bBrightnessLatch, this.bNVRLatch, this.bFlagsBuffer, this.bDC012, this.bDC011, this.bLBA]);
break;
}
return state.data();
@ -379,6 +383,7 @@ ChipSet.prototype.restore = function(data)
this.bFlagsBuffer = a[2];
this.bDC012 = a[3];
this.bDC011 = a[4];
this.bLBA = a[5];
return true;
}
}
@ -413,19 +418,6 @@ ChipSet.prototype.stop = function()
*/
};
/**
* isVideoEnabled()
*
* TODO: Consider moving this and the related ports (ie, DC011 and DC012) into the Video component.
*
* @this {ChipSet}
* @return {boolean}
*/
ChipSet.prototype.isVideoEnabled = function()
{
return this.model != ChipSet.VT100.MODEL || this.bDC011 != 0;
};
/**
* updateStatus0(bit, fSet)
*
@ -604,7 +596,8 @@ ChipSet.prototype.outSIWatchdog = function(port, b, addrFrom)
*/
ChipSet.prototype.inVT100FlagsBuffer = function(port, addrFrom)
{
var b = this.bFlagsBuffer;
this.bLBA++;
var b = this.bFlagsBuffer = (this.bFlagsBuffer & ~ChipSet.VT100.FLAGS_BUFFER.NVR_CLK) | ((this.bLBA & 0x80)? ChipSet.VT100.FLAGS_BUFFER.NVR_CLK : 0);
this.printMessageIO(port, null, addrFrom, "FLAGS.BUFFER", b, true);
return b;
};