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Prevent display updates until DC011 starts generating LBAs (Line Buffer Addresses)

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This commit is contained in:
Jeff Parsons 2016-08-02 17:06:13 -07:00 • committed by Jeff Parsons
commit 5f048a0688
3 changed files with 103 additions and 12 deletions
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2
.editorconfig
View file

@ -12,7 +12,7 @@ indent_style = space
indent_size = 8
trim_trailing_whitespace = true
[*.{ASM,INC,MAC,NASM,LST,asm,inc,mac,nasm,lst}]
[*.{ASM,INC,MAC,NASM,LST,asm,inc,mac,nasm,lst,d80}]
indent_style = tab
indent_size = 8
trim_trailing_whitespace = true

97
modules/pc8080/lib/chipset.js
View file

@ -168,11 +168,32 @@ ChipSet.SI1978 = {
ChipSet.VT100 = {
MODEL: 100.0,
FLAGS_BUFFER: {
PORT: 0x42, // read-only
XMIT: 0x01, // active if SET
NO_AVO: 0x02, // AVO present if CLEAR
NO_GFX: 0x04, // VT125 graphics board present if CLEAR
OPTION: 0x08, // OPTION present if SET
NO_EVEN: 0x10, // EVEN FIELD active if CLEAR
NVR_DATA: 0x20, // NVR DATA if SET
NVR_CLK: 0x40, // NVR CLOCK if SET
KBD_XMIT: 0x80 // KBD XMIT BUFFER empty if SET
},
BRIGHTNESS_LATCH: {
PORT: 0x42 // write-only
PORT: 0x42, // write-only
INIT: 0x00
},
NVR_LATCH: {
PORT: 0x62 // write-only
PORT: 0x62, // write-only
INIT: 0x00
},
DC012: { // write-only
PORT: 0xA2,
INIT: 0x00
},
DC011: { // write-only
PORT: 0xC2,
INIT: 0x00
}
};
@ -287,7 +308,11 @@ ChipSet.SI1978.init = [
ChipSet.VT100.init = [
[
0, 0
ChipSet.VT100.BRIGHTNESS_LATCH.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
]
];
@ -351,6 +376,9 @@ ChipSet.prototype.restore = function(data)
case ChipSet.VT100.MODEL:
this.bBrightnessLatch = a[0];
this.bNVRLatch = a[1];
this.bFlagsBuffer = a[2];
this.bDC012 = a[3];
this.bDC011 = a[4];
return true;
}
}
@ -385,6 +413,19 @@ 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)
*
@ -553,6 +594,21 @@ ChipSet.prototype.outSIWatchdog = function(port, b, addrFrom)
this.printMessageIO(port, b, addrFrom, "WATCHDOG", null, true);
};
/**
* inVT100FlagsBuffer(port, addrFrom)
*
* @this {ChipSet}
* @param {number} port (0x42)
* @param {number} [addrFrom] (not defined if the Debugger is trying to read the specified port)
* @return {number} simulated port value
*/
ChipSet.prototype.inVT100FlagsBuffer = function(port, addrFrom)
{
var b = this.bFlagsBuffer;
this.printMessageIO(port, null, addrFrom, "FLAGS.BUFFER", b, true);
return b;
};
/**
* outVT100BrightnessLatch(port, b, addrFrom)
*
@ -568,7 +624,7 @@ ChipSet.prototype.outVT100BrightnessLatch = function(port, b, addrFrom)
};
/**
* outVT100BrightnessLatch(port, b, addrFrom)
* outVT100NVRLatch(port, b, addrFrom)
*
* @this {ChipSet}
* @param {number} port (0x62)
@ -581,6 +637,34 @@ ChipSet.prototype.outVT100NVRLatch = function(port, b, addrFrom)
this.bNVRLatch = b;
};
/**
* outVT100DC012(port, b, addrFrom)
*
* @this {ChipSet}
* @param {number} port (0xA2)
* @param {number} b
* @param {number} [addrFrom] (not defined if the Debugger is trying to write the specified port)
*/
ChipSet.prototype.outVT100DC012 = function(port, b, addrFrom)
{
this.printMessageIO(port, b, addrFrom, "DC012", null, true);
this.bDC012 = b;
};
/**
* outVT100DC011(port, b, addrFrom)
*
* @this {ChipSet}
* @param {number} port (0xC2)
* @param {number} b
* @param {number} [addrFrom] (not defined if the Debugger is trying to write the specified port)
*/
ChipSet.prototype.outVT100DC011 = function(port, b, addrFrom)
{
this.printMessageIO(port, b, addrFrom, "DC011", null, true);
this.bDC011 = b;
};
/*
* Port notification tables
*/
@ -600,11 +684,14 @@ ChipSet.SI1978.portsOutput = {
};
ChipSet.VT100.portsInput = {
0x42: ChipSet.prototype.inVT100FlagsBuffer
};
ChipSet.VT100.portsOutput = {
0x42: ChipSet.prototype.outVT100BrightnessLatch,
0x62: ChipSet.prototype.outVT100NVRLatch
0x62: ChipSet.prototype.outVT100NVRLatch,
0xA2: ChipSet.prototype.outVT100DC012,
0xC2: ChipSet.prototype.outVT100DC011
};
/**

16
modules/pc8080/lib/video.js
View file

@ -392,12 +392,10 @@ Video.prototype.initBus = function(cmp, bus, cpu, dbg)
this.bus = bus;
this.cpu = cpu;
this.dbg = dbg;
this.chipset = cmp.getMachineComponent("ChipSet");
if (!this.nFormat) {
this.chipset = cmp.getMachineComponent("ChipSet");
if (this.chipset && this.chipset.model == ChipSet.SI1978.MODEL) {
this.nFormat = Video.FORMAT.SI1978;
}
if (!this.nFormat && this.chipset && this.chipset.model == ChipSet.SI1978.MODEL) {
this.nFormat = Video.FORMAT.SI1978;
}
/*
@ -655,6 +653,10 @@ Video.prototype.powerUp = function(data, fRepower)
this.bus.setByteDirect(addr++, Video.VT100.LINETERM);
addrNext = addr;
}
/*
* NOTE: By calling updateVT100() directly, we are bypassing the normal checks (eg, isVideoEnabled())
*/
this.updateVT100();
}
return true;
};
@ -1088,7 +1090,9 @@ Video.prototype.updateScreen = function(n)
this.printMessage("updateScreen(" + n + "): clean=" + fClean + ", update=" + fUpdate + ", cycles=" + nCycles + ", delta=" + nCyclesDelta);
}
if (!fUpdate) return;
if (!fUpdate || this.chipset && !this.chipset.isVideoEnabled()) {
return;
}
if (this.cxCell > 1) {
this.updateScreenText();