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Fixed the frequency of PDP-11 display updates

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This commit is contained in:
Jeff 2016-11-07 18:30:33 -08:00 • committed by Jeff Parsons
commit a88e2d7b39
7 changed files with 274 additions and 255 deletions
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19
modules/pdp11/lib/device.js
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@ -122,7 +122,7 @@ DevicePDP11.prototype.initBus = function(cmp, bus, cpu, dbg)
var device = this;
this.kw11.timer = cpu.addTimer(function() {
device.kw11_interrupt();
device.interruptKW11();
});
this.kw11.trigger = cpu.addTrigger(PDP11.KW11.VEC, PDP11.KW11.PRI);
@ -141,21 +141,28 @@ DevicePDP11.prototype.initBus = function(cmp, bus, cpu, dbg)
DevicePDP11.prototype.reset = function()
{
this.kw11.lks = 0;
this.cpu.setTimer(this.kw11.timer, 1000/60, true);
};
/**
* kw11_interrupt()
* interruptKW11()
*
* We used to call this function only when the the KW11's "Interrupt Enable" bit was set,
* but now we call it at 60Hz regardless. In part, this was so we could piggy-back on
* it to drive display updates, but more importantly, the KW11's "Monitor" bit is supposed
* to be set at the "line frequency" independent of whether KW11 interrupts are enabled.
* So we should actually be more compatible now.
*
* @this {DevicePDP11}
*/
DevicePDP11.prototype.kw11_interrupt = function()
DevicePDP11.prototype.interruptKW11 = function()
{
this.kw11.lks |= PDP11.KW11.LKS.MON;
if (this.kw11.lks & PDP11.KW11.LKS.IE) {
this.cpu.setTrigger(this.kw11.trigger);
this.cpu.setTimer(this.kw11.timer, 1000/60);
}
if (this.cmp) this.cmp.updateDisplays(1);
this.cpu.setTimer(this.kw11.timer, 1000/60);
};
/**
@ -181,10 +188,6 @@ DevicePDP11.prototype.readLKS = function(addr)
*/
DevicePDP11.prototype.writeLKS = function(data, addr)
{
this.kw11.lks = data;
if (data & PDP11.KW11.LKS.IE) {
this.cpu.setTimer(this.kw11.timer, 1000/60);
}
this.kw11.lks = data & ~PDP11.KW11.LKS.MON;
};