diff --git a/modules/pc8080/lib/computer.js b/modules/pc8080/lib/computer.js index 39516e8b7..9b0b1199a 100644 --- a/modules/pc8080/lib/computer.js +++ b/modules/pc8080/lib/computer.js @@ -1471,17 +1471,17 @@ Computer8080.prototype.updateStatus = function(fForce) }; /** - * updateVideo(n) + * updateVideo(fForced) * * Any high-frequency updates should be performed here (avoid updating DOM elements). * * @this {Computer8080} - * @param {number} n (where 0 <= n < VIDEO_UPDATES_PER_SECOND for a normal update, or -1 for a forced update) + * @param {boolean} [fForced] */ -Computer8080.prototype.updateVideo = function(n) +Computer8080.prototype.updateVideo = function(fForced) { for (var i = 0; i < this.aVideo.length; i++) { - this.aVideo[i].updateScreen(n); + this.aVideo[i].updateScreen(fForced); } }; diff --git a/modules/pc8080/lib/cpu.js b/modules/pc8080/lib/cpu.js index 8367327fa..caf385648 100644 --- a/modules/pc8080/lib/cpu.js +++ b/modules/pc8080/lib/cpu.js @@ -43,8 +43,8 @@ if (NODE) { * * The CPU8080 class supports the following (parmsCPU) properties: * - * cycles: the machine's base cycles per second; the CPUState8080 constructor will - * provide us with a default (based on the CPU model) to use as a fallback. + * cycles: the machine's base cycles per second; the CPUState8080 constructor + * will provide us with a default (based on the CPU model) to use as a fallback. * * multiplier: base cycle multiplier; default is 1. * @@ -56,8 +56,8 @@ if (NODE) { * checksum records; -1 if disabled. checksum records are a diagnostic aid * used to help compare one CPU run to another. * - * csInterval: the number of cycles that runCPU() must execute before - * generating a checksum record; -1 if disabled. + * csInterval: the number of cycles that runCPU() must execute before generating + * a checksum record; -1 if disabled. * * csStop: the number of cycles to stop generating checksum records. * @@ -81,7 +81,6 @@ function CPU8080(parmsCPU, nCyclesDefault) this.counts = {}; this.counts.nCyclesPerSecond = nCycles; - this.counts.nVideoUpdates = 0; /* * nCyclesMultiplier replaces the old "speed" variable (0, 1, 2) and eliminates the need for @@ -141,20 +140,15 @@ Component.subclass(CPU8080); * calcCycles(), which uses the nCyclesPerSecond passed to the constructor as a starting * point and computes the following variables: * - * this.counts.nCyclesPerYield (this.counts.nCyclesPerSecond / CPU8080.YIELDS_PER_SECOND) - * this.counts.nCyclesPerVideoUpdate (this.counts.nCyclesPerSecond / CPU8080.VIDEO_UPDATES_PER_SECOND) - * this.counts.nCyclesPerStatusUpdate (this.counts.nCyclesPerSecond / CPU8080.STATUS_UPDATES_PER_SECOND) + * this.counts.nCyclesPerYield: (this.counts.nCyclesPerSecond / CPU8080.YIELDS_PER_SECOND) * * The above variables are also multiplied by any cycle multiplier in effect, via setSpeed(), * and then they're used to initialize another set of variables for each runCPU() iteration: * - * this.counts.nCyclesNextYield <= this.counts.nCyclesPerYield - * this.counts.nCyclesNextVideoUpdate <= this.counts.nCyclesPerVideoUpdate - * this.counts.nCyclesNextStatusUpdate <= this.counts.nCyclesPerStatusUpdate + * this.counts.nCyclesNextYield: this.counts.nCyclesPerYield */ -CPU8080.YIELDS_PER_SECOND = 30; -CPU8080.VIDEO_UPDATES_PER_SECOND = 60; -CPU8080.STATUS_UPDATES_PER_SECOND = 2; +CPU8080.YIELDS_PER_SECOND = 30; // just a gut feeling for the MINIMUM number of yields per second +CPU8080.YIELDS_PER_STATUS = 15; // every 15 yields (ie, twice per second), perform CPU status updates CPU8080.BUTTONS = ["power", "reset"]; @@ -178,12 +172,6 @@ CPU8080.prototype.initBus = function(cmp, bus, cpu, dbg) if (control) this.cmp.setBinding(null, CPU8080.BUTTONS[i], control); } - /* - * We need to know the refresh rate (and corresponding interrupt rate, if any) of the Video component. - */ - var video = /** @type {Video8080} */ (cmp.getMachineComponent("Video")); - this.refreshRate = video && video.getRefreshRate() || CPU8080.VIDEO_UPDATES_PER_SECOND; - /* * Attach the ChipSet component to the CPU so that it can be notified whenever the CPU stops and starts. */ @@ -207,7 +195,6 @@ CPU8080.prototype.initBus = function(cmp, bus, cpu, dbg) */ CPU8080.prototype.reset = function() { - this.counts.nVideoUpdates = 0; }; /** @@ -592,22 +579,12 @@ CPU8080.prototype.addCycles = function(nCycles, fEndStep) * calcCycles(fRecalc) * * Calculate the number of cycles to process for each "burst" of CPU activity. The size of a burst - * is driven by the following values: + * is driven by YIELDS_PER_SECOND (eg, 30). * - * CPU8080.YIELDS_PER_SECOND (eg, 30) - * CPU8080.VIDEO_UPDATES_PER_SECOND (eg, 60) - * CPU8080.STATUS_UPDATES_PER_SECOND (eg, 5) - * - * The largest of the above values forces the size of the burst to its smallest value. Let's say that - * largest value is 30. Assuming nCyclesPerSecond is 1,000,000, that results in bursts of 33,333 cycles. - * - * At the end of each burst, we subtract burst cycles from yield, video, and status cycle "threshold" - * counters. Whenever the "next yield" cycle counter goes to (or below) zero, we compare elapsed time - * to the time we expected the virtual hardware to take (eg, 1000ms/50 or 20ms), and if we still have time - * remaining, we sleep the remaining time (or 0ms if there's no remaining time), and then restart runCPU(). - * - * Similarly, whenever the "next video update" cycle counter goes to (or below) zero, we call updateVideo(), - * and whenever the "next status update" cycle counter goes to (or below) zero, we call updateStatus(). + * At the end of each burst, we subtract burst cycles from the yield cycle "threshold" counter. + * Whenever the "next yield" cycle counter goes to (or below) zero, we compare elapsed time to the time + * we expected the virtual hardware to take (eg, 1000ms/50 or 20ms), and if we still have time remaining, + * we sleep the remaining time (or 0ms if there's no remaining time), and then restart runCPU(). * * @this {CPU8080} * @param {boolean} [fRecalc] is true if the caller wants to recalculate thresholds based on the most recent @@ -616,14 +593,7 @@ CPU8080.prototype.addCycles = function(nCycles, fEndStep) CPU8080.prototype.calcCycles = function(fRecalc) { /* - * Calculate the most cycles we're allowed to execute in a single "burst" - */ - var nMostUpdatesPerSecond = CPU8080.YIELDS_PER_SECOND; - if (nMostUpdatesPerSecond < this.refreshRate) nMostUpdatesPerSecond = this.refreshRate; - if (nMostUpdatesPerSecond < CPU8080.STATUS_UPDATES_PER_SECOND) nMostUpdatesPerSecond = CPU8080.STATUS_UPDATES_PER_SECOND; - - /* - * Calculate cycle "per" values for the yield, video update, and status update cycle counters + * Calculate "per" yield values. */ var vMultiplier = 1; if (fRecalc) { @@ -633,18 +603,13 @@ CPU8080.prototype.calcCycles = function(fRecalc) } this.counts.msPerYield = Math.round(1000 / CPU8080.YIELDS_PER_SECOND); - this.counts.nCyclesPerBurst = Math.floor(this.counts.nCyclesPerSecond / nMostUpdatesPerSecond * vMultiplier); this.counts.nCyclesPerYield = Math.floor(this.counts.nCyclesPerSecond / CPU8080.YIELDS_PER_SECOND * vMultiplier); - this.counts.nCyclesPerVideoUpdate = Math.floor(this.counts.nCyclesPerSecond / this.refreshRate * vMultiplier); - this.counts.nCyclesPerStatusUpdate = Math.floor(this.counts.nCyclesPerSecond / CPU8080.STATUS_UPDATES_PER_SECOND * vMultiplier); /* - * And initialize "next" yield, video update, and status update cycle "threshold" counters to those "per" values + * And initialize "next" yield values to the "per" values. */ if (!fRecalc) { this.counts.nCyclesNextYield = this.counts.nCyclesPerYield; - this.counts.nCyclesNextVideoUpdate = this.counts.nCyclesPerVideoUpdate; - this.counts.nCyclesNextStatusUpdate = this.counts.nCyclesPerStatusUpdate; } this.counts.nCyclesRecalc = 0; }; @@ -718,6 +683,7 @@ CPU8080.prototype.getCyclesPerSecond = function() CPU8080.prototype.resetCycles = function() { this.counts.mhz = 0; + this.counts.nYieldsSinceStatusUpdate = 0; this.nTotalCycles = this.nRunCycles = this.nBurstCycles = this.nStepCycles = 0; this.resetChecksum(); this.setSpeed(1); @@ -1000,26 +966,26 @@ CPU8080.prototype.setTimer = function(iTimer, ms) { var nCycles = -1; if (iTimer >= 0 && iTimer < this.aTimers.length) { - nCycles = this.getCyclesMS(ms); + nCycles = this.getMSCycles(ms); this.aTimers[iTimer][0] = nCycles; } return nCycles; }; /** - * getCyclesMS(ms) + * getMSCycles(ms) * * @this {CPU8080} * @param {number} ms * @return {number} number of corresponding cycles */ -CPU8080.prototype.getCyclesMS = function(ms) +CPU8080.prototype.getMSCycles = function(ms) { return (this.counts.nCyclesPerSecond * this.counts.nCyclesMultiplier) / 1000 * ms; }; /** - * getCyclesBurst(nCycles) + * getBurstCycles(nCycles) * * Used by runCPU() to get min(nCycles,[timer cycle counts]) * @@ -1027,7 +993,7 @@ CPU8080.prototype.getCyclesMS = function(ms) * @param {number} nCycles (number of cycles about to execute) * @return {number} (either nCycles or less if a timer needs to fire) */ -CPU8080.prototype.getCyclesBurst = function(nCycles) +CPU8080.prototype.getBurstCycles = function(nCycles) { for (var i = this.aTimers.length - 1; i >= 0; i--) { var timer = this.aTimers[i]; @@ -1083,18 +1049,15 @@ CPU8080.prototype.runCPU = function(fUpdateFocus) * recalculates the the maximum number of cycles for each burst if the nCyclesRecalc threshold has been reached. */ this.calcStartTime(); + try { do { /* - * nCyclesPerBurst is how many cycles we WANT to run on each iteration of stepCPU(), but it may run - * significantly less (or slightly more, since we can't execute partial instructions). + * nCyclesPerBurst is how many cycles we WANT to run on each iteration of stepCPU(), and may + * be as HIGH as nCyclesPerYield, but it may be significantly less. getBurstCycles() will adjust + * nCyclesPerBurst downward if any CPU timers need to fire during the next burst. */ - var nCyclesPerBurst = (this.flags.fChecksum? 1 : this.counts.nCyclesPerBurst); - - /* - * Adjust nCyclesPerBurst if there are any CPU timers that need to fire within the current burst. - */ - nCyclesPerBurst = this.getCyclesBurst(nCyclesPerBurst); + var nCyclesPerBurst = this.getBurstCycles(this.flags.fChecksum? 1 : this.counts.nCyclesPerYield); /* * Execute the burst. @@ -1119,22 +1082,13 @@ CPU8080.prototype.runCPU = function(fUpdateFocus) this.addCycles(0, true); this.updateChecksum(nCycles); - this.counts.nCyclesNextVideoUpdate -= nCycles; - if (this.counts.nCyclesNextVideoUpdate <= 0) { - this.counts.nCyclesNextVideoUpdate += this.counts.nCyclesPerVideoUpdate; - if (this.cmp) this.cmp.updateVideo(this.counts.nVideoUpdates++); - if (this.counts.nVideoUpdates > this.refreshRate) this.counts.nVideoUpdates = 0; - } - - this.counts.nCyclesNextStatusUpdate -= nCycles; - if (this.counts.nCyclesNextStatusUpdate <= 0) { - this.counts.nCyclesNextStatusUpdate += this.counts.nCyclesPerStatusUpdate; - if (this.cmp) this.cmp.updateStatus(); - } - this.counts.nCyclesNextYield -= nCycles; if (this.counts.nCyclesNextYield <= 0) { this.counts.nCyclesNextYield += this.counts.nCyclesPerYield; + if (++this.counts.nYieldsSinceStatusUpdate >= CPU8080.YIELDS_PER_STATUS) { + if (this.cmp) this.cmp.updateStatus(); + this.counts.nYieldsSinceStatusUpdate = 0; + } break; } } while (this.flags.fRunning); @@ -1147,6 +1101,7 @@ CPU8080.prototype.runCPU = function(fUpdateFocus) this.setError(e.stack || e.message); return; } + setTimeout(this.onRunTimeout, this.calcRemainingTime()); }; @@ -1235,7 +1190,7 @@ CPU8080.prototype.stopCPU = function(fComplete) CPU8080.prototype.updateCPU = function(fForce) { if (this.cmp) { - this.cmp.updateVideo(-1); + this.cmp.updateVideo(fForce); this.cmp.updateStatus(fForce); } }; diff --git a/modules/pc8080/lib/debugger.js b/modules/pc8080/lib/debugger.js index 4c3f86ea1..b8bb7577a 100644 --- a/modules/pc8080/lib/debugger.js +++ b/modules/pc8080/lib/debugger.js @@ -3720,10 +3720,7 @@ if (DEBUGGER) { { if (DEBUG) { this.println("msPerYield: " + this.cpu.counts.msPerYield); - this.println("nCyclesPerBurst: " + this.cpu.counts.nCyclesPerBurst); this.println("nCyclesPerYield: " + this.cpu.counts.nCyclesPerYield); - this.println("nCyclesPerVideoUpdate: " + this.cpu.counts.nCyclesPerVideoUpdate); - this.println("nCyclesPerStatusUpdate: " + this.cpu.counts.nCyclesPerStatusUpdate); return true; } return false; diff --git a/modules/pc8080/lib/keyboard.js b/modules/pc8080/lib/keyboard.js index 195eb2825..22b5def73 100644 --- a/modules/pc8080/lib/keyboard.js +++ b/modules/pc8080/lib/keyboard.js @@ -922,11 +922,11 @@ Keyboard8080.prototype.isVT100TransmitterReady = function() { if (this.fVT100UARTBusy) { /* - * NOTE: getCyclesMS(1.2731488) should work out to 3520 cycles for a CPU clocked at 361.69ns per cycle, - * which is roughly 2.76Mhz. We could just hard-code 3520 instead of calling getCyclesMS(), but this helps + * NOTE: getMSCycles(1.2731488) should work out to 3520 cycles for a CPU clocked at 361.69ns per cycle, + * which is roughly 2.76Mhz. We could just hard-code 3520 instead of calling getMSCycles(), but this helps * maintain a reasonable blink rate for the cursor even when the user cranks up the CPU speed. */ - if (this.cpu.getCycles() >= this.nVT100UARTCycleSnap + this.cpu.getCyclesMS(1.2731488)) { + if (this.cpu.getCycles() >= this.nVT100UARTCycleSnap + this.cpu.getMSCycles(1.2731488)) { this.fVT100UARTBusy = false; } } diff --git a/modules/pc8080/lib/video.js b/modules/pc8080/lib/video.js index 713003350..19c99fd29 100644 --- a/modules/pc8080/lib/video.js +++ b/modules/pc8080/lib/video.js @@ -430,6 +430,13 @@ Video8080.prototype.initBus = function(cmp, bus, cpu, dbg) } } + var video = this; + this.timerUpdateNext = this.cpu.addTimer(function() { + video.updateScreen(); + }); + this.cpu.setTimer(this.timerUpdateNext, this.getRefreshTime()); + this.nUpdates = 0; + if (!this.sFontROM) this.setReady(); }; @@ -797,7 +804,7 @@ Video8080.prototype.updateScrollOffset = function(bScroll) * that update doesn't seem like a huge cause for concern. */ if (bScroll) { - this.updateScreen(-1); + this.updateScreen(true); } else { this.fSkipSingleCellUpdate = true; } @@ -902,14 +909,14 @@ Video8080.prototype.setFocus = function() }; /** - * getRefreshRate() + * getRefreshTime() * * @this {Video8080} * @return {number} */ -Video8080.prototype.getRefreshRate = function() +Video8080.prototype.getRefreshTime = function() { - return Math.max(this.rateRefresh, this.rateInterrupt); + return 1000 / Math.max(this.rateRefresh, this.rateInterrupt); }; /** @@ -1194,7 +1201,7 @@ Video8080.prototype.updateVT100 = function(fForced) }; /** - * updateScreen(n) + * updateScreen(fForced) * * Propagates the video buffer to the cell cache and updates the screen with any changes. Forced updates * are generally internal updates triggered by an I/O operation or other state change, while non-forced updates @@ -1205,22 +1212,20 @@ Video8080.prototype.updateVT100 = function(fForced) * invalid value, we're assured that the next call to updateScreen() will redraw the entire (visible) video buffer. * * @this {Video8080} - * @param {number} n (where 0 <= n < getRefreshRate() for a normal update, or -1 for a forced update) + * @param {boolean} [fForced] */ -Video8080.prototype.updateScreen = function(n) +Video8080.prototype.updateScreen = function(fForced) { var fClean; var fUpdate = true; - var fForced = true; - if (n >= 0) { - fForced = false; + if (!fForced) { if (this.rateInterrupt) { /* * TODO: Incorporate these hard-coded interrupt vector numbers into configuration blocks. */ if (this.rateInterrupt == 120) { - if (!(n & 1)) { + if (!(this.nUpdates & 1)) { /* * On even updates, call cpu.requestINTR(1), and also update our copy of the screen. */ @@ -1248,13 +1253,15 @@ Video8080.prototype.updateScreen = function(n) fUpdate = false; 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