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astrocade: added wait states

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This commit is contained in:
Steven Hugg 2019-12-02 23:53:55 -06:00
parent 9305fbe2af
commit b95bdfc7e7
1 changed files with 25 additions and 19 deletions
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44
src/machine/astrocade.ts
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@ -9,6 +9,7 @@ import { hex, rgb2bgr, lzgmini, stringToByteArray } from "../common/util";
// TODO: fix keys, more controllers, vibrato/noise, border color, debug info, rotate
// http://atariage.com/forums/topic/251416-programming-the-bally-arcadeastrocade/
// https://ballyalley.com/faqs/BPA%20Video%20Hardware%20FAQ/Bally_Professional_Arcade_Video_Hardware%20(2001)(Tony%20Miller).pdf
const ASTROCADE_KEYCODE_MAP = makeKeycodeMap([
// player 1
@ -90,11 +91,13 @@ const _BallyAstrocade = function(arcade:boolean) {
var rotdata = new Uint8Array(4);
var rotcount = 0;
var intst = 0;
var waitstates = 0;
function ramwrite(a: number, v: number) {
// set RAM
ram[a] = v;
waitstates++;
// mark scanline as dirty
dirtylines[((a & 0xfff) / swbytes) | 0] = 1;
// this was old behavior where we updated instantly
@ -228,18 +231,15 @@ const _BallyAstrocade = function(arcade:boolean) {
read: newAddressDecoder([
[0x0000, 0x1fff, 0x1fff, function(a) { return bios[a]; }],
[0x2000, 0x3fff, 0x1fff, function(a) { return rom ? rom[a] : 0; }],
[0x4000, 0x4fff, 0xfff, function(a) { return ram[a]; }],
[0x4000, 0x4fff, 0xfff, function(a) { waitstates++; return ram[a]; }],
]),
write: newAddressDecoder([
[0x4000, 0x4fff, 0xfff, ramwrite],
[0x0000, 0x3fff, 0xfff, magicwrite],
]),
// TODO: correct values?
//isContended: () => { return true; },
//contend: (addr: number) => { return vidactive && addr >= 0x4000 ? 1 : 0; },
}
} else {
// arcade game
// arcade game (TODO: wait states 1/4 of the time)
membus = {
read: newAddressDecoder([
[0x4000, 0x7fff, 0x3fff, function(a) { return ram[a]; }], // screen RAM
@ -251,8 +251,6 @@ const _BallyAstrocade = function(arcade:boolean) {
[0xd000, 0xdfff, 0xfff, function(a, v) { ramwrite(a + 0x4000, v); }], // static RAM
[0x0000, 0x3fff, 0x3fff, magicwrite],
]),
//isContended: () => { return true; },
//TODO: contend: (addr: number) => { return vidactive ? 1 : 0; },
}
}
iobus = {
@ -347,6 +345,12 @@ const _BallyAstrocade = function(arcade:boolean) {
}
};
this.resetWaitStates = function(sl) {
var n = sl < verbl ? waitstates : 0; // only wait if video active
waitstates = 0;
return n;
}
this.loadState = (state) => {
cpu.loadState(state.c);
ram.set(state.ram);
@ -479,6 +483,9 @@ export class BallyAstrocade extends BasicScanlineMachine implements AcceptsPaddl
this.backbuffer = new Uint32Array(pixels.length);
this.m.connectVideo(this.backbuffer);
}
preFrame() {
this.m.resetWaitStates(0);
}
postFrame() {
// copy back buffer to front buffer, omitting bottom non-visible pixels
var nbytes = this.m.getVisiblePixelWords();
@ -498,17 +505,6 @@ export class BallyAstrocade extends BasicScanlineMachine implements AcceptsPaddl
drawScanline() {
var sl = this.scanline;
// double scanlines in consumer mode
//for (var i = 0; i < 2; i++) {
/*
// TODO: simulate contention during visible part of scanline
vidactive = sl < verbl;
extra = this.advance(this.cpuCyclesPerVisible - extra);
vidactive = false;
extra = this.advance(this.cpuCyclesPerHBlank - extra);
this.scanline++;
}
*/
this.m.drawScanline(sl);
/*
if (watchdog_counter-- <= 0) {
@ -517,7 +513,17 @@ export class BallyAstrocade extends BasicScanlineMachine implements AcceptsPaddl
}
*/
}
advanceCPU() {
var clk = super.advanceCPU();
// TODO: disable 33% of the time (hblank)
var xtra = this.m.resetWaitStates(this.scanline);
if (xtra) {
clk += xtra;
this.probe.logClocks(xtra);
}
return clk;
}
loadROM(data) {
super.loadROM(data);