mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-09-30 13:54:55 +00:00
666 lines
18 KiB
TypeScript
666 lines
18 KiB
TypeScript
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import { MOS6502, MOS6502State } from "../common/cpu/MOS6502";
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import { BasicMachine, RasterFrameBased, Bus, ProbeAll } from "../common/devices";
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import { KeyFlags, newAddressDecoder, padBytes, Keys, makeKeycodeMap, newKeyboardHandler, EmuHalt, dumpRAM } from "../common/emu";
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import { TssChannelAdapter, MasterAudio, POKEYDeviceChannel } from "../common/audio";
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import { hex, rgb2bgr } from "../common/util";
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// https://atarihq.com/danb/a7800.shtml
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// https://atarihq.com/danb/files/maria_r1.txt
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// https://sites.google.com/site/atari7800wiki/
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interface Atari7800StateBase {
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ram : Uint8Array;
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regs6532 : Uint8Array;
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}
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interface Atari7800ControlsState {
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inputs : Uint8Array;
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}
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interface Atari7800State extends Atari7800StateBase, Atari7800ControlsState {
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c : MOS6502State;
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tia : {
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regs : Uint8Array,
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};
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maria : {
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regs : Uint8Array,
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offset,dll,dlstart : number;
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dli,h16,h8 : boolean;
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};
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}
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const SWCHA = 0;
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const SWCHB = 2;
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const INPT0 = 8;
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const Atari7800_KEYCODE_MAP = makeKeycodeMap([
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[Keys.A, INPT0+0, 0x80],
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[Keys.B, INPT0+1, 0x80],
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[Keys.SELECT, SWCHB, -0x02],
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[Keys.START, SWCHB, -0x01],
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[Keys.UP, SWCHA, -0x10],
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[Keys.DOWN, SWCHA, -0x20],
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[Keys.LEFT, SWCHA, -0x40],
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[Keys.RIGHT, SWCHA, -0x80],
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[Keys.P2_A, INPT0+2, 0x80],
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[Keys.P2_B, INPT0+3, 0x80],
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//[Keys.P2_SELECT, 1, 2],
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//[Keys.P2_START, 1, 3],
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[Keys.P2_UP, SWCHA, -0x01],
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[Keys.P2_DOWN, SWCHA, -0x02],
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[Keys.P2_LEFT, SWCHA, -0x04],
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[Keys.P2_RIGHT, SWCHA, -0x08],
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]);
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// http://www.ataripreservation.org/websites/freddy.offenga/megazine/ISSUE5-PALNTSC.html
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// http://7800.8bitdev.org/index.php/7800_Software_Guide#APPENDIX_4:_FRAME_TIMING
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const CLK = 3579545;
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const linesPerFrame = 262;
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const numVisibleLines = 258-16;
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const colorClocksPerLine = 454; // 456?
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const colorClocksPreDMA = 28;
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const audioOversample = 4;
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const audioSampleRate = linesPerFrame*60*audioOversample;
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// TIA chip
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class TIA {
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regs = new Uint8Array(0x20);
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reset() {
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this.regs.fill(0);
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}
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read(a : number) : number {
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return this.regs[a] | 0;
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}
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write(a : number, v : number) {
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this.regs[a] = v;
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}
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saveState() {
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return {
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regs: this.regs.slice(0)
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};
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}
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loadState(s) {
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for (let i=0; i<32; i++)
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this.write(i, s.regs[i]);
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}
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static stateToLongString(state) : string {
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let s = "";
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s += dumpRAM(state.regs, 0, 32);
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return s;
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}
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}
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// MARIA chip
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class MARIA {
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bus : Bus;
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cycles : number = 0;
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regs = new Uint8Array(0x20);
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offset : number = -1;
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dll : number = 0;
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dlstart : number = 0;
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dli : boolean = false;
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h16 : boolean = false;
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h8 : boolean = false;
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pixels = new Uint8Array(320);
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WSYNC : number = 0;
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reset() {
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this.regs.fill(0);
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// TODO?
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}
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read(a : number) : number {
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return this.regs[a] | 0;
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}
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write(a : number, v : number) {
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this.regs[a] = v;
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if (a == 0x04) this.WSYNC++;
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//console.log(hex(a), '=', hex(v));
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}
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saveState() {
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return {
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regs: this.regs.slice(0),
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offset: this.offset,
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dll: this.dll,
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dlstart: this.dlstart,
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dli: this.dli,
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h16: this.h16,
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h8: this.h8,
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};
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}
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loadState(s) {
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for (let i=0; i<32; i++)
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this.write(i, s.regs[i]|0);
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this.offset = s.offset|0;
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this.dll = s.dll|0;
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this.dlstart = s.dlstart|0;
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this.dli = !!s.dli;
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this.h16 = !!s.h16;
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this.h8 = !!s.h8;
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}
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isDMAEnabled() {
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return (this.regs[0x1c] & 0x60) == 0x40;
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}
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getDLLStart() {
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return (this.regs[0x0c] << 8) + this.regs[0x10];
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}
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getCharBaseAddress() {
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return (this.regs[0x14] << 8) + this.offset;
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}
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setVBLANK(b : boolean) {
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if (b) {
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this.regs[0x08] |= 0x80;
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this.offset = -1;
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this.dll = this.getDLLStart();
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this.dli = this.bus && (this.bus.read(this.dll) & 0x80) != 0; // if DLI on first zone
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} else {
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this.regs[0x08] &= ~0x80;
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}
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}
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readDLLEntry(bus) {
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// display lists must be in RAM (TODO: probe?)
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if (this.dll >= 0x4000) { return; }
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let x = bus.read(this.dll);
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this.offset = (x & 0xf);
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this.h16 = (x & 0x40) != 0;
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this.h8 = (x & 0x20) != 0;
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this.dlstart = (bus.read(this.dll+1)<<8) + bus.read(this.dll+2);
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//console.log(hex(this.dll,4), this.offset, hex(this.dlstart,4));
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this.dll = (this.dll + 3) & 0xffff; // TODO: can also only cross 1 page?
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this.dli = (bus.read(this.dll) & 0x80) != 0; // DLI flag is from next DLL entry
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}
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isHoley(a : number) : boolean {
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if (a & 0x8000) {
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if (this.h16 && (a & 0x1000)) return true;
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if (this.h8 && (a & 0x800)) return true;
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}
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return false;
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}
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readDMA(a : number) : number {
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if (this.isHoley(a))
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return 0;
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else {
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this.cycles += 3;
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return this.bus.read(a);
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}
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}
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doDMA(bus : Bus) {
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this.bus = bus;
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this.cycles = 0;
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this.pixels.fill(this.regs[0x0]);
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if (this.isDMAEnabled()) {
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this.cycles += 16; // TODO: last line in zone gets additional 8 cycles
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// time for a new DLL entry?
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if (this.offset < 0) {
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this.readDLLEntry(bus);
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}
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// read the DL (only can span two pages)
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let dlhi = this.dlstart & 0xff00;
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let dlofs = this.dlstart & 0xff;
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do {
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// read DL entry
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let b0 = bus.read(dlhi + ((dlofs+0) & 0x1ff));
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let b1 = bus.read(dlhi + ((dlofs+1) & 0x1ff));
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if (b1 == 0) break; // end of DL
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// display lists must be in RAM (TODO: probe?)
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if (dlhi >= 0x4000) { break; }
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let b2 = bus.read(dlhi + ((dlofs+2) & 0x1ff));
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let b3 = bus.read(dlhi + ((dlofs+3) & 0x1ff));
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let indirect = false;
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// extended header?
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if ((b1 & 31) == 0) {
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var pal = b3 >> 5;
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var width = 32 - (b3 & 31);
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var xpos = bus.read(dlhi + ((dlofs+4) & 0x1ff));
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var writemode = b1 & 0x80;
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indirect = (b1 & 0x20) != 0;
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dlofs += 5;
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this.cycles += 10;
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} else {
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// direct mode
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var xpos = b3;
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var pal = b1 >> 5;
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var width = 32 - (b1 & 31);
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var writemode = 0;
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dlofs += 4;
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this.cycles += 8;
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}
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let gfxadr = b0 + (((b2 + (indirect?0:this.offset)) & 0xff) << 8);
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xpos *= 2;
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// copy graphics data (direct)
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let readmode = (this.regs[0x1c] & 0x3) + (writemode?4:0);
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// double bytes?
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let dbl = indirect && (this.regs[0x1c] & 0x10) != 0;
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if (dbl) { width *= 2; }
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//if (this.offset == 0) console.log(hex(dla,4), hex(gfxadr,4), xpos, width, pal, readmode);
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for (var i=0; i<width; i++) {
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let data = this.readDMA( dbl ? (gfxadr+(i>>1)) : (gfxadr+i) );
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if (indirect) {
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let indadr = ((this.regs[0x14] + this.offset) << 8) + data;
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if (dbl && (i&1)) {
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indadr++;
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this.cycles -= 3; // indirect read has 6/9 cycles
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}
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data = this.readDMA(indadr);
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}
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// TODO: more modes (https://github.com/gstanton/ProSystem1_3/blob/master/Core/Maria.cpp)
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switch (readmode) {
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case 0: // 160 A/B
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for (let j=0; j<4; j++) {
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var col = (data >> 6) & 3;
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if (col > 0) {
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this.pixels[xpos] = this.pixels[xpos+1] = this.regs[(pal<<2) + col];
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}
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data <<= 2;
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xpos = (xpos + 2) & 0x1ff;
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}
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break;
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case 2: // 320 B/D (TODO?)
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case 3: // 320 A/C
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for (let j=0; j<8; j++) {
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var col = (data & 128) ? 1 : 0;
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if (col > 0) {
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this.pixels[xpos] = this.regs[(pal<<2) + col];
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}
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data <<= 1;
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xpos = (xpos + 1) & 0x1ff;
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}
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break;
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}
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}
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} while (this.cycles < colorClocksPerLine); // TODO?
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// decrement offset
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this.offset -= 1;
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}
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return this.cycles;
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}
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doInterrupt() : boolean {
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if (this.dli && this.offset < 0) {
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this.dli = false;
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return true;
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} else
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return false;
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//return this.dli;// && this.offset == 1;
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}
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static stateToLongString(state) : string {
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let s = "";
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s += dumpRAM(state.regs, 0, 32);
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s += "\n DLL: $" + hex((state.regs[0x0c] << 8) + state.regs[0x10],4) + " @ $" + hex(state.dll,4);
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s += "\n DL: $" + hex(state.dlstart,4);
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s += "\nOffset: " + state.offset;
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s += "\n DLI? " + state.dli;
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return s;
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}
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}
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// Atari 7800
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export class Atari7800 extends BasicMachine implements RasterFrameBased {
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cpuFrequency = 1789772;
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canvasWidth = 320;
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numTotalScanlines = linesPerFrame;
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numVisibleScanlines = numVisibleLines;
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defaultROMSize = 0xc000;
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cpuCyclesPerLine = 113.5;
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sampleRate = audioSampleRate;
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cpu : MOS6502;
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ram : Uint8Array = new Uint8Array(0x1000);
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regs6532 = new Uint8Array(4);
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tia : TIA = new TIA();
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maria : MARIA = new MARIA();
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pokey1; //TODO: type
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audioadapter;
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lastFrameCycles = 0;
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xtracyc = 0;
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read : (a:number) => number;
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write : (a:number, v:number) => void;
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probeDMABus : Bus; // to pass to MARIA
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constructor() {
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super();
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this.cpu = new MOS6502();
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this.read = newAddressDecoder([
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[0x0008, 0x000d, 0x0f, (a) => { this.xtracyc++; return this.readInput(a); }],
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[0x0000, 0x001f, 0x1f, (a) => { this.xtracyc++; return this.tia.read(a); }],
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[0x0020, 0x003f, 0x1f, (a) => { return this.maria.read(a); }],
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[0x0040, 0x00ff, 0xff, (a) => { return this.ram[a + 0x800]; }],
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[0x0100, 0x013f, 0xff, (a) => { return this.read(a); }], // shadow
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[0x0140, 0x01ff, 0x1ff, (a) => { return this.ram[a + 0x800]; }],
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[0x0280, 0x02ff, 0x3, (a) => { this.xtracyc++; return this.inputs[a]; }],
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[0x1800, 0x27ff, 0xffff, (a) => { return this.ram[a - 0x1800]; }],
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[0x2800, 0x3fff, 0x7ff, (a) => { return this.read(a | 0x2000); }], // shadow
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[0x4000, 0xffff, 0xffff, (a) => { return this.rom ? this.rom[a - 0x4000] : 0; }],
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[0x0000, 0xffff, 0xffff, (a) => { return this.probe && this.probe.logIllegal(a); }],
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]);
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this.write = newAddressDecoder([
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[0x0015, 0x001A, 0x1f, (a,v) => { this.xtracyc++; this.pokey1.setTIARegister(a, v); }],
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[0x0000, 0x001f, 0x1f, (a,v) => { this.xtracyc++; this.tia.write(a,v); }],
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[0x0020, 0x003f, 0x1f, (a,v) => { this.maria.write(a,v); }],
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[0x0040, 0x00ff, 0xff, (a,v) => { this.ram[a + 0x800] = v; }],
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[0x0100, 0x013f, 0xff, (a,v) => { this.write(a,v); }], // shadow
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[0x0140, 0x01ff, 0x1ff, (a,v) => { this.ram[a + 0x800] = v; }],
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[0x0280, 0x02ff, 0x3, (a,v) => { this.xtracyc++; this.regs6532[a] = v; /*TODO*/ }],
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[0x1800, 0x27ff, 0xffff, (a,v) => { this.ram[a - 0x1800] = v; }],
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[0x2800, 0x3fff, 0x7ff, (a,v) => { this.write(a | 0x2000, v); }], // shadow
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[0xbfff, 0xbfff, 0xffff, (a,v) => { }], // TODO: bank switching?
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[0x0000, 0xffff, 0xffff, (a,v) => { this.probe && this.probe.logIllegal(a); }],
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]);
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this.connectCPUMemoryBus(this);
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this.probeDMABus = this.probeIOBus(this);
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this.handler = newKeyboardHandler(this.inputs, Atari7800_KEYCODE_MAP);
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this.pokey1 = new POKEYDeviceChannel();
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this.audioadapter = new TssChannelAdapter(this.pokey1, audioOversample, audioSampleRate);
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}
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readConst(a) {
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// make sure we don't log during this
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let oldprobe = this.probe;
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this.probe = null;
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let v = this.read(a);
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this.probe = oldprobe;
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return v;
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}
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readInput(a:number) : number {
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switch (a) {
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case 0xc: return ~this.inputs[0x8] & 0x80; //INPT4
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case 0xd: return ~this.inputs[0x9] & 0x80; //INPT5
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default: return this.inputs[a]|0;
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}
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}
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advanceCPU() : number {
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var clk = super.advanceCPU();
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if (this.xtracyc) {
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clk += this.xtracyc;
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this.probe.logClocks(this.xtracyc);
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this.xtracyc = 0;
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}
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return clk;
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}
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advanceFrame(trap) : number {
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var idata = this.pixels;
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var iofs = 0;
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var rgb;
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var mc = 0;
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var fc = 0;
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var steps = 0;
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this.probe.logNewFrame();
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//console.log(hex(this.cpu.getPC()), hex(this.maria.dll));
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// visible lines
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for (var sl=0; sl<linesPerFrame; sl++) {
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this.scanline = sl;
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var visible = sl < numVisibleLines;
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this.maria.setVBLANK(!visible);
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this.maria.WSYNC = 0;
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// pre-DMA clocks
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while (mc < colorClocksPreDMA) {
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if (this.maria.WSYNC) break;
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if (trap && trap()) {
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trap = null;
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sl = 999;
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break; // TODO?
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}
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mc += this.advanceCPU() << 2;
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steps++;
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}
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// is this scanline visible?
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if (visible) {
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// do DMA for scanline?
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let dmaClocks = this.maria.doDMA(this.probeDMABus);
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this.probe.logClocks(dmaClocks >> 2); // TODO: logDMA
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mc += dmaClocks;
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// copy line to frame buffer
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if (idata) {
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for (var i=0; i<320; i++) {
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idata[iofs++] = COLORS_RGBA[this.maria.pixels[i]];
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}
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}
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}
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// do interrupt? (if visible or before 1st scanline)
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if ((visible || sl == linesPerFrame-1) && this.maria.doInterrupt()) {
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this.probe.logInterrupt(0);
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this.cpu.NMI();
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}
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// post-DMA clocks
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while (mc < colorClocksPerLine) {
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if (this.maria.WSYNC) {
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this.probe.logClocks((colorClocksPerLine - mc) >> 2);
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mc = colorClocksPerLine;
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break;
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}
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if (trap && trap()) {
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trap = null;
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sl = 999;
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break;
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}
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mc += this.advanceCPU() << 2;
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steps++;
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}
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// audio
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this.audio && this.audioadapter.generate(this.audio);
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// update clocks, scanline
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|
mc -= colorClocksPerLine;
|
|
fc += mc;
|
|
this.probe.logNewScanline();
|
|
}
|
|
/*
|
|
// TODO let bkcol = this.maria.regs[0x0];
|
|
// TODO $(this.video.canvas).css('background-color', COLORS_WEB[bkcol]);
|
|
*/
|
|
this.lastFrameCycles = fc;
|
|
return steps;
|
|
}
|
|
|
|
getRasterX() { return this.lastFrameCycles % colorClocksPerLine; }
|
|
getRasterY() { return Math.floor(this.lastFrameCycles / colorClocksPerLine); }
|
|
|
|
loadROM(data) {
|
|
if (data.length == 0xc080) data = data.slice(0x80); // strip header
|
|
this.rom = padBytes(data, this.defaultROMSize, true);
|
|
}
|
|
|
|
reset() {
|
|
super.reset();
|
|
this.tia.reset();
|
|
this.maria.reset();
|
|
this.inputs.fill(0x0);
|
|
this.inputs[SWCHA] = 0xff;
|
|
this.inputs[SWCHB] = 1+2+8;
|
|
//this.cpu.advanceClock(); // needed for test to pass?
|
|
}
|
|
|
|
readAddress(addr : number) {
|
|
return this.read(addr) | 0;
|
|
}
|
|
|
|
loadState(state : Atari7800State) {
|
|
this.cpu.loadState(state.c);
|
|
this.ram.set(state.ram);
|
|
this.tia.loadState(state.tia);
|
|
this.maria.loadState(state.maria);
|
|
this.regs6532.set(state.regs6532);
|
|
this.loadControlsState(state);
|
|
}
|
|
saveState() : Atari7800State {
|
|
return {
|
|
c:this.cpu.saveState(),
|
|
ram:this.ram.slice(0),
|
|
tia:this.tia.saveState(),
|
|
maria:this.maria.saveState(),
|
|
regs6532:this.regs6532.slice(0),
|
|
inputs:this.inputs.slice(0)
|
|
};
|
|
}
|
|
loadControlsState(state:Atari7800ControlsState) : void {
|
|
this.inputs.set(state.inputs);
|
|
}
|
|
saveControlsState() : Atari7800ControlsState {
|
|
return {
|
|
inputs:this.inputs.slice(0)
|
|
};
|
|
}
|
|
|
|
getDebugCategories() {
|
|
return ['CPU','Stack','TIA','MARIA'];
|
|
}
|
|
getDebugInfo(category, state) {
|
|
switch (category) {
|
|
case 'TIA': return TIA.stateToLongString(state.tia);
|
|
case 'MARIA': return MARIA.stateToLongString(state.maria) + "\nScanline: " + this.scanline;
|
|
//default: return super.getDebugInfo(category, state);
|
|
}
|
|
}
|
|
}
|
|
|
|
///
|
|
|
|
const ATARI_NTSC_RGB = [
|
|
0x000000, // 00
|
|
0x404040, // 02
|
|
0x6c6c6c, // 04
|
|
0x909090, // 06
|
|
0xb0b0b0, // 08
|
|
0xc8c8c8, // 0A
|
|
0xdcdcdc, // 0C
|
|
0xf4f4f4, // 0E
|
|
0x004444, // 10
|
|
0x106464, // 12
|
|
0x248484, // 14
|
|
0x34a0a0, // 16
|
|
0x40b8b8, // 18
|
|
0x50d0d0, // 1A
|
|
0x5ce8e8, // 1C
|
|
0x68fcfc, // 1E
|
|
0x002870, // 20
|
|
0x144484, // 22
|
|
0x285c98, // 24
|
|
0x3c78ac, // 26
|
|
0x4c8cbc, // 28
|
|
0x5ca0cc, // 2A
|
|
0x68b4dc, // 2C
|
|
0x78c8ec, // 2E
|
|
0x001884, // 30
|
|
0x183498, // 32
|
|
0x3050ac, // 34
|
|
0x4868c0, // 36
|
|
0x5c80d0, // 38
|
|
0x7094e0, // 3A
|
|
0x80a8ec, // 3C
|
|
0x94bcfc, // 3E
|
|
0x000088, // 40
|
|
0x20209c, // 42
|
|
0x3c3cb0, // 44
|
|
0x5858c0, // 46
|
|
0x7070d0, // 48
|
|
0x8888e0, // 4A
|
|
0xa0a0ec, // 4C
|
|
0xb4b4fc, // 4E
|
|
0x5c0078, // 50
|
|
0x74208c, // 52
|
|
0x883ca0, // 54
|
|
0x9c58b0, // 56
|
|
0xb070c0, // 58
|
|
0xc084d0, // 5A
|
|
0xd09cdc, // 5C
|
|
0xe0b0ec, // 5E
|
|
0x780048, // 60
|
|
0x902060, // 62
|
|
0xa43c78, // 64
|
|
0xb8588c, // 66
|
|
0xcc70a0, // 68
|
|
0xdc84b4, // 6A
|
|
0xec9cc4, // 6C
|
|
0xfcb0d4, // 6E
|
|
0x840014, // 70
|
|
0x982030, // 72
|
|
0xac3c4c, // 74
|
|
0xc05868, // 76
|
|
0xd0707c, // 78
|
|
0xe08894, // 7A
|
|
0xeca0a8, // 7C
|
|
0xfcb4bc, // 7E
|
|
0x880000, // 80
|
|
0x9c201c, // 82
|
|
0xb04038, // 84
|
|
0xc05c50, // 86
|
|
0xd07468, // 88
|
|
0xe08c7c, // 8A
|
|
0xeca490, // 8C
|
|
0xfcb8a4, // 8E
|
|
0x7c1800, // 90
|
|
0x90381c, // 92
|
|
0xa85438, // 94
|
|
0xbc7050, // 96
|
|
0xcc8868, // 98
|
|
0xdc9c7c, // 9A
|
|
0xecb490, // 9C
|
|
0xfcc8a4, // 9E
|
|
0x5c2c00, // A0
|
|
0x784c1c, // A2
|
|
0x906838, // A4
|
|
0xac8450, // A6
|
|
0xc09c68, // A8
|
|
0xd4b47c, // AA
|
|
0xe8cc90, // AC
|
|
0xfce0a4, // AE
|
|
0x2c3c00, // B0
|
|
0x485c1c, // B2
|
|
0x647c38, // B4
|
|
0x809c50, // B6
|
|
0x94b468, // B8
|
|
0xacd07c, // BA
|
|
0xc0e490, // BC
|
|
0xd4fca4, // BE
|
|
0x003c00, // C0
|
|
0x205c20, // C2
|
|
0x407c40, // C4
|
|
0x5c9c5c, // C6
|
|
0x74b474, // C8
|
|
0x8cd08c, // CA
|
|
0xa4e4a4, // CC
|
|
0xb8fcb8, // CE
|
|
0x003814, // D0
|
|
0x1c5c34, // D2
|
|
0x387c50, // D4
|
|
0x50986c, // D6
|
|
0x68b484, // D8
|
|
0x7ccc9c, // DA
|
|
0x90e4b4, // DC
|
|
0xa4fcc8, // DE
|
|
0x00302c, // E0
|
|
0x1c504c, // E2
|
|
0x347068, // E4
|
|
0x4c8c84, // E6
|
|
0x64a89c, // E8
|
|
0x78c0b4, // EA
|
|
0x88d4cc, // EC
|
|
0x9cece0, // EE
|
|
0x002844, // F0
|
|
0x184864, // F2
|
|
0x306884, // F4
|
|
0x4484a0, // F6
|
|
0x589cb8, // F8
|
|
0x6cb4d0, // FA
|
|
0x7ccce8, // FC
|
|
0x8ce0fc // FE
|
|
];
|
|
|
|
var COLORS_RGBA = new Uint32Array(256);
|
|
var COLORS_WEB = [];
|
|
for (var i=0; i<256; i++) {
|
|
COLORS_RGBA[i] = ATARI_NTSC_RGB[i>>1] | 0xff000000;
|
|
COLORS_WEB[i] = "#"+hex(rgb2bgr(ATARI_NTSC_RGB[i>>1]),6);
|
|
}
|
|
|