"use strict"; import { Platform, BaseZ80Platform, getToolForFilename_z80 } from "../baseplatform"; import { PLATFORMS, RAM, newAddressDecoder, padBytes, noise, setKeyboardFromMap, AnimationTimer, RasterVideo, Keys, makeKeycodeMap } from "../emu"; import { hex, lzgmini, stringToByteArray } from "../util"; import { MasterAudio, SN76489_Audio } from "../audio"; import { TMS9918A } from "../video/tms9918a"; // https://www.konamiman.com/msx/msx-e.html#msx2th // https://www.msx.org/wiki/MSX_Cartridge_slot // http://map.grauw.nl/resources/msx_io_ports.php // https://openmsx.org/manual/setup.html // https://www.msx.org/wiki/Slots // https://www.msx.org/wiki/SDCC var MSX_PRESETS = [ {id:'helloworld.asm', name:'Hello World (ASM)'}, ]; var MSX_KEYCODE_MAP = makeKeycodeMap([ [Keys.VK_UP, 0, 0x1], [Keys.VK_DOWN, 0, 0x4], [Keys.VK_LEFT, 0, 0x8], [Keys.VK_RIGHT, 0, 0x2], [Keys.VK_SPACE, 0, 0x40], [Keys.VK_CONTROL, 1, 0x40], [Keys.VK_W, 2, 0x1], [Keys.VK_S, 2, 0x4], [Keys.VK_A, 2, 0x8], [Keys.VK_D, 2, 0x2], [Keys.VK_Z, 2, 0x40], [Keys.VK_X, 3, 0x40], ]); /// standard emulator const _MSXPlatform = function(mainElement) { const cpuFrequency = 3579545; // MHz const canvasWidth = 304; const numTotalScanlines = 262; const numVisibleScanlines = 240; const cpuCyclesPerLine = Math.round(cpuFrequency / 60 / numTotalScanlines); var cpu, ram, membus, iobus, rom, bios; var video, vdp, timer; var audio, psg; var inputs = new Uint8Array(4); var slotmask = 0; var slots : MSXSlot[]; interface MSXSlot { read(addr:number) : number; write(addr:number, val:number) : void; } class MSXPlatform extends BaseZ80Platform implements Platform { getPresets() { return MSX_PRESETS; } start() { ram = new RAM(0x10000); bios = new lzgmini().decode(stringToByteArray(atob(MSX1_BIOS_LZG))); slots = [ // slot 0 : BIOS { read: (a) => { return bios[a] | 0; }, write: (a,v) => { } }, // slot 1: cartridge { read: (a) => { return rom[a] | 0; }, write: (a,v) => { } }, // slot 2 : empty null, // slot 3 : RAM { read: (a) => { return ram[a] | 0; }, write: (a,v) => { ram[a] = v; } }, ]; // slot mapper membus = { read: (a) => { let shift = (a >> 14) << 1; let slotnum = (slotmask >> shift) & 3; let slot = slots[slotnum]; return slot ? slot.read(a) : 0; }, write: (a,v) => { let shift = (a >> 14) << 1; let slotnum = (slotmask >> shift) & 3; let slot = slots[slotnum]; if (slot) slot.write(a, v); }, isContended: function() { return false; }, }; iobus = { read: function(addr) { addr &= 0xff; //console.log('IO read', hex(addr,4)); switch (addr) { case 0x98: return vdp.readData(); case 0x99: return vdp.readStatus(); case 0xa8: return slotmask; } return 0; }, write: function(addr, val) { addr &= 0xff; val &= 0xff; //console.log('IO write', hex(addr,4), hex(val,2)); switch (addr) { case 0x98: vdp.writeData(val); break; case 0x99: vdp.writeAddress(val); break; case 0xa8: slotmask = val; break; } } }; cpu = this.newCPU(membus, iobus); video = new RasterVideo(mainElement,canvasWidth,numVisibleScanlines); video.create(); audio = new MasterAudio(); psg = new SN76489_Audio(audio); var cru = { setVDPInterrupt: (b) => { if (b) { cpu.nonMaskableInterrupt(); } else { // TODO: reset interrupt? } } }; vdp = new TMS9918A(video.canvas, cru, false); setKeyboardFromMap(video, inputs, MSX_KEYCODE_MAP); timer = new AnimationTimer(60, this.nextFrame.bind(this)); } readAddress(addr) { return membus.read(addr); } advance(novideo : boolean) { for (var sl=0; sl