Apple-2-Tools
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apple2js
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apple2js/js/mmu.ts

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import CPU6502 from './cpu6502';
import RAM, { RAMState } from './ram';
import ROM, { ROMState } from './roms/rom';
import { debug } from './util';
import { byte, Memory, Restorable } from './types';
import Apple2IO from './apple2io';
import { HiresPage, LoresPage, VideoModes } from './videomodes';
/*
* I/O Switch locations
*/
const LOC = {
// 80 Column memory
_80STOREOFF: 0x00,
_80STOREON: 0x01,
// Aux RAM
RAMRDOFF: 0x02,
RAMRDON: 0x03,
RAMWROFF: 0x04,
RAMWRON: 0x05,
// Bank switched ROM
INTCXROMOFF: 0x06,
INTCXROMON: 0x07,
ALTZPOFF: 0x08,
ALTZPON: 0x09,
SLOTC3ROMOFF: 0x0A,
SLOTC3ROMON: 0x0B,
// 80 Column video
CLR80VID: 0x0C, // clear 80 column mode
SET80VID: 0x0D, // set 80 column mode
CLRALTCH: 0x0E, // clear mousetext
SETALTCH: 0x0F, // set mousetext
// Status
BSRBANK2: 0x11,
BSRREADRAM: 0x12,
RAMRD: 0x13,
RAMWRT: 0x14,
INTCXROM: 0x15,
ALTZP: 0x16,
SLOTC3ROM: 0x17,
_80STORE: 0x18,
VERTBLANK: 0x19,
RDTEXT: 0x1A, // using text mode
RDMIXED: 0x1B, // using mixed mode
RDPAGE2: 0x1C, // using text/graphics page2
RDHIRES: 0x1D, // using Hi-res graphics mode
RDALTCH: 0x1E, // using alternate character set
RD80VID: 0x1F, // using 80-column display mode
// Graphics
PAGE1: 0x54, // select text/graphics page1 main/aux
PAGE2: 0x55, // select text/graphics page2 main/aux
RESET_HIRES: 0x56,
SET_HIRES: 0x57,
DHIRESON: 0x5E, // Enable double hires (CLRAN3)
DHIRESOFF: 0x5F, // Disable double hires (SETAN3)
// Misc
BANK: 0x73, // Back switched RAM card bank
IOUDISON: 0x7E, // W IOU Disable on / R7 IOU Disable
IOUDISOFF: 0x7F, // W IOU Disable off / R7 Double Hires
// Language Card
// Bank 2
READBSR2: 0x80,
WRITEBSR2: 0x81,
OFFBSR2: 0x82,
READWRBSR2: 0x83,
// Bank 1
READBSR1: 0x88,
WRITEBSR1: 0x89,
OFFBSR1: 0x8a,
READWRBSR1: 0x8b,
};
class Switches implements Memory {
constructor(private mmu: MMU) {}
read(_page: byte, off: byte) {
return this.mmu._access(off) || 0;
}
write(_page: byte, off: byte, val: byte) {
this.mmu._access(off, val);
}
}
class AuxRom implements Memory {
constructor(
private readonly mmu: MMU,
private readonly rom: ROM) { }
_access(page: byte, off: byte) {
if (page == 0xc3) {
this.mmu._setIntc8rom(true);
this.mmu._updateBanks();
}
if (page == 0xcf && off == 0xff) {
this.mmu._setIntc8rom(false);
this.mmu._updateBanks();
}
}
read(page: byte, off: byte) {
this._access(page, off);
return this.rom.read(page, off);
}
write(page: byte, off: byte, _val: byte) {
this._access(page, off);
}
}
export interface MMUState {
bank1: boolean
readbsr: boolean
writebsr: boolean
prewrite: boolean
intcxrom: boolean
slot3rom: boolean
intc8rom: boolean
auxRamRead: boolean
auxRamWrite: boolean
altzp: boolean
_80store: boolean
page2: boolean
hires: boolean
mem00_01: [RAMState, RAMState]
mem02_03: [RAMState, RAMState]
mem0C_1F: [RAMState, RAMState]
mem60_BF: [RAMState, RAMState]
memD0_DF: [ROMState, RAMState, RAMState, RAMState, RAMState]
memE0_FF: [ROMState, RAMState, RAMState]
}
export default class MMU implements Memory, Restorable<MMUState> {
private _readPages = new Array<Memory>(0x100);
private _writePages = new Array<Memory>(0x100);
private _pages = new Array<Memory[]>(0x100);
// Language Card RAM Softswitches
private _bank1: boolean;
private _readbsr: boolean;
private _writebsr: boolean;
private _prewrite: boolean;
// Auxillary ROM
private _intcxrom: boolean;
private _slot3rom: boolean;
private _intc8rom: boolean;
// Auxillary RAM
private _auxRamRead: boolean;
private _auxRamWrite: boolean;
private _altzp: boolean;
// Video
private _80store: boolean;
private _page2: boolean;
private _hires: boolean;
private _iouDisable: boolean;
private _vbEnd = 0;
private switches = new Switches(this);
private auxRom = new AuxRom(this, this.rom);
// These fields represent the bank-switched memory ranges.
private mem00_01 = [new RAM(0x0, 0x1), new RAM(0x0, 0x1)];
private mem02_03 = [new RAM(0x2, 0x3), new RAM(0x2, 0x3)];
private mem04_07 = [this.lores1.bank0(), this.lores1.bank1()];
private mem08_0B = [this.lores2.bank0(), this.lores2.bank1()];
private mem0C_1F = [new RAM(0xC, 0x1F), new RAM(0xC, 0x1F)];
private mem20_3F = [this.hires1.bank0(), this.hires1.bank1()];
private mem40_5F = [this.hires2.bank0(), this.hires2.bank1()];
private mem60_BF = [new RAM(0x60, 0xBF), new RAM(0x60, 0xBF)];
private memC0_C0 = [this.switches];
private memC1_CF = [this.io, this.auxRom];
private memD0_DF: [ROM, RAM, RAM, RAM, RAM] = [
this.rom,
new RAM(0xD0, 0xDF), new RAM(0xD0, 0xDF),
new RAM(0xD0, 0xDF), new RAM(0xD0, 0xDF)
];
private memE0_FF: [ROM, RAM, RAM] = [
this.rom,
new RAM(0xE0, 0xFF), new RAM(0xE0, 0xFF)
];
constructor(
private readonly cpu: CPU6502,
private readonly vm: VideoModes,
private readonly lores1: LoresPage,
private readonly lores2: LoresPage,
private readonly hires1: HiresPage,
private readonly hires2: HiresPage,
private readonly io: Apple2IO,
private readonly rom: ROM) {
/*
* Initialize read/write banks
*/
// Zero Page/Stack
for (let idx = 0x0; idx < 0x2; idx++) {
this._pages[idx] = this.mem00_01;
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
// 0x300-0x400
for (let idx = 0x2; idx < 0x4; idx++) {
this._pages[idx] = this.mem02_03;
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
// Text Page 1
for (let idx = 0x4; idx < 0x8; idx++) {
this._pages[idx] = this.mem04_07;
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
// Text Page 2
for (let idx = 0x8; idx < 0xC; idx++) {
this._pages[idx] = this.mem08_0B;
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
// 0xC00-0x2000
for (let idx = 0xC; idx < 0x20; idx++) {
this._pages[idx] = this.mem0C_1F;
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
// Hires Page 1
for (let idx = 0x20; idx < 0x40; idx++) {
this._pages[idx] = this.mem20_3F;
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
// Hires Page 2
for (let idx = 0x40; idx < 0x60; idx++) {
this._pages[idx] = this.mem40_5F;
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
// 0x6000-0xc000
for (let idx = 0x60; idx < 0xc0; idx++) {
this._pages[idx] = this.mem60_BF;
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
// I/O Switches
{
const idx = 0xc0;
this._pages[idx] = this.memC0_C0;
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
// Slots
for (let idx = 0xc1; idx < 0xd0; idx++) {
this._pages[idx] = this.memC1_CF;
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
// Basic ROM
for (let idx = 0xd0; idx < 0xe0; idx++) {
this._pages[idx] = this.memD0_DF;
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
// Monitor ROM
for (let idx = 0xe0; idx < 0x100; idx++) {
this._pages[idx] = this.memE0_FF;
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
}
_initSwitches() {
this._bank1 = false;
this._readbsr = false;
this._writebsr = false;
this._prewrite = false;
this._auxRamRead = false;
this._auxRamWrite = false;
this._altzp = false;
this._intcxrom = false;
this._slot3rom = false;
this._intc8rom = false;
this._80store = false;
this._page2 = false;
this._hires = false;
this._iouDisable = true;
}
_debug(..._args: any[]) {
// debug.apply(this, _args);
}
_setIntc8rom(on: boolean) {
this._intc8rom = on;
}
_updateBanks() {
if (this._auxRamRead) {
for (let idx = 0x02; idx < 0xC0; idx++) {
this._readPages[idx] = this._pages[idx][1];
}
} else {
for (let idx = 0x02; idx < 0xC0; idx++) {
this._readPages[idx] = this._pages[idx][0];
}
}
if (this._auxRamWrite) {
for (let idx = 0x02; idx < 0xC0; idx++) {
this._writePages[idx] = this._pages[idx][1];
}
} else {
for (let idx = 0x02; idx < 0xC0; idx++) {
this._writePages[idx] = this._pages[idx][0];
}
}
if (this._80store) {
if (this._page2) {
for (let idx = 0x4; idx < 0x8; idx++) {
this._readPages[idx] = this._pages[idx][1];
this._writePages[idx] = this._pages[idx][1];
}
if (this._hires) {
for (let idx = 0x20; idx < 0x40; idx++) {
this._readPages[idx] = this._pages[idx][1];
this._writePages[idx] = this._pages[idx][1];
}
}
} else {
for (let idx = 0x4; idx < 0x8; idx++) {
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
if (this._hires) {
for (let idx = 0x20; idx < 0x40; idx++) {
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
}
}
}
if (this._intcxrom) {
for (let idx = 0xc1; idx < 0xd0; idx++) {
this._readPages[idx] = this._pages[idx][1];
this._writePages[idx] = this._pages[idx][1];
}
} else {
for (let idx = 0xc1; idx < 0xd0; idx++) {
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
if (!this._slot3rom) {
this._readPages[0xc3] = this._pages[0xc3][1];
this._writePages[0xc3] = this._pages[0xc3][1];
}
if (this._intc8rom) {
for (let idx = 0xc8; idx < 0xd0; idx++) {
this._readPages[idx] = this._pages[idx][1];
this._writePages[idx] = this._pages[idx][1];
}
}
}
if (this._altzp) {
for (let idx = 0x0; idx < 0x2; idx++) {
this._readPages[idx] = this._pages[idx][1];
this._writePages[idx] = this._pages[idx][1];
}
} else {
for (let idx = 0x0; idx < 0x2; idx++) {
this._readPages[idx] = this._pages[idx][0];
this._writePages[idx] = this._pages[idx][0];
}
}
if (this._readbsr) {
if (this._bank1) {
for (let idx = 0xd0; idx < 0xe0; idx++) {
this._readPages[idx] = this._pages[idx][this._altzp ? 2 : 1];
}
} else {
for (let idx = 0xd0; idx < 0xe0; idx++) {
this._readPages[idx] = this._pages[idx][this._altzp ? 4 : 3];
}
}
for (let idx = 0xe0; idx < 0x100; idx++) {
this._readPages[idx] = this._pages[idx][this._altzp ? 2 : 1];
}
} else {
for (let idx = 0xd0; idx < 0x100; idx++) {
this._readPages[idx] = this._pages[idx][0];
}
}
if (this._writebsr) {
if (this._bank1) {
for (let idx = 0xd0; idx < 0xe0; idx++) {
this._writePages[idx] = this._pages[idx][this._altzp ? 2 : 1];
}
} else {
for (let idx = 0xd0; idx < 0xe0; idx++) {
this._writePages[idx] = this._pages[idx][this._altzp ? 4 : 3];
}
}
for (let idx = 0xe0; idx < 0x100; idx++) {
this._writePages[idx] = this._pages[idx][this._altzp ? 2 : 1];
}
} else {
for (let idx = 0xd0; idx < 0x100; idx++) {
this._writePages[idx] = this._pages[idx][0];
}
}
}
// Apple //e memory management
_accessMMUSet(off: byte, _val?: byte) {
switch (off) {
case LOC._80STOREOFF:
this._80store = false;
this._debug('80 Store Off', _val);
this.vm.page(this._page2 ? 2 : 1);
break;
case LOC._80STOREON:
this._80store = true;
this._debug('80 Store On', _val);
break;
case LOC.RAMRDOFF:
this._auxRamRead = false;
this._debug('Aux RAM Read Off');
break;
case LOC.RAMRDON:
this._auxRamRead = true;
this._debug('Aux RAM Read On');
break;
case LOC.RAMWROFF:
this._auxRamWrite = false;
this._debug('Aux RAM Write Off');
break;
case LOC.RAMWRON:
this._auxRamWrite = true;
this._debug('Aux RAM Write On');
break;
case LOC.INTCXROMOFF:
this._intcxrom = false;
if (this._slot3rom) {
this._intc8rom = false;
}
this._debug('Int CX ROM Off');
break;
case LOC.INTCXROMON:
this._intcxrom = true;
this._debug('Int CX ROM On');
break;
case LOC.ALTZPOFF: // 0x08
this._altzp = false;
this._debug('Alt ZP Off');
break;
case LOC.ALTZPON: // 0x09
this._altzp = true;
this._debug('Alt ZP On');
break;
case LOC.SLOTC3ROMOFF: // 0x0A
this._slot3rom = false;
this._debug('Slot 3 ROM Off');
break;
case LOC.SLOTC3ROMON: // 0x0B
this._slot3rom = true;
this._debug('Slot 3 ROM On');
break;
// Graphics Switches
case LOC.CLR80VID:
this._debug('80 Column Mode off');
this.vm._80col(false);
break;
case LOC.SET80VID:
this._debug('80 Column Mode on');
this.vm._80col(true);
break;
case LOC.CLRALTCH:
this._debug('Alt Char off');
this.vm.altChar(false);
break;
case LOC.SETALTCH:
this._debug('Alt Char on');
this.vm.altChar(true);
break;
}
this._updateBanks();
}
// Status registers
_accessStatus(off: byte, val?: byte) {
let result = undefined;
switch(off) {
case LOC.BSRBANK2:
this._debug('Bank 2 Read ' + !this._bank1);
result = !this._bank1 ? 0x80 : 0x00;
break;
case LOC.BSRREADRAM:
this._debug('Bank SW RAM Read ' + this._readbsr);
result = this._readbsr ? 0x80 : 0x00;
break;
case LOC.RAMRD: // 0xC013
this._debug('Aux RAM Read ' + this._auxRamRead);
result = this._auxRamRead ? 0x80 : 0x0;
break;
case LOC.RAMWRT: // 0xC014
this._debug('Aux RAM Write ' + this._auxRamWrite);
result = this._auxRamWrite ? 0x80 : 0x0;
break;
case LOC.INTCXROM: // 0xC015
// _debug('Int CX ROM ' + _intcxrom);
result = this._intcxrom ? 0x80 : 0x00;
break;
case LOC.ALTZP: // 0xC016
this._debug('Alt ZP ' + this._altzp);
result = this._altzp ? 0x80 : 0x0;
break;
case LOC.SLOTC3ROM: // 0xC017
this._debug('Slot C3 ROM ' + this._slot3rom);
result = this._slot3rom ? 0x80 : 0x00;
break;
case LOC._80STORE: // 0xC018
this._debug('80 Store ' + this._80store);
result = this._80store ? 0x80 : 0x00;
break;
case LOC.VERTBLANK: // 0xC019
// result = cpu.getCycles() % 20 < 5 ? 0x80 : 0x00;
result = (this.cpu.getCycles() < this._vbEnd) ? 0x80 : 0x00;
break;
case LOC.RDTEXT:
result = this.vm.isText() ? 0x80 : 0x0;
break;
case LOC.RDMIXED:
result = this.vm.isMixed() ? 0x80 : 0x0;
break;
case LOC.RDPAGE2:
result = this._page2 ? 0x80 : 0x0;
break;
case LOC.RDHIRES:
result = this.vm.isHires() ? 0x80 : 0x0;
break;
case LOC.RD80VID:
result = this.vm.is80Col() ? 0x80 : 0x0;
break;
case LOC.RDALTCH:
result = this.vm.isAltChar() ? 0x80 : 0x0;
break;
default:
result = this.io.ioSwitch(off, val);
}
return result;
}
_accessIOUDisable(off: byte, val?: byte) {
const writeMode = val !== undefined;
let result;
switch (off) {
case LOC.IOUDISON:
if (writeMode) {
this._iouDisable = true;
} else {
result = this._iouDisable ? 0x00 : 0x80;
}
break;
case LOC.IOUDISOFF:
if (writeMode) {
this._iouDisable = false;
} else {
result = this.vm.isDoubleHires() ? 0x80 : 0x00;
}
break;
default:
result = this.io.ioSwitch(off, val);
}
return result;
}
_accessGraphics(off: byte, val?: byte) {
let result: byte | undefined = 0;
switch (off) {
case LOC.PAGE1:
this._page2 = false;
if (!this._80store) {
result = this.io.ioSwitch(off, val);
}
this._debug('Page 2 off');
break;
case LOC.PAGE2:
this._page2 = true;
if (!this._80store) {
result = this.io.ioSwitch(off, val);
}
this._debug('Page 2 on');
break;
case LOC.RESET_HIRES:
this._hires = false;
result = this.io.ioSwitch(off, val);
this._debug('Hires off');
break;
case LOC.DHIRESON:
if (this._iouDisable) {
this.vm.doubleHires(true);
} else {
result = this.io.ioSwitch(off, val); // an3
}
break;
case LOC.DHIRESOFF:
if (this._iouDisable) {
this.vm.doubleHires(false);
} else {
result = this.io.ioSwitch(off, val); // an3
}
break;
case LOC.SET_HIRES:
this._hires = true;
result = this.io.ioSwitch(off, val);
this._debug('Hires on');
break;
default:
result = this.io.ioSwitch(off, val);
break;
}
this._updateBanks();
return result;
}
_accessLangCard(off: byte, val?: byte) {
const readMode = val === undefined;
const result = readMode ? 0 : undefined;
const writeSwitch = off & 0x01;
const offSwitch = off & 0x02;
const bank1Switch = off & 0x08;
let bankStr;
let rwStr;
if (writeSwitch) { // 0xC081, 0xC083
if (readMode) {
this._writebsr = this._prewrite;
}
this._prewrite = readMode;
if (offSwitch) { // 0xC08B
this._readbsr = true;
rwStr = 'Read/Write';
} else {
this._readbsr = false;
rwStr = 'Write';
}
} else { // 0xC080, 0xC082
this._writebsr = false;
this._prewrite = false;
if (offSwitch) { // 0xC082
this._readbsr = false;
rwStr = 'Off';
} else { // 0xC080
this._readbsr = true;
rwStr = 'Read';
}
}
if (bank1Switch) {
this._bank1 = true;
bankStr = 'Bank 1';
} else {
this._bank1 = false;
bankStr = 'Bank 2';
}
this._debug(bankStr, rwStr);
this._updateBanks();
return result;
}
/*
* The Big Switch
*/
_access(off: byte, val?: byte) {
let result;
const writeMode = val !== undefined;
const highNibble = off >> 4;
switch (highNibble) {
case 0x0:
if (writeMode) {
this._accessMMUSet(off, val);
} else {
result = this.io.ioSwitch(off);
}
break;
case 0x1:
if (writeMode) {
this.io.ioSwitch(off, val);
} else {
result = this._accessStatus(off, val);
}
break;
case 0x5:
result = this._accessGraphics(off, val);
break;
case 0x7:
result = this._accessIOUDisable(off, val);
break;
case 0x8:
result = this._accessLangCard(off, val);
break;
default:
result = this.io.ioSwitch(off, val);
}
return result;
}
public start() {
this.lores1.start();
this.lores2.start();
return 0x00;
}
public end() {
return 0xff;
}
public reset() {
debug('reset');
this._initSwitches();
this._updateBanks();
this.vm.reset();
this.io.reset();
}
public read(page: byte, off: byte) {
return this._readPages[page].read(page, off);
}
public write(page: byte, off: byte, val: byte) {
this._writePages[page].write(page, off, val);
}
public writeBank(bank: number,page: byte, off: byte, val: byte) {
this._pages[page][bank].write(page, off, val);
}
public resetVB() {
this._vbEnd = this.cpu.getCycles() + 1000;
}
public getState(): MMUState {
return {
bank1: this._bank1,
readbsr: this._readbsr,
writebsr: this._writebsr,
prewrite: this._prewrite,
intcxrom: this._intcxrom,
slot3rom: this._slot3rom,
intc8rom: this._intc8rom,
auxRamRead: this._auxRamRead,
auxRamWrite: this._auxRamWrite,
altzp: this._altzp,
_80store: this._80store,
page2: this._page2,
hires: this._hires,
mem00_01: [this.mem00_01[0].getState(), this.mem00_01[1].getState()],
mem02_03: [this.mem02_03[0].getState(), this.mem02_03[1].getState()],
mem0C_1F: [this.mem0C_1F[0].getState(), this.mem0C_1F[1].getState()],
mem60_BF: [this.mem60_BF[0].getState(), this.mem60_BF[1].getState()],
memD0_DF: [
this.memD0_DF[0].getState(),
this.memD0_DF[1].getState(),
this.memD0_DF[2].getState(),
this.memD0_DF[3].getState(),
this.memD0_DF[4].getState()
],
memE0_FF: [
this.memE0_FF[0].getState(),
this.memE0_FF[1].getState(),
this.memE0_FF[2].getState()
]
};
}
public setState(state: MMUState) {
this._readbsr = state.readbsr;
this._writebsr = state.writebsr;
this._bank1 = state.bank1;
this._prewrite = state.prewrite;
this._intcxrom = state.intcxrom;
this._slot3rom = state.slot3rom;
this._intc8rom = state.intc8rom;
this._auxRamRead = state.auxRamRead;
this._auxRamWrite = state.auxRamWrite;
this._altzp = state.altzp;
this._80store = state._80store;
this._page2 = state.page2;
this._hires = state.hires;
this.mem00_01[0].setState(state.mem00_01[0]);
this.mem00_01[1].setState(state.mem00_01[1]);
this.mem02_03[0].setState(state.mem02_03[0]);
this.mem02_03[1].setState(state.mem02_03[1]);
this.mem0C_1F[0].setState(state.mem0C_1F[0]);
this.mem0C_1F[1].setState(state.mem0C_1F[1]);
this.mem60_BF[0].setState(state.mem60_BF[0]);
this.mem60_BF[1].setState(state.mem60_BF[1]);
this.memD0_DF[0].setState(state.memD0_DF[0]);
this.memD0_DF[1].setState(state.memD0_DF[1]);
this.memD0_DF[2].setState(state.memD0_DF[2]);
this.memD0_DF[3].setState(state.memD0_DF[3]);
this.memD0_DF[4].setState(state.memD0_DF[4]);
this.memE0_FF[0].setState(state.memE0_FF[0]);
this.memE0_FF[1].setState(state.memE0_FF[1]);
this.memE0_FF[2].setState(state.memE0_FF[2]);
this._updateBanks();
}
}
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