Clean up, restructure MMU switches
This commit is contained in:
Will Scullin
parent
24680b989f
commit
3c5ded7058
9
js/gl.ts
9
js/gl.ts
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@ -664,7 +664,6 @@ export class HiresPageGL implements Memory, Restorable<GraphicsState> {
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export class VideoModesGL implements VideoModes {
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private _grs: LoresPage[];
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private _hgrs: HiresPage[];
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private _flag = 0;
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private _sv: any;
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private _displayConfig: any;
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private _monoMode: boolean = false;
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@ -729,7 +728,6 @@ export class VideoModesGL implements VideoModes {
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_80colMode = false;
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altCharMode = false;
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this._flag = 0;
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an3 = true;
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this._refresh();
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@ -768,9 +766,6 @@ export class VideoModesGL implements VideoModes {
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hires(on: boolean) {
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const old = hiresMode;
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hiresMode = on;
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if (!on) {
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this._flag = 0;
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}
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if (old != on) {
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this._refresh();
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@ -783,10 +778,6 @@ export class VideoModesGL implements VideoModes {
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const old = an3;
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an3 = on;
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if (on) {
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this._flag = ((this._flag << 1) | (_80colMode ? 0x0 : 0x1)) & 0x3;
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}
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if (old != on) {
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this._refresh();
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}
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503
js/mmu.ts
503
js/mmu.ts
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@ -12,7 +12,7 @@
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import CPU6502 from './cpu6502';
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import RAM, { RAMState } from './ram';
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import ROM, { ROMState } from './roms/rom';
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import { debug, toHex } from './util';
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import { debug } from './util';
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import { byte, Memory, Restorable } from './types';
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import Apple2IO from './apple2io';
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import { HiresPage, LoresPage, VideoModes } from './videomodes';
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@ -21,7 +21,7 @@ import { HiresPage, LoresPage, VideoModes } from './videomodes';
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* I/O Switch locations
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*/
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const LOC = {
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// 80 Column
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// 80 Column memory
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_80STOREOFF: 0x00,
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_80STOREON: 0x01,
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@ -40,6 +40,7 @@ const LOC = {
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SLOTC3ROMOFF: 0x0A,
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SLOTC3ROMON: 0x0B,
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// 80 Column video
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CLR80VID: 0x0C, // clear 80 column mode
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SET80VID: 0x0D, // set 80 column mode
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CLRALTCH: 0x0E, // clear mousetext
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@ -63,54 +64,38 @@ const LOC = {
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RDALTCH: 0x1E, // using alternate character set
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RD80VID: 0x1F, // using 80-column display mode
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// Graphics
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PAGE1: 0x54, // select text/graphics page1 main/aux
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PAGE2: 0x55, // select text/graphics page2 main/aux
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RESET_HIRES: 0x56,
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SET_HIRES: 0x57,
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DHIRESON: 0x5E, // Enable double hires
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DHIRESOFF: 0x5F, // Disable double hires
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DHIRESON: 0x5E, // Enable double hires (CLRAN3)
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DHIRESOFF: 0x5F, // Disable double hires (SETAN3)
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// Misc
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BANK: 0x73, // Back switched RAM card bank
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IOUDISON: 0x7E, // W IOU Disable on / R7 IOU Disable
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IOUDISOFF: 0x7F, // W IOU Disable off / R7 Double Hires
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// Language Card
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// Bank 2
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READBSR2: 0x80,
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WRITEBSR2: 0x81,
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OFFBSR2: 0x82,
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READWRBSR2: 0x83,
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// Shadow Bank 2
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_READBSR2: 0x84,
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_WRITEBSR2: 0x85,
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_OFFBSR2: 0x86,
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_READWRBSR2: 0x87,
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// Bank 1
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READBSR1: 0x88,
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WRITEBSR1: 0x89,
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OFFBSR1: 0x8a,
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READWRBSR1: 0x8b,
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// Shadow Bank 1
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_READBSR1: 0x8c,
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_WRITEBSR1: 0x8d,
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_OFFBSR1: 0x8e,
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_READWRBSR1: 0x8f
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};
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class Switches implements Memory {
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// Remapping of LOCS from string -> number to number -> string
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private locs: { [loc: number]: string } = {};
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constructor(private readonly mmu: MMU, private readonly io: any) {
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Object.keys(LOC).forEach((loc: keyof typeof LOC) => {
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const v = LOC[loc];
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this.locs[v] = loc;
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});
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}
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constructor(private mmu: MMU) {}
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start() {
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return 0xC0;
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@ -121,21 +106,11 @@ class Switches implements Memory {
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}
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read(_page: byte, off: byte) {
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let result;
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if (off in this.locs) {
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result = this.mmu._access(off);
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} else {
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result = this.io.ioSwitch(off, undefined);
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}
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return result;
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return this.mmu._access(off) || 0;
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}
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write(_page: byte, off: byte, val: byte) {
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if (off in this.locs) {
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this.mmu._access(off, val);
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} else {
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this.io.ioSwitch(off, val);
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}
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this.mmu._access(off, val);
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}
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}
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@ -225,7 +200,7 @@ export default class MMU implements Memory, Restorable<MMUState> {
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private _vbEnd = 0;
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private switches = new Switches(this, this.io);
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private switches = new Switches(this);
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private auxRom = new AuxRom(this, this.rom);
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// These fields represent the bank-switched memory ranges.
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@ -359,7 +334,7 @@ export default class MMU implements Memory, Restorable<MMUState> {
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}
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_debug(..._args: any[]) {
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// debug.apply(this, arguments);
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// debug.apply(this, _args);
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}
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_setIntc8rom(on: boolean) {
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@ -482,254 +457,90 @@ export default class MMU implements Memory, Restorable<MMUState> {
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}
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}
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/*
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* The Big Switch
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*/
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// Apple //e memory management
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_access(off: byte, val?: byte) {
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let result;
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const readMode = val === undefined;
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const writeMode = val !== undefined;
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_accessMMUSet(off: byte, _val?: byte) {
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switch (off) {
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// Apple //e memory management
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case LOC._80STOREOFF:
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if (writeMode) {
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this._80store = false;
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this._debug('80 Store Off');
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this.vm.page(this._page2 ? 2 : 1);
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} else {
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// Chain to io for keyboard
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result = this.io.ioSwitch(off, val);
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}
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this._80store = false;
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this._debug('80 Store Off', _val);
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this.vm.page(this._page2 ? 2 : 1);
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break;
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case LOC._80STOREON:
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if (writeMode) {
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this._80store = true;
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this._debug('80 Store On');
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} else
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result = 0;
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this._80store = true;
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this._debug('80 Store On', _val);
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break;
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case LOC.RAMRDOFF:
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if (writeMode) {
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this._auxRamRead = false;
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this._debug('Aux RAM Read Off');
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} else
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result = 0;
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this._auxRamRead = false;
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this._debug('Aux RAM Read Off');
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break;
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case LOC.RAMRDON:
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if (writeMode) {
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this._auxRamRead = true;
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this._debug('Aux RAM Read On');
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} else
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result = 0;
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this._auxRamRead = true;
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this._debug('Aux RAM Read On');
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break;
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case LOC.RAMWROFF:
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if (writeMode) {
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this._auxRamWrite = false;
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this._debug('Aux RAM Write Off');
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} else
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result = 0;
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this._auxRamWrite = false;
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this._debug('Aux RAM Write Off');
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break;
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case LOC.RAMWRON:
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if (writeMode) {
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this._auxRamWrite = true;
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this._debug('Aux RAM Write On');
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} else
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result = 0;
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this._auxRamWrite = true;
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this._debug('Aux RAM Write On');
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break;
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case LOC.INTCXROMOFF:
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if (writeMode) {
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this._intcxrom = false;
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this._intc8rom = false;
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this._debug('Int CX ROM Off');
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}
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this._intcxrom = false;
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this._intc8rom = false;
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this._debug('Int CX ROM Off');
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break;
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case LOC.INTCXROMON:
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if (writeMode) {
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this._intcxrom = true;
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this._debug('Int CX ROM On');
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}
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this._intcxrom = true;
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this._debug('Int CX ROM On');
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break;
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case LOC.ALTZPOFF: // 0x08
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if (writeMode) {
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this._altzp = false;
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this._debug('Alt ZP Off');
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}
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this._altzp = false;
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this._debug('Alt ZP Off');
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break;
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case LOC.ALTZPON: // 0x09
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if (writeMode) {
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this._altzp = true;
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this._debug('Alt ZP On');
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}
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this._altzp = true;
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this._debug('Alt ZP On');
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break;
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case LOC.SLOTC3ROMOFF: // 0x0A
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if (writeMode) {
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this._slot3rom = false;
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this._debug('Slot 3 ROM Off');
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}
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this._slot3rom = false;
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this._debug('Slot 3 ROM Off');
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break;
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case LOC.SLOTC3ROMON: // 0x0B
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if (writeMode) {
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this._slot3rom = true;
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this._debug('Slot 3 ROM On');
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}
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this._slot3rom = true;
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this._debug('Slot 3 ROM On');
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break;
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// Graphics Switches
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case LOC.CLR80VID:
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if (writeMode) {
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this._debug('80 Column Mode off');
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this.vm._80col(false);
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}
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this._debug('80 Column Mode off');
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this.vm._80col(false);
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break;
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case LOC.SET80VID:
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if (writeMode) {
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this._debug('80 Column Mode on');
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this.vm._80col(true);
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}
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this._debug('80 Column Mode on');
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this.vm._80col(true);
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break;
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case LOC.CLRALTCH:
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if (writeMode) {
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this._debug('Alt Char off');
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this.vm.altchar(false);
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}
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this._debug('Alt Char off');
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this.vm.altchar(false);
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break;
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case LOC.SETALTCH:
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if (writeMode) {
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this._debug('Alt Char on');
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this.vm.altchar(true);
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}
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break;
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case LOC.PAGE1:
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this._page2 = false;
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if (!this._80store) {
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result = this.io.ioSwitch(off, val);
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}
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this._debug('Page 2 off');
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break;
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case LOC.PAGE2:
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this._page2 = true;
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if (!this._80store) {
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result = this.io.ioSwitch(off, val);
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}
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this._debug('Page 2 on');
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this._debug('Alt Char on');
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this.vm.altchar(true);
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break;
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}
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this._updateBanks();
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}
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case LOC.RESET_HIRES:
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this._hires = false;
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result = this.io.ioSwitch(off, val);
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this._debug('Hires off');
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break;
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// Status registers
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case LOC.DHIRESON:
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if (this._iouDisable) {
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this.vm.doubleHires(true);
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} else {
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result = this.io.ioSwitch(off, val); // an3
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}
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break;
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case LOC.DHIRESOFF:
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if (this._iouDisable) {
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this.vm.doubleHires(false);
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} else {
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result = this.io.ioSwitch(off, val); // an3
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}
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break;
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case LOC.SET_HIRES:
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this._hires = true;
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result = this.io.ioSwitch(off, val);
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this._debug('Hires on');
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break;
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case LOC.IOUDISON:
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if (writeMode) {
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this._iouDisable = true;
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}
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result = this._iouDisable ? 0x00 : 0x80;
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break;
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case LOC.IOUDISOFF:
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if (writeMode) {
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this._iouDisable = false;
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}
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result = this.vm.isDoubleHires() ? 0x80 : 0x00;
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break;
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// Language Card Switches
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case LOC.READBSR2: // 0xC080
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case LOC._READBSR2: // 0xC084
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this._bank1 = false;
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this._readbsr = true;
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this._writebsr = false;
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this._prewrite = false;
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// _debug('Bank 2 Read');
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break;
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case LOC.WRITEBSR2: // 0xC081
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case LOC._WRITEBSR2: // 0xC085
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this._bank1 = false;
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this._readbsr = false;
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if (readMode) { this._writebsr = this._prewrite; }
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this._prewrite = readMode;
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// _debug('Bank 2 Write');
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break;
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case LOC.OFFBSR2: // 0xC082
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case LOC._OFFBSR2: // 0xC086
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this._bank1 = false;
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this._readbsr = false;
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this._writebsr = false;
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this._prewrite = false;
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// _debug('Bank 2 Off');
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break;
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case LOC.READWRBSR2: // 0xC083
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case LOC._READWRBSR2: // 0xC087
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this._bank1 = false;
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this._readbsr = true;
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if (readMode) { this._writebsr = this._prewrite; }
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this._prewrite = readMode;
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// _debug('Bank 2 Read/Write');
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break;
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case LOC.READBSR1: // 0xC088
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case LOC._READBSR1: // 0xC08c
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this._bank1 = true;
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this._readbsr = true;
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this._writebsr = false;
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this._prewrite = false;
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// _debug('Bank 1 Read');
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break;
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case LOC.WRITEBSR1: // 0xC089
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case LOC._WRITEBSR1: // 0xC08D
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this._bank1 = true;
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this._readbsr = false;
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if (readMode) { this._writebsr = this._prewrite; }
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this._prewrite = readMode;
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// _debug('Bank 1 Write');
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break;
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case LOC.OFFBSR1: // 0xC08A
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case LOC._OFFBSR1: // 0xC08E
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this._bank1 = true;
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this._readbsr = false;
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this._writebsr = false;
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this._prewrite = false;
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// _debug('Bank 1 Off');
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break;
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case LOC.READWRBSR1: // 0xC08B
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case LOC._READWRBSR1: // 0xC08F
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this._bank1 = true;
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this._readbsr = true;
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if (readMode) { this._writebsr = this._prewrite; }
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this._prewrite = readMode;
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//_debug('Bank 1 Read/Write');
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break;
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// Status registers
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_accessStatus(off: byte, _val?: byte) {
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let result = 0;
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switch(off) {
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case LOC.BSRBANK2:
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this._debug('Bank 2 Read ' + !this._bank1);
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result = !this._bank1 ? 0x80 : 0x00;
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@ -784,22 +595,208 @@ export default class MMU implements Memory, Restorable<MMUState> {
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case LOC.RDALTCH:
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result = this.vm.isAltChar() ? 0x80 : 0x0;
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break;
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default:
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debug('MMU missing register ' + toHex(off));
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break;
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}
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if (result !== undefined)
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return result;
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return result;
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}
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result = 0;
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_accessIOUDisable(off: byte, val?: byte) {
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const writeMode = val !== undefined;
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let result;
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switch (off) {
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case LOC.IOUDISON:
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if (writeMode) {
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this._iouDisable = true;
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} else {
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result = this._iouDisable ? 0x00 : 0x80;
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}
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break;
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case LOC.IOUDISOFF:
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if (writeMode) {
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this._iouDisable = false;
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} 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;
|
||||
|
||||
switch (off & 0x8b) {
|
||||
// Language Card Switches
|
||||
|
||||
case LOC.READBSR2: // 0xC080
|
||||
this._bank1 = false;
|
||||
this._readbsr = true;
|
||||
this._writebsr = false;
|
||||
this._prewrite = false;
|
||||
// _debug('Bank 2 Read');
|
||||
break;
|
||||
case LOC.WRITEBSR2: // 0xC081
|
||||
this._bank1 = false;
|
||||
this._readbsr = false;
|
||||
if (readMode) { this._writebsr = this._prewrite; }
|
||||
this._prewrite = readMode;
|
||||
// _debug('Bank 2 Write');
|
||||
break;
|
||||
case LOC.OFFBSR2: // 0xC082
|
||||
this._bank1 = false;
|
||||
this._readbsr = false;
|
||||
this._writebsr = false;
|
||||
this._prewrite = false;
|
||||
// _debug('Bank 2 Off');
|
||||
break;
|
||||
case LOC.READWRBSR2: // 0xC083
|
||||
this._bank1 = false;
|
||||
this._readbsr = true;
|
||||
if (readMode) { this._writebsr = this._prewrite; }
|
||||
this._prewrite = readMode;
|
||||
// _debug('Bank 2 Read/Write');
|
||||
break;
|
||||
case LOC.READBSR1: // 0xC088
|
||||
this._bank1 = true;
|
||||
this._readbsr = true;
|
||||
this._writebsr = false;
|
||||
this._prewrite = false;
|
||||
// _debug('Bank 1 Read');
|
||||
break;
|
||||
case LOC.WRITEBSR1: // 0xC089
|
||||
this._bank1 = true;
|
||||
this._readbsr = false;
|
||||
if (readMode) { this._writebsr = this._prewrite; }
|
||||
this._prewrite = readMode;
|
||||
// _debug('Bank 1 Write');
|
||||
break;
|
||||
case LOC.OFFBSR1: // 0xC08A
|
||||
this._bank1 = true;
|
||||
this._readbsr = false;
|
||||
this._writebsr = false;
|
||||
this._prewrite = false;
|
||||
// _debug('Bank 1 Off');
|
||||
break;
|
||||
case LOC.READWRBSR1: // 0xC08B
|
||||
this._bank1 = true;
|
||||
this._readbsr = true;
|
||||
if (readMode) { this._writebsr = this._prewrite; }
|
||||
this._prewrite = readMode;
|
||||
//_debug('Bank 1 Read/Write');
|
||||
break;
|
||||
}
|
||||
this._updateBanks();
|
||||
}
|
||||
|
||||
/*
|
||||
* 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);
|
||||
} 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();
|
||||
|
|
|
|||
Loading…
Reference in New Issue