91 lines
3.8 KiB
TypeScript
91 lines
3.8 KiB
TypeScript
import Apple2IO from 'js/apple2io';
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import MMU from '../../js/mmu';
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import { CPU6502 } from '@whscullin/cpu6502';
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import { HiresPage, LoresPage, VideoModes, VideoPage } from 'js/videomodes';
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import Apple2eROM from '../../js/roms/system/apple2e';
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import { MemoryPages } from 'js/types';
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function newFakeMemoryPages() {
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return {} as unknown as MemoryPages;
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}
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function newFakeVideoPage(): VideoPage {
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const bank0Pages = newFakeMemoryPages();
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const bank1Pages = newFakeMemoryPages();
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return {
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bank0() {
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return bank0Pages;
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},
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bank1() {
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return bank1Pages;
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},
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} as unknown as VideoPage;
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}
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function newFakeLoresPage(): LoresPage {
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return newFakeVideoPage() as unknown as LoresPage;
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}
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function newFakeHiresPage(): HiresPage {
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return newFakeVideoPage() as unknown as HiresPage;
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}
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describe('MMU', () => {
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const fakeVideoModes = {} as unknown as VideoModes;
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const fakeCPU = {} as unknown as CPU6502;
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const fakeLoResPage1 = newFakeLoresPage();
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const fakeLoResPage2 = newFakeLoresPage();
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const fakeHiResPage1 = newFakeHiresPage();
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const fakeHiResPage2 = newFakeHiresPage();
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const fakeApple2IO = {} as unknown as Apple2IO;
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it('is constructable', () => {
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const mmu = new MMU(fakeCPU, fakeVideoModes, fakeLoResPage1, fakeLoResPage2,
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fakeHiResPage1, fakeHiResPage2, fakeApple2IO, new Apple2eROM());
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expect(mmu).not.toBeNull();
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});
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it('requires prewrite to write to bank1', () => {
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const mmu = new MMU(fakeCPU, fakeVideoModes, fakeLoResPage1, fakeLoResPage2,
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fakeHiResPage1, fakeHiResPage2, fakeApple2IO, new Apple2eROM());
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// From https://github.com/whscullin/apple2js/issues/187
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// Action descriptions from Sather, Table 5.5, p. 5-24, UtAIIe:
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mmu._access(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE
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mmu._access(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE (write enabled)
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mmu._access(0x89, 0x00); // WRTCOUNT = 0, READ DISABLE (write still enabled)
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mmu._access(0x89); // WRTCOUNT = WRITCOUNT + 1, READ DISABLE (write still enabled)
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mmu.write(0xd0, 0x00, 0xa1);
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mmu._access(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE (write still enabled)
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expect(mmu.read(0xd0, 0x00)).toBe(0xa1);
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});
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it('prewrite is reset on write access before write', () => {
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const mmu = new MMU(fakeCPU, fakeVideoModes, fakeLoResPage1, fakeLoResPage2,
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fakeHiResPage1, fakeHiResPage2, fakeApple2IO, new Apple2eROM());
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// Action descriptions from Sather, Table 5.5, p. 5-24, UtAIIe:
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mmu._access(0x89, 0x00); // WRTCOUNT = 0, READ DISABLE
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mmu._access(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE (write not enabled yet)
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mmu._access(0x8b, 0x00); // WRTCOUNT = 0, READ ENABLE (write still not enabled)
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const oldValue = mmu.read(0xd0, 0x00);
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mmu.write(0xd0, 0x00, 0xa1); // writes to the void
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expect(mmu.read(0xd0, 0x00)).toBe(oldValue); // reads old value
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});
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it('write stays active with overzealous switching', () => {
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const mmu = new MMU(fakeCPU, fakeVideoModes, fakeLoResPage1, fakeLoResPage2,
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fakeHiResPage1, fakeHiResPage2, fakeApple2IO, new Apple2eROM());
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// Action descriptions from Sather, Table 5.5, p. 5-24, UtAIIe:
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mmu._access(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE
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mmu._access(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE (write enabled)
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mmu._access(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE (write enabled)
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mmu._access(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE (write enabled)
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mmu.write(0xd0, 0x00, 0xa1);
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mmu._access(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE (write still enabled)
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expect(mmu.read(0xd0, 0x00)).toBe(0xa1);
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});
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});
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