51 lines
2.5 KiB
TypeScript
51 lines
2.5 KiB
TypeScript
import LanguageCard from '../../../js/cards/langcard';
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import Apple2ROM from '../../../js/roms/system/fpbasic';
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describe('Language Card', () => {
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it('is constructable', () => {
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const langCard = new LanguageCard(new Apple2ROM());
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expect(langCard).not.toBeNull();
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});
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it('requires prewrite to write to bank1', () => {
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const langCard = new LanguageCard(new Apple2ROM());
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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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langCard.ioSwitch(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE
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langCard.ioSwitch(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE (write enabled)
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langCard.ioSwitch(0x89, 0x00); // WRTCOUNT = 0, READ DISABLE (write still enabled)
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langCard.ioSwitch(0x89); // WRTCOUNT = WRITCOUNT + 1, READ DISABLE (write still enabled)
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langCard.write(0xd0, 0x00, 0xa1);
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langCard.ioSwitch(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE (write still enabled)
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expect(langCard.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 langCard = new LanguageCard(new Apple2ROM());
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// Action descriptions from Sather, Table 5.5, p. 5-24, UtAIIe:
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langCard.ioSwitch(0x89, 0x00); // WRTCOUNT = 0, READ DISABLE
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langCard.ioSwitch(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE (write not enabled yet)
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langCard.ioSwitch(0x8b, 0x00); // WRTCOUNT = 0, READ ENABLE (write still not enabled)
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const oldValue = langCard.read(0xd0, 0x00);
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langCard.write(0xd0, 0x00, 0xa1); // writes to the void
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expect(langCard.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 langCard = new LanguageCard(new Apple2ROM());
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// Action descriptions from Sather, Table 5.5, p. 5-24, UtAIIe:
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langCard.ioSwitch(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE
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langCard.ioSwitch(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE (write enabled)
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langCard.ioSwitch(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE (write enabled)
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langCard.ioSwitch(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE (write enabled)
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langCard.write(0xd0, 0x00, 0xa1);
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langCard.ioSwitch(0x8b); // WRTCOUNT = WRTCOUNT + 1, READ ENABLE (write still enabled)
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expect(langCard.read(0xd0, 0x00)).toBe(0xa1);
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});
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}); |