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Provisionally reverses meaning of language card RAM bank select.

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This commit is contained in:
Thomas Harte 2020-11-29 21:57:17 -05:00
parent 35aa7612bb
commit e9c7e0b9dd
1 changed files with 5 additions and 3 deletions
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8
Machines/Apple/AppleIIgs/MemoryMap.hpp
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@ -247,12 +247,14 @@ class MemoryMap {
const auto zero_state = auxiliary_switches_.zero_state();
const bool inhibit_banks0001 = shadow_register_ & 0x40;
auto apply = [&language_state, &zero_state, this](uint32_t bank_base, uint8_t *ram) {
auto apply = [&language_state, this](uint32_t bank_base, uint8_t *ram) {
// All references below are to 0xc000, 0xd000 and 0xe000 but should
// work regardless of bank.
// This assumes bank 1 is the one before bank 2 when RAM is linear.
uint8_t *const lower_ram_bank = ram - (language_state.bank1 ? 0x1000 : 0x0000);
// This assumes bank 1 is the one before bank 2 when RAM is linear;
// also cf. the errata in tech note #30 — this flag enabled means bank 2;
// it disabled means bank 1.
uint8_t *const lower_ram_bank = ram - (language_state.bank1 ? 0x0000 : 0x1000);
// Crib the ROM pointer from a page it's always visible on.
const uint8_t *const rom = &regions[region_map[0xffd0]].read[0xffd000] - ((bank_base << 8) + 0xd000);