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Attempts to finish off shadowing.

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This commit is contained in:
Thomas Harte 2020-10-27 22:05:04 -04:00
parent 0c700094ea
commit ad93ad6018
1 changed files with 11 additions and 3 deletions
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14
Machines/Apple/AppleIIgs/MemoryMap.hpp
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@ -77,7 +77,7 @@ class MemoryMap {
// language switches. Which will naturally align with shadowable zones.
set_regions(0x00, {
0x0200, 0x0400, 0x0800, 0x0c00,
0x2000, 0x4000,
0x2000, 0x4000, 0x6000,
0xc000, 0xc100, 0xc300, 0xc400, 0xc800,
0xd000, 0xe000,
0xffff
@ -339,8 +339,7 @@ class MemoryMap {
}
void set_shadowing() {
// TODO: check speed register bit to determine potential effect
// on all pages beyond $00 and $01.
const bool inhibit_all_pages = speed_register_ & 0x10;
#define apply(flag, zone) \
if(flag) { \
@ -352,22 +351,31 @@ class MemoryMap {
// Text Page 1, main and auxiliary.
apply(shadow_register_ & 0x01, 0x0004);
apply(shadow_register_ & 0x01, 0x0104);
apply((shadow_register_ & 0x01) && inhibit_all_pages, 0x0204);
apply((shadow_register_ & 0x01) && inhibit_all_pages, 0x0304);
// Text Page 2, main and auxiliary.
// TODO: on a ROM03 machine only.
apply(shadow_register_ & 0x20, 0x0008);
apply(shadow_register_ & 0x20, 0x0108);
apply((shadow_register_ & 0x20) && inhibit_all_pages, 0x0208);
apply((shadow_register_ & 0x20) && inhibit_all_pages, 0x0308);
// Hi-res graphics Page 1, main and auxiliary.
apply(shadow_register_ & 0x02, 0x0020);
apply(shadow_register_ & 0x12, 0x0120);
apply((shadow_register_ & 0x02) && inhibit_all_pages, 0x0220);
apply((shadow_register_ & 0x12) && inhibit_all_pages, 0x0320);
// Hi-res graphics Page 2, main and auxiliary.
apply(shadow_register_ & 0x04, 0x0040);
apply(shadow_register_ & 0x14, 0x0140);
apply((shadow_register_ & 0x04) && inhibit_all_pages, 0x0240);
apply((shadow_register_ & 0x14) && inhibit_all_pages, 0x0340);
// Residue of Super Hi-Res.
apply(shadow_register_ & 0x08, 0x0160);
apply((shadow_register_ & 0x08) && inhibit_all_pages, 0x0360);
// TODO: does inhibiting Super Hi-Res also affect the regular hi-res pages?