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Improves commentary.

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This commit is contained in:
Thomas Harte 2020-11-16 21:46:35 -05:00
parent 6dfad6a44b
commit 952891d1b6
1 changed files with 9 additions and 1 deletions
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10
Machines/Apple/AppleIIgs/MemoryMap.hpp
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@ -414,6 +414,10 @@ class MemoryMap {
// Hi-res graphics Page 1, main and auxiliary — $2000–$4000;
// also part of the super high-res graphics page.
//
// Test applied: both the graphics page inhibit and, on odd
// pages, the super high-res inhibit must be applied to inhibit
// this area.
apply(shadow_register_ & 0x02, 0x0020);
apply((shadow_register_ & 0x12) && (shadow_register_ & 0x08), 0x0120);
apply((shadow_register_ & 0x02) || inhibit_all_pages, 0x0220);
@ -425,6 +429,10 @@ class MemoryMap {
// Hi-res graphics Page 2, main and auxiliary — $4000–$6000;
// also part of the super high-res graphics page.
//
// Test applied: both the graphics page inhibit and, on odd
// pages, the super high-res inhibit must be applied to inhibit
// this area.
apply(shadow_register_ & 0x04, 0x0040);
apply((shadow_register_ & 0x14) && (shadow_register_ & 0x08), 0x0140);
apply((shadow_register_ & 0x04) || inhibit_all_pages, 0x0240);
@ -434,7 +442,7 @@ class MemoryMap {
assert(region_map[0x0260] == region_map[0x0240]+1);
assert(region_map[0x0360] == region_map[0x0340]+1);
// Residue of Super Hi-Res — $6000–$a000
// Residue of Super Hi-Res — $6000–$a000 (odd pages only).
apply(shadow_register_ & 0x08, 0x0160);
apply((shadow_register_ & 0x08) || inhibit_all_pages, 0x0360);
assert(region_map[0x01a0] == region_map[0x0160]+1);