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This commit is contained in:
Andrei Holub 2025-03-28 12:54:05 -04:00
parent 3a86819a55
commit 4fc7755730
1 changed files with 5 additions and 5 deletions
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10
src/mame/sinclair/spec128.cpp
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@ -205,6 +205,7 @@ template <u8 Bank> void spectrum_128_state::spectrum_128_ram_w(offs_t offset, u8
((u8*)m_bank_ram[Bank]->base())[offset] = data; ((u8*)m_bank_ram[Bank]->base())[offset] = data;
} }
// Base 128 models typically don't share RAM in bank0. Reserved for extension in 256+. // Base 128 models typically don't share RAM in bank0. Reserved for extension in 256+.
template void spectrum_128_state::spectrum_128_ram_w<0>(offs_t offset, u8 data); template void spectrum_128_state::spectrum_128_ram_w<0>(offs_t offset, u8 data);
@ -216,16 +217,15 @@ template <u8 Bank> u8 spectrum_128_state::spectrum_128_ram_r(offs_t offset)
return ((u8*)m_bank_ram[Bank]->base())[offset]; return ((u8*)m_bank_ram[Bank]->base())[offset];
} }
// D0-D2: RAM page located at 0x0c000-0x0ffff
// D3: Screen select (screen 0 in ram page 5, screen 1 in ram page 7
// D4: ROM select - which rom paged into 0x0000-0x03fff
// D5: Disable paging
void spectrum_128_state::spectrum_128_port_7ffd_w(offs_t offset, uint8_t data) void spectrum_128_state::spectrum_128_port_7ffd_w(offs_t offset, uint8_t data)
{ {
if (is_contended(offset)) content_early(); if (is_contended(offset)) content_early();
content_early(1); content_early(1);
// D0-D2: RAM page located at 0x0c000-0x0ffff
// D3 - Screen select (screen 0 in ram page 5, screen 1 in ram page 7
// D4 - ROM select - which rom paged into 0x0000-0x03fff
// D5 - Disable paging
// disable paging? // disable paging?
if (m_port_7ffd_data & 0x20) return; if (m_port_7ffd_data & 0x20) return;