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apple2gs: Music Construction Set depends on an implementation detail of LC inhibit in bank 01 [Peter Ferrie, R. Belmont]

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This commit is contained in:
arbee 2019-11-17 23:36:58 -05:00
parent 1440dd0f11
commit a829064e83
1 changed files with 13 additions and 2 deletions
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15
src/mame/drivers/apple2gs.cpp
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@ -2570,6 +2570,7 @@ WRITE8_MEMBER(apple2gs_state::c000_w)
{
m_bank0_atc->set_bank(1);
m_bank1_atc->set_bank(1);
}
break;
@ -3443,6 +3444,11 @@ WRITE8_MEMBER(apple2gs_state::b1ram4000_w)
READ8_MEMBER(apple2gs_state::bank0_c000_r)
{
if (offset & 0x2000)
{
offset ^= 0x1000;
}
if (m_ramrd)
{
return m_ram_ptr[offset + 0x3c000];
@ -3453,6 +3459,11 @@ READ8_MEMBER(apple2gs_state::bank0_c000_r)
WRITE8_MEMBER(apple2gs_state::bank0_c000_w)
{
if (offset & 0x2000)
{
offset ^= 0x1000;
}
if (m_ramwrt)
{
m_ram_ptr[offset + 0x3c000] = data;
@ -3464,8 +3475,8 @@ WRITE8_MEMBER(apple2gs_state::bank0_c000_w)
READ8_MEMBER(apple2gs_state::bank1_0000_r) { return m_ram_ptr[offset + 0x30000]; }
WRITE8_MEMBER(apple2gs_state::bank1_0000_w) { m_ram_ptr[offset + 0x30000] = data; }
READ8_MEMBER(apple2gs_state::bank1_c000_r) { return m_ram_ptr[offset + 0x3c000]; }
WRITE8_MEMBER(apple2gs_state::bank1_c000_w) { m_ram_ptr[offset + 0x3c000] = data; }
READ8_MEMBER(apple2gs_state::bank1_c000_r) { if (offset & 0x2000) offset ^= 0x1000; return m_ram_ptr[offset + 0x3c000]; }
WRITE8_MEMBER(apple2gs_state::bank1_c000_w) { if (offset & 0x2000) offset ^= 0x1000; m_ram_ptr[offset + 0x3c000] = data; }
WRITE8_MEMBER(apple2gs_state::bank1_0000_sh_w)
{
m_ram_ptr[offset + 0x30000] = data;