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apple/apple2gs: Fix ROM0/1 ram size logic (#11264)

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* 256k (ROM 0/1) apple2gs doesn't have any extra memory above the base 4 banks
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ksherlock 2023-05-26 13:28:35 -04:00 committed by GitHub
parent 997be1f7e5
commit 2fb9b7c0e4
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1 changed files with 17 additions and 5 deletions
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22
src/mame/apple/apple2gs.cpp
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@ -727,12 +727,24 @@ void apple2gs_state::machine_start()
m_inh_slot = -1;
m_cnxx_slot = CNXX_UNCLAIMED;
// install memory beyond 256K/1M
address_space& space = m_maincpu->space(AS_PROGRAM);
int ramsize = m_ram_size - 0x20000; // subtract 128K for banks 0 and 1, which are handled specially
// RAM sizes for both classes of machine no longer include the Mega II RAM
space.install_ram(0x020000, ramsize - 1 + 0x20000, m_ram_ptr + 0x020000);
// install memory beyond 256K
int ramsize = m_ram_size;
if (!m_is_rom3 && m_ram_size <= 1280 * 1024)
{
ramsize -= 0x40000; // subtract 256k for banks 0, 1, e0, e1
}
else if (m_is_rom3 || m_ram_size == 1024 * 1024 * 8)
{
ramsize -= 0x20000; // subtract 128K for banks 0 and 1, which are handled specially
}
if (ramsize)
{
address_space& space = m_maincpu->space(AS_PROGRAM);
// RAM sizes for both classes of machine no longer include the Mega II RAM
space.install_ram(0x020000, ramsize - 1 + 0x20000, m_ram_ptr + 0x020000);
}
// setup save states
save_item(NAME(m_speaker_state));