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apple2gs.cpp: don't allow read of write-only switches, fixes MT08564 [Peter Ferrie]

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This commit is contained in:
Peter Ferrie 2023-02-27 09:23:05 -08:00
parent deceecfbfb
commit 410a3dbeae
1 changed files with 4 additions and 21 deletions
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25
src/mame/apple/apple2gs.cpp
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@ -1501,29 +1501,12 @@ u8 apple2gs_state::c000_r(offs_t offset)
switch (offset)
{
case 0x00: // keyboard latch
// keyboard latch
case 0x00: case 0x01: case 0x02: case 0x03: case 0x04: case 0x05: case 0x06:
case 0x07: case 0x08: case 0x09: case 0x0a: case 0x0b: case 0x0c: case 0x0d:
case 0x0e: case 0x0f:
return uKeyboard;
case 0x02: // RAMRDOFF
m_ramrd = false;
auxbank_update();
break;
case 0x03: // RAMRDON
m_ramrd = true;
auxbank_update();
break;
case 0x04: // RAMWRTOFF
m_ramwrt = false;
auxbank_update();
break;
case 0x05: // RAMWRTON
m_ramwrt = true;
auxbank_update();
break;
case 0x10: // read any key down, reset keyboard strobe
keyglu_816_write(GLU_C010, 0);
return uKeyboardC010 | (uKeyboard & 0x7f);