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Separate out Saturn 128K IO access from 16K LC access

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This commit is contained in:
michaelangel007 2017-04-27 15:01:44 -07:00
parent a9cb5e227a
commit b3b39e19f4
1 changed files with 48 additions and 12 deletions
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60
source/Memory.cpp
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@ -1610,24 +1610,60 @@ BYTE __stdcall MemSetPaging(WORD programcounter, WORD address, BYTE write, BYTE
{
SetMemMode(memmode & ~(MF_BANK2 | MF_HIGHRAM));
if (!(address & 8))
SetMemMode(memmode | MF_BANK2);
// C081 C089 Read ROM, Write enable
// C082 C08A Read ROM, Write protect
if (((address & 2) >> 1) == (address & 1))
SetMemMode(memmode | MF_HIGHRAM);
if (address & 1) // GH#392
#ifdef SATURN
/*
Bin Addr.
$C0N0 4K Bank A, RAM read, Write protect
$C0N1 4K Bank A, ROM read, Write enabled
$C0N2 4K Bank A, ROM read, Write protect
$C0N3 4K Bank A, RAM read, Write enabled
0100 $C0N4 select 16K Bank 1
0101 $C0N5 select 16K Bank 2
0110 $C0N6 select 16K Bank 3
0111 $C0N7 select 16K Bank 4
$C0N8 4K Bank B, RAM read, Write protect
$C0N9 4K Bank B, ROM read, Write enabled
$C0NA 4K Bank B, ROM read, Write protect
$C0NB 4K Bank B, RAM read, Write enabled
1100 $C0NC select 16K Bank 5
1101 $C0ND select 16K Bank 6
1110 $C0NE select 16K Bank 7
1111 $C0NF select 16K Bank 8
*/
if (g_uSaturnTotalBanks)
{
if (!write && g_bLastWriteRam)
if ((address & 7) > 3)
{
SetMemMode(memmode | MF_WRITERAM); // UTAIIe:5-23
g_uSaturnActiveBank = 0 // Saturn 128K Language Card Bank 0 .. 7
| (address >> 1) & 4
| (address >> 0) & 3
;
// TODO: Update paging()
}
}
else
#endif // SATURN
{
SetMemMode(memmode & ~(MF_WRITERAM)); // UTAIIe:5-23
// Apple 16K Language Card
if (!(address & 8))
SetMemMode(memmode | MF_BANK2);
// C081 C089 Read ROM, Write enable
// C082 C08A Read ROM, Write protect
if (((address & 2) >> 1) == (address & 1))
SetMemMode(memmode | MF_HIGHRAM);
if (address & 1) // GH#392
{
if (!write && g_bLastWriteRam)
{
SetMemMode(memmode | MF_WRITERAM); // UTAIIe:5-23
}
}
else
{
SetMemMode(memmode & ~(MF_WRITERAM)); // UTAIIe:5-23
}
}
g_bLastWriteRam = (address & 1) && (!write); // UTAIIe:5-23
}