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Mapper 268, support for ROMs with 1 MiB CHR-ROM

This commit is contained in:
Alexey 'Cluster' Avdyukhin 2022-12-12 23:13:42 +04:00
parent 773eaa868c
commit 47c2ce5a38
1 changed files with 7 additions and 3 deletions
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10
src/boards/coolboy.cpp
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@ -29,7 +29,7 @@
* |||| |||| * |||| ||||
* |||| |+++-- PRG offset (PRG A19, A18, A17) * |||| |+++-- PRG offset (PRG A19, A18, A17)
* |||| +----- Alternate CHR A17 * |||| +----- Alternate CHR A17
* ||++------- PRG offset (PRG A24, A23) * ||++------- PRG offset (PRG A24, A23), CHR offset (CHR A19, A18)
* |+--------- PRG mask (PRG A17 from 0: MMC3; 1: offset) * |+--------- PRG mask (PRG A17 from 0: MMC3; 1: offset)
* +---------- CHR mask (CHR A17 from 0: MMC3; 1: alternate) * +---------- CHR mask (CHR A17 from 0: MMC3; 1: alternate)
* *
@ -134,6 +134,7 @@ static void AA6023CW(uint32 A, uint8 V) {
(V & 0x80 & mask) | ((((EXPREGS[0] & 0b00001000) << 4) & ~mask)) // 7th bit (V & 0x80 & mask) | ((((EXPREGS[0] & 0b00001000) << 4) & ~mask)) // 7th bit
| ((EXPREGS[2] & 0x0F) << 3) // 6-3 bits | ((EXPREGS[2] & 0x0F) << 3) // 6-3 bits
| ((A >> 10) & 7) // 2-0 bits | ((A >> 10) & 7) // 2-0 bits
| ((EXPREGS[0] & 0b00110000) << 4) // There are some ROMs with 1 MiB CHR-ROM
); );
} }
else { else {
@ -148,7 +149,10 @@ static void AA6023CW(uint32 A, uint8 V) {
} }
// Simple MMC3 mode // Simple MMC3 mode
// Highest bit goes from MMC3 registers when EXPREGS[0]&0x80==0 or from EXPREGS[0]&0x08 otherwise // Highest bit goes from MMC3 registers when EXPREGS[0]&0x80==0 or from EXPREGS[0]&0x08 otherwise
setchr1(A, (V & mask) | (((EXPREGS[0] & 0x08) << 4) & ~mask)); setchr1(A,
(V & mask)
| (((EXPREGS[0] & 0x08) << 4) & ~mask)
| ((EXPREGS[0] & 0b00110000) << 4)); // There are some ROMs with 1 MiB CHR-ROM
} }
} }
@ -223,7 +227,7 @@ static void AA6023PW(uint32 A, uint8 V) {
} }
if (!(CREGS[3] & 0x10)) { if (!(CREGS[3] & 0x10)) {
// Regular MMC3 mode but can be extended to 2MByte // Regular MMC3 mode but can be extended to 2MiB
setprg8r(chip, A, (((base << 4) & ~mask)) | (V & mask)); setprg8r(chip, A, (((base << 4) & ~mask)) | (V & mask));
} }
else { else {