User talk:Hamtaro126

H126-ROM1 and H126-RAM1 mapper format (for next letter of ZZO38's Mapperset)

This mapper will be a DIY thing, I will not make carts, But it is possible to make them!

Based off a combo of UxROM and MMC3

PPU (H126-ROM1):

• $0000-$03FF: 4k CHR bank 1 (uses $40C0)
• $0400-$07FF: 4k CHR bank 2 (uses $40C1)
• $0800-$0BFF: 4k CHR bank 3 (uses $40C2)
• $0C00-$0FFF: 4k CHR bank 4 (uses $40C3)
• $1000-$13FF: 4k CHR bank 5 (uses $40C4)
• $1400-$17FF: 4k CHR bank 6 (uses $40C5)
• $1800-$1BFF: 4k CHR bank 7 (uses $40C6)
• $1C00-$1FFF: 4k CHR bank 8 (uses $40C7)

PPU (H126-RAM1):

• $0000-$1FFF - 8k CHR RAM ($40C0-$40C7 are unused!)

RAM:

• $5000-$5FFF: 2k WRAM (optional)
• $6000-$7FFF: 8k SaveRAM or WRAM

Unused Extension (optional):

• $40C8: Unused Extension

ROM:

• $8000-$9FFF: 8k ROM bank 1 (uses $40C9)
• $A000-$BFFF: 8k ROM bank 2 (uses $40CA)
• $C000-$DFFF: 8k ROM bank 3 (uses $40CB)
• $E000-$FFFF: 8k ROM bank 4 (Fixed)

IRQ (optional):

• $40CC: Mirroring
• $40CD: Control Disable
• $40CE: Control Enable
• $40CF: Cycle IRQ Counter Value (MMC5 style)

This is a WIP, May Change!!! --Hamtaro126 (talk) 08:10, 29 June 2013 (MDT)

Discussion

I suggest to use $40C8, $40C9, $40CA for the PRG ROM bank select, and having $40CB unused. I think this would be more logical and probably simpler to build. --Zzo38 (talk) 12:10, 29 June 2013 (MDT)

This is very similar to Taito's X1-017. —Lidnariq (talk) 13:12, 29 June 2013 (MDT)