Excitebike
Mapper Conversion Patch
FROM Mapper 0 (NROM) TO Mapper 5 (MMC5)
Converted by Dracula X
RELEASE DATE: 03/30/2022
Last Modified: 05/2/2022


The main game of $C000-$FFFF is now located at $0010-$4010

MMC5 Setup is at $FF98

PRG Bankswitch Routine is at $F85B

To switch banks from $C000 - $FFFF, use like so:

LDA page_number
JSR $F85B
JMP to anywhere in $8000-$BFFF

Compact Mapper makes it easier to switch banks and it is located at $F870:

JSR Bank_00	-	$F882
JSR New Location

JSR Bank_01	-	$F886
JSR New Location

goes up to bank $8D

Do this in $8000-$BFFF for Compact Mapper Example:
; somewhere in 8000-BFFF, bank 0
JSR to a bankswitching routine in a fixed bank

; somewhere in 8000-BFFF, bank 1
RTS

; somewhere in C000-FFFF, fixed bank
; saving & restoring AXY regs may be needed
JSR switch to bank 1
JSR to RTS in bank 1 or anywhere in $8000-$BFFF
JSR switch to bank 0
+ original code from bank 0 that was replaced with your JSR
RTS

CHR bank 1 (Right side of PPU) is at $F854

To switch background pages, use like so:

LDA page_number
JSR $F854

Nametable Mapping Routine (one of its uses is mirroring) is at $F850

To change mirroring for instance, use like so:

LDA mirroring_number (#$44 for Vertical, #$50 for Horizontal)
JSR $F850

The SoundEngine that was at $FA44 is now at Bank_00
Now you have all that free space to use in the fixed bank.

8KB CHR-ROM pages is located at $20000

Excitebike (Europe) is also supported!

Supported Hacks:
Some hacks are supported.

Hacks not Supported:
NROM to MMC1
NROM to MMC3
Excitebike - Risker

Use Delta Patcher to patch the xdelta file to the ROM. 
Ignore the checksum and then patch the file. If something
not right, then patch your hack ROM with your IPS file to the hack.
Apply your hack to the xdelta file and then reapply the ips to
the file.

Credits:
Rockman or RetroRain: for info on how to convert the mapper!
Disch: for his mapper docs and a better MMC5 startup!
infidelity: for info on how to convert NROM to MMC5.
Shredder: for Compact Mapper
Cyneprepou4uk: for the source code so I can get the sound engine fixed.

Changes for this version 1.2: 5-2-2022
Compact Mapper have been added.

Non Supported Emulators:
RockNES