Super Mario Bros.
Mapper Conversion Patch
FROM Mapper 0 (NROM) TO Mapper 5 (MMC5)
Converted by Dracula X
RELEASE DATE: 06/26/2021
Last Modified: 05/2/2022


The main game of $C000-$FFFF is now located at $0010-$C010

MMC5 Setup is at $ff80 fixed bank

PRG Bankswitch Routine is at $C020

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


In a fixed bank:
LDA page_number
JSR $C020
JMP to anywhere in $8000-$BFFF

or

Try this in range $C000 to $FFFF
LDA page_number
JSR $C020
JSR to anywhere in $8000-$BFFF
LDA #$00
JSR $C020
RTS

or

LDA page_number #$80
PHA
LDA page_number #$00
PHA
LDA page_number #$02
JSR $C030
RTS

Compact Mapper makes it easier to switch banks and it is located at $F2DA:

JSR Bank_01	-	$F2F0
JSR New Location
JSR Bank_00
RTS

JSR Bank_02	-	$F2F4
JSR New Location
JSR Bank_00
RTS

goes up to bank $8D

Do this in $8000-$BFFF for Compact Mapper Example:
; somewhere in 8000-BFFF, bank 0
JMP 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 at $c020
+ original code from bank 0 that was replaced with your JSR
RTS


CHR bank 1 (Right side of PPU) is at $C014

To switch background pages, use like so:

LDA page_number
JSR $C014



Nametable Mapping Routine (one of its uses is mirroring) is at $C010

To change mirroring for instance, use like so:

LDA mirroring_number (#$44 for Vertical, #$50 for Horizontal)
JSR $C010

8KB CHR-ROM pages is located at $20000

Bank 06 is now at bank 00.
The settings that was at $BFDC is located at Bank 1 at $8000.
The settings that was at $F2D0 for SoundEngine is located at Bank 2 at $8000.



Supported Hacks:
Some hacks are supported

Hacks not Supported:
NROM to MMC1
NROM to MMC3
Some hacks are not supported


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

Changes for this version 1.3.1: 5-2-2022
Fixed the compact mapper bug.

Changes for this version 1.3.0: 5-1-2022
Compact Mapper have been added.

Changes for this version 1.2.1: 4-6-2022
The game wasnt loading and fixed it.

Changes for this version 1.2.0: 4-5-2022
Added PRG Mode 2 to the patch.
I have three patches for PRG Mode 1, 2 and 3.
Patch 1 is for Mode 01.
Patch 2 is for Mode 02.
Patch 3 is for Mode 03.
Moved bank 06 to bank 00.


Changes for this version 1.1.0:
Added PRG Mode 3 to the patch.
I have two patches for PRG Mode 1 and 3.
Patch 1 is for Mode 01.
Patch 2 is for Mode 03.
Removed CHR Bank 0.

If i'm missing anything about bankswitching info, let me know. Thanks!


All emulators works!