29x is an MROM spin-off focusing on reprogrammable cartridges.
29x-ED3A_C5DB.zip - experimental build / preview
Developed and tested with Pocket firmware version 2.5 (APF @ 1.2)
MODRETRO CHROMATICS® - Patchy Matchy contains a compatible PCBA.
U5 = IS29GL032-70TLET (PART# under the ISSI logo, ignore second line).
The programming routines will only match this exact part# and reject all other (red "ID" error message, lower-left corner). The Patchy Matchy hardware is a 4MiB ROM / 32KiB RAM MBC5 cartridge (even though the original game is 32KiB ROM only!). The MBC5 is highly compatible with MBC1, MBC2 and MBC3 (sans-RTC) - Super Mario Land and Solar Striker (64KiB + MBC1) run flawlessly on this cartridge and are compatible with 29x.
MODRETRO cartridges fail to start on rare occasions on the Pocket. 29x will display a red CFI error message. Analogue's "PLAY CARTRIDGE" will display the standard "ERROR." message. Exiting and re-entering 29x will resolve the problem.
This program will erase the existing game on your cartridge! Use MROM to archive your game safely and verify your copy. Patchy Matchy can be restored via 29x.
This tool is provided on an “as is” basis, and you assume all risks associated with its use.
IMG_1585.mp4 - H.264 720p
04/2026