Patch to fix the MB-H2 firmware

by gdx on 24-12-2021, 08:55

The original firmware searches if a ROM cartridge is inserted in the slot 1 or 2, if no ROM cartridge is found, the firmware is executed. Which is practical but the secondary slots are not taken into account, so if you insert a disk interface with several functions (memory expansion, megaflash-ROM, etc.), it will not be detected and the firmware will start, which causes a conflict.

You must replace the HN61364P ROM from the mainboard by a 8/16K (e)eprom containing the patched firmware to fix this issue.

AttachmentSizeDownloadsLast download
mb-h2 firmware patch.zip11.49 KB364 weeks 2 days ago