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 (IC34) from the mainboard by a 8/16K (e)eprom containing the patched firmware to fix this issue.
| Attachment | Size | Downloads | Last download |
|---|---|---|---|
| mb-h1 firmware patch.zip | 746 bytes | 35 | 3 weeks 4 days ago |