zznop / ida-sms Goto Github PK

The script is loading only the first 48K of ROM, but most cartridges are 128K (256K and 512K are also possible). I'm pretty new to IDA so I don't know if there is a smart way to make all of the ROM available since the SMS uses bank switching to address more than 64K of memory.

The perfect layout would be: Map the first 32K as ROM (0000-8000h), add 8K RAM (C000-DFFFFh) and 8K shadow (E000-FFFFh), and map everything above 32K in 16K chunks/banks (for 128K, that would be BANK0 to BANK5), all from 8000h-BFFFh. AFAIK, this is what most games do (keep the first 32K resident and bank switch the rest) and also what is shown in the official documentation. But I'm not sure IDA is clever enough to support something like bank switching in disassembly. It would need to understand writes to FFFFh.