Most of the times it will work. At least I have "changed" the original MSX2 BIOS ROM (32 KB) of two Philips machines, NMS-8235 and NMS-8245 with a MSX BIOS ROM from a Sony HB-75 and it worked really fine. And both machines have got mapper.>Hi again, Hi,>Ok. How about this? >I have a MSX2 machine and replace MSX2 BIOS ROM with MSX BIOS ROM. >Then does the MSX2 machine work? It'll depends on what is the hardware of this MSX2. If it has Mapper, it may not work, since MSX1 BIOS do not set mapper. Also, if this machine has different VDP ports everything will be messed up.
I will hang. It will look for MSX2 SUBROM and it will fail. The same for clock access and VDP operations.>How about in the reverse case (MSX2 ROM to MSX machine)? Then I think it'll hang on boot. MSX2 BIOS will probably look a lot of things that do not even exist on MSX1 (it will read the clock, set VDP palette, etc)
Ok, that's true, but anyway I think that the system will be able to boot, despite doing weird things afterwards.>Another case: >I have two different MSX2 models, and if I replace their ROMs with each >other, then do they work? Maybe yes, maybe no. Supose you have a Japanese MSX2 and a European MSX2. If you exchange their roms, at least, the keyboard will start to act weird... because their are probably a lot different if you look at the key matrix.
Ed Robsy
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