I'm continuing to have issues trying to access the 32K ROM / RAM on the MSX2 Utility board. There seems to be a pretty basic issue with the design. The 8255 A port need to be configured to enable slot 0 where the EPROM and RAM are mapped. To configure the 8255 I need to be able to run code in the EPROM; I can't however access the EPROM because the 8255 isn't configured. Any suggestions? -Neil
> Interesting request Neil. Never tried that one. What exactly are you > trying to do. Do you want to boot from an external ROM at 0H or somewhere > else. > There probably is a way to fool the Z80 to boot externally. Remember U18 > forces NOP's on the bus (up to the required boot address). I think if you > remove it (and the ROM itself) you may end up booting from 0H. However > never tried that. Let's know how it works out. > > John > > > -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
