On 4/19/2019 10:29 AM, Mia Magnusson wrote: > Den Thu, 18 Apr 2019 16:56:32 +0200 skrev Michał Pleban > <lists_at_michau.name>: >> Jim Brain wrote: >> >>> So, hide the registers in '816 mode? >> For me it makes the most sense to hide them. > I'd say that the important thing is to hide them from reads. It would > probably not matter if they listen to writes or not, as long as the > writes also goes to regular memory and also long as it's consistent > (i.e. once it's a product ready for consumption by anyone this shouldn't > change as that might cause confusion). I had to go check the code to be sure, but currently, all writes go to the bus, regardless of state. However, it does raise the question of whether the real 6509 places the address or data or a proper r/w signal on the bus during a read or write to $0 or $1. Michal?Received on 2020-05-29 21:29:36
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