On 2/24/2018 9:19 PM, Dr Jefyll wrote: > Dr Jefyll wrote >> We can't have >> read data from memory at $0000 or $0001 /also/ attempting to drive the >> bus. > Huh -- or maybe we CAN! The question is, are /writes/ to $0000 and $0001 > also passed on to RAM? With the present arrangement I think they are. That > means it's OK to have two bus masters later when the read occurs, because > the data will be the same! I was going to response earlier. I don't think it is a problem. If there is no RAM at 0/1, then the CPLD owns the bus. If there is RAM at 0/1, then the CPLD and the RAM will both own the bus, but there will be not a major problem, The only issue is if there is ROM at 0/1 > > But is the present arrangement acceptable? I heard some discussion somewhere > about writes to $0000 and $0001 /not/ being passed on to RAM. Is that a > desirable thing? Here's where my lack of CBM knowledge becomes apparent... This is an issue with the 6510, where the parts are truly internal, and no external write is asserted > :o/ > > cheers, > J > > > > -- > Sent from: http://cbm-hackers.2304266.n4.nabble.com/ > > Message was sent through the cbm-hackers mailing list -- Jim Brain brain@jbrain.com www.jbrain.com Message was sent through the cbm-hackers mailing listReceived on 2018-02-25 06:00:24
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