Hello! Mia Magnusson wrote: > I really don't understand why this sram is there at all instead of just > map a part of the 64k dram in bank 0 as a 1k window in bank 15. What I think personally is that the memory map pf the P500 is influenced heavily by the map of the B series. And in the B series, you _cannot_ have DRAM mapped to bank 15, because you need a place for the 6509 to live when 8088 has access to DRAM. > Someone who were any good with software should had pulled some > emergency break before they actually sent the 6509 into production :) You are demanding common sense from Commodore? ;-) > What they could had done is fill all non-rom non-i/o parts of bank 15 > with a mirror of bank 0. But the problem is that bank 15 is almost entirely composed of ROM and I/O. There is 24 kB of ROM, another 28 kB for cartridges, 4 kB of I/O, 2 kB of screen memory (plus another 2 kB in the P500) and... not much space for anything else. Regards, Michau. Message was sent through the cbm-hackers mailing listReceived on 2018-03-06 23:05:15
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