>>>>> "RB" == Ruud Baltissen <Ruud.Baltissen@abp.nl> writes: RB> If the Max has only one CIA, at what address does it show up? The RB> C64 has two CIA's. Remove the "keyboard"-CIA, and you have no RB> interrupt: cursor does not blink. Remove the "drive"-CIA and you RB> have no normal screen as this CIA steers two lines of the VIC. RB> Presume the CIA of the MAX is the "drive"-CIA and the rest of the RB> hardware (addresses and wiring) is the same, you only have to RB> "move" the interrupt by replacing the addresses of the used timer RB> by the ones of the "drive"-CIA. I'm pretty sure the MAX has the $dc00 CIA but not the $dd00 CIA -- the VIC address lines are just kept low, as it can only address 16K of RAM. The rest of the stuff in the $dd00 CIA is useless in a MAX as it doesn't have a serial or a user port. -- ___ . . . . . + . . o _|___|_ + . + . + . . Per Olofsson, konstnär o-o . . . o + MagerValp@cling.gu.se - + + . http://www.cling.gu.se/~cl3polof/ - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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