Since this mail bounced, I repost it... > > Hi, > > > > "Professor Dredd" <profdredd@yahoo.com> wrote on Friday, May 04, 2001 11:26 > > PM: > > > > > R6510 is a 6-bit bi-directional I/O port on the 6510 > > > chip. Bits 0-2 of R6510 control the banking inputs of > > > the PLA. -RESET forces the port to input mode and > > > clears the port data to $00 (just like the 6526). Then > > > the pull-up resistors bring the port to output mode > > > (referring to all 6 lines) > > > > No, the pull-up resistors don't bring the port to output mode; they just > > insure they have H-level when the port is in input mode. The kernel itself > > sets the port to output mode. Ruud explained it correct, but you seem to > > have misunderstood him. > > > > > So, if I'm writing my own KERNAL, I can expect the > > > following conditions after every -RESET: > > > > > > PLA configured to ROML/ROMH/IO > > > D6510 = all outputs > > ^^^^^^^ > > all inputs! > > > > > R6510 = $00 > > > > > > > Hmm ... there seems to be a conflict here ... :-/ > > > > I hope I have clarified this! Greetings, Spiro. - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi.
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