> >> What is the pinout of the userport regarding datalines only, is it C64/V20 compatible? > > > >RS232 is operated via a 6551 (aka swiftlink) chip in the plus 4, and > This must be only for the lines related to the RS-232 which are software controlled on the C64... so modems are compatible, but I'm specifically interested in where the lines for the 6529 come out for an 8-bit interface > > Now that I remember my other, what is the bit assignment for the IEC > lines? I recall that they got to the on-CPU I/O port. On the C128, 'slow' serial is handled by the same lines as on the C64, $DD00 bits 7-3 (ATN, clock out, data out, clock in, data in, in that order). 'Burst' Serial is handled by a hardware serial shift-register, specifically $DC0C, CIA #1 Serial Port, along with the 'CNT' (hardware clock) line associated with it. These are CNT1 (pin 4) and SP1 (pin 5) on the user port, which I didn't list earlier. I forget if 'Fast' Serial mode is handled by software or by hardware assist. -- ___________________________________ _____ _____ | _///@@@| | | firstname.lastname@example.org /'//ZZ@@|____ | | |'''/ |'/@7 | | http://home.kscable.com/natedac |`'| `~~' | | | `| .--. | | C64/C128 - What's *YOUR* hobby? | `\____|___\ | | \_ | | |___________________________________ \_____| _____| - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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