On 4/21/17 9:10 AM, Gerrit Heitsch wrote: > Take a look at the MOS datasheet for the 6522 (If you can't find it, I can > mail it to you), it has schematics for the port drivers for port A and port B, > they differ, but both ports have a permanent pullup in form of a MOS > transistor for each bit. The MOS 6522 datasheet can be downloaded from here: http://6502.org/documents/datasheets/mos/ The port drivers are on page 3 of the PDF. The Rockwell and Synertek 6522 datasheets are also on 6502.org. Regards, Mike -- Mike Naberezny (email@example.com) http://6502.org Message was sent through the cbm-hackers mailing listReceived on 2017-04-21 18:00:02
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