On 06/16/2012 07:52 PM, Bil Herd wrote: > Yep, seemed designed for a whole byte of data in that number of pins. Kind > of glad they didn't try to embed more functionality by any kind of pin > re-use or processor controlled commanding, would have been harder to use > as a TTL'ish part. That reminds me... If I remember right, the 6529 used for the keyboard port in the 264 series is only written to, never read (Correct me if I'm wrong). That should make it possible to use a 74LS574 or the like on a small adapter instead. Maybe with series resistors of a few Ohm on the output pins. If I'm wrong an it's also read, it will be a bit more complicated and need a bit of extra logic So far I haven't seen a dead 6529 anywhere, seems to be a very stable chip, but it would be nice to have a generic replacement available. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2012-06-17 16:00:05
Archive generated by hypermail 2.2.0.