SCC2691 uart or acia

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gwkaub
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SCC2691 uart or acia

Post by gwkaub »

Has anyone got one of these wired up and programed on a C64 or C128?
I can enable chip and write(WRN), but the read enable(RDN) is not simple thing to get working.
I am trying to connect directly to buss. I don't want to go thru an interface chip to talk to this interface chip.
thank you
gwkaub
Posts: 2
Joined: Fri Aug 15, 2014 1:36 am
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Re: SCC2691 uart or acia

Post by gwkaub »

Ok its a timing problem. The 2691 calls for RDN to go low with CEN low if I do both at the same time it doesn't work.
I asked for a quote from some obsolete parts places for going back to R6551.
The one quote back from 4STAR $20. With all this work for obsolete parts I think I will just go
with something new I can program as a UART. The Parallax Prop chip at $8 will give me lots of options. I have done projects
with the Prop before. I was thinking it was overkill, but keeps things interesting.
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