SCC2691 ACIA or UART

JMP $FCE2
gwkaub
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Joined: Fri Aug 15, 2014 10:29 pm
Location: Washington

SCC2691 ACIA or UART

Post by gwkaub » Fri Aug 15, 2014 10:50 pm

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



satpro

Re: SCC2691 ACIA or UART

Post by satpro » Fri Aug 15, 2014 11:21 pm

You ought to PM jrubin. He uses an ACIA for controlling his ham radio and might be able to help.

gwkaub
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Posts: 2
Joined: Fri Aug 15, 2014 10:29 pm
Location: Washington

Re: SCC2691 ACIA or UART

Post by gwkaub » Wed Aug 20, 2014 8:10 am

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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