uhclem@nemesis.UUCP (03/18/91)
<> >Me too. I want to make a MIDI interface. I intend to model it on the design >published in the MISOSYS Quarterly (V.i) for TRS-80's. I need to know what I/O >controller chip I can use to replace the Z80-SIO that that design calls for. >The 80C85 processor on the Tandy 102 that I have uses a multiplexed address and >data bus. You can use either a Zilog 8030 or a 8530 (I think it's the 8030, but my data sheets are not available right now). The 8030 handles a multiplexed bus, while the other wants a de-multiplexed bus. The 8030/8530 (also called Z80-SCC) are supersets of the Z80-SIO, in that the first 8 registers are identical to those in the SIO. The additional registers allow you to fancier modes SDLC, NRZI,NRZ encoding, etc. Frank Durda IV <uhclem@nemesis.lonestar.org>|"How do I know? Well, I designed ...letni!rwsys!nemesis!uhclem | a multiport serial and a mini-net ...decvax!microsoft!trsvax!nemesis!uhclem | board using the 8030/8530."