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From: fzsitvay@techbook.com (Frank Zsitvay)
Newsgroups: comp.sys.tandy
Subject: Re: Model 100: How to interface with system bus?
Keywords: Model 100, system bus, peripherals
Message-ID: <1991Mar7.193029.11712@techbook.com>
Date: 7 Mar 91 19:30:29 GMT
References: <23244@well.sf.ca.us> <1991Feb10.203444.18109@daffy.cs.wisc.edu> <1991Mar5.130348@snoc01.enet.dec.com>
Organization: TECHbooks of Beaverton Oregon - Public Access Unix
Lines: 26

In article <1991Mar5.130348@snoc01.enet.dec.com> cameronjames@snoc01.enet.dec.com (James Cameron) writes:
>writes:
>
>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.

   well, you have several options.   you can still use a z80sio if you
demultiplex the address and data busses.

   or intel may have developed a serial chip designed to work with that
processor directly.  they did produce a parallel chip, the 8155, that
had i/o ports, timers, and other stuff, so there is probably a serial version
of it out there.

   or, use the nsc800 version of the z80sio, which is designed to work with
the nsc800 processor (a cmos z80, with enhancements, and designed to look
like an 8085) but will work with the 8085 directly, since it can handle
a multiplexed bus.

-- 
fzsitvay@techbook.COM - but don't quote me on that....

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