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From: chm114u@vaxc.cc.monash.edu.au
Newsgroups: comp.sys.apple2
Subject: Re: Retro Computing, A/D and MIDI
Message-ID: <36876.26b0e515@vaxc.cc.monash.edu.au>
Date: 27 Jul 90 15:06:29 GMT
References: <8088@ccncsu.ColoState.EDU>
Organization: Computer Centre, Monash University, Australia
Lines: 31

In article <8088@ccncsu.ColoState.EDU>, johnk@loki.atmos.ColoState.EDU (John Kleist) writes:
> I recently (re)acquired an Apple ][+.  My intent was to build a camera
>     [some interesting stuff deleted]
> I am now considering using it as a MIDI device.  This would involve adding
>     [more interesting stuff deleted]
> 1) Has anyone built a A/D device for their Apple?  I need 8 or 16 channels
> of 8-bit conversion at a moderate sampling rate, <1 khz.  What chips are
> easy interface to a 6522 VIA?
>
       Well, I've used an ADC0809, 8 channels, 8 bits, your programming
       will probably be the sampling time limit. A 6522 VIA and about
       seven 74series ttl logic chips and a handful or so of capacitors
       should round out the device. There are other adcs around that will
       (make that should) work just as well.
>
> 2) Which of the MIDI interfaces will work with my Apple ][+?  Are these easy
> to build?  Do the commercial ones buffer incoming MIDI messages?  Is MIDI
> interface programming similar to serial port programming?
>
       I haven't the foggiest notion!

> 3) Do these ZIP chip things really work?  What is the REAL speed up factor
> on REAL programs, say a BASIC program?  Do they somehow speed up memory
> access time as well as CPU cycles?
>
       I really liked my zip chip (when it finally arrived) but my GS arrived
       two weeks later.
>
> John Kleist     johnk@loki.atmos.colostate.edu

        Mike.