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- Path: sparky!uunet!usc!rpi!uwm.edu!ogicse!reed!bowman
- From: bowman@reed.edu (Eric Bowman (bobo))
- Newsgroups: comp.sys.handhelds
- Subject: Re: Information on TRS-80 Pocket Computer wanted
- Message-ID: <1992Aug27.232029.2391@reed.edu>
- Date: 27 Aug 92 23:20:29 GMT
- Article-I.D.: reed.1992Aug27.232029.2391
- References: <1992Aug26.145840.198@sctc.com> <2a9cf560.4787.1comp.sys.handhelds.1@hpcvbbs.cv.hp.com>
- Organization: Reed College, Portland, OR
- Lines: 24
-
- In article <2a9cf560.4787.1comp.sys.handhelds.1@hpcvbbs.cv.hp.com> akcs.mage@hpcvbbs.cv.hp.com (William H. Blohm) writes:
- >If you can provide a manufacturer's logo or some such identifier to
- >show who the manufacturer of the chip set is, you should be able to
- >look it up in their catalog. Might have to look under the replacement
- >for column, though. It is NOT likely to be a bit-slice processor,
- >though. That machine was not that high performance a machine. If I
- >had to guess, I would guess the SC43125 OG 33 were memory.
-
- I'm pretty sure Sharp was using custom processors. At least in the 1500 line,
- they used a custom chip SC???? that was similar to a 8080 (8008?). Then in the
- 1600, they put both their custom chip *and* a Z-80. I suspect the 1211
- also had a custom processor, and is not in any catalog.
-
- In the early 80's people did some sort of cool stuff using the printer port,
- some of which showed up in Pocket Computer Newsletter (anybody remember *that*?
- is Norlin Rober out there?). Pocket Computers didn't really take off until
- Sharp included peek,poke, & call, though. Interestingly enough, the above-
- mentioned Norlin Rober figured out the PC-1500's custom chip instruction set
- empirically, using peek, poke, & call. A monumental achievement, believe me.
- Naturally Sharp published the op codes shortly thereafter.
-
- later,
- bobo
- bowman@reed.edu
-