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Path: utzoo!mnetor!seismo!lll-crg!nike!ucbcad!ucbvax!hplabs!tektronix!reed!iscuva!jimc
From: jimc@iscuva.UUCP (Jim Cathey)
Newsgroups: net.micro,net.wanted
Subject: Re: Info wanted on Ohio Scientific micro
Message-ID: <246@iscuva.UUCP>
Date: Thu, 14-Aug-86 11:47:07 EDT
Article-I.D.: iscuva.246
Posted: Thu Aug 14 11:47:07 1986
Date-Received: Sun, 17-Aug-86 05:31:29 EDT
References: <119@unx1.UUCP> <96@eneevax.UUCP>
Reply-To: jimc@iscuva.UUCP (Jim Cathey)
Organization: ISC Systems Corporation, Spokane, Wa.
Lines: 48
Keywords: memory,8bit,Ohio
Xref: mnetor net.micro:5850 net.wanted:3676


In article <119@unx1.UUCP> qsfa1@unx1.UUCP (Graham Thomas) writes:
>
>A friend of mine has just inherited an ancient micro and would be
>grateful for any information (especially a memory map) that anyone
>can provide.  It's 6502-based and was made by Ohio Scientific, though
>there's no model name visible.  It has a whole 24k of RAM and twin
>8-inch floppies.  The only software he's got for it is a BASIC
>interpreter, a database program that's only good for address files
>and a primitive word processor.

It sounds like a C2-8P DF unit.  Ick.  I myself owned a C1P and only know
about the C2 because of porting programs from it.  I assume your beast
has the built-in keyboard and video and was not one of the early terminal
based ones.

Quick and Dirty Hardware (jes' like me ;-) ) memory map (let me know if
you want more, I may be able to resurrect some stuff from my files...)

0000-0100  Page Zero, lots of interesting stuff here related to BASIC...
0100-0200  Stack, and probably the Software INT and NMI vectors, they were
           at $0130 and $01C0 on the C1P
0200-0300  In the C1, this was scratch ram, but the C2 may have added it
           to the next entry...
0300-C000  RAM, depending on how much you had.  BASIC sat in the bottom,
           DOS just above it, and your programs started somewhere at 31xx.
C000-D000  Disk I/O chips (6850 and 6821)
D000-E000  Video RAM, only 2K on the C2.
E000-F000  Unused, or maybe something I've forgotten about.
FC00-FD00  ACIA ports
FD00-FE00  Keyboard.
FF00-FFFF  Boot ROM.

Hope this helps.  The OSI computers were somewhat ahead of their time
at introduction, and very fast compared to their competitors.  They
failed completely to grow, most particularly in the software
department.  I think they ended up being laughed out of existance.  ;-)

-- 

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! II      CCCCCC !  Jim Cathey
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! II      CC     !  Spokane, WA
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