Mark's Ohio Scientific/Compukit UK101 Archive
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Ohio Scientific Inc. began in Hiram, Ohio around 1975. They were the
first company to provide systems with Microsoft's floating point BASIC in ROM
(1977), and by the time the company was sold in 1981, they had produced a
number of systems
both popular with hobbyists
and used in small businesses.
A fully expanded OSI system included options for home automation using a BSR
X-10 AC interface, home security using a number of switch & sensor inputs,
speech synthesis using a Votrax module, and DTMF decoding for phone
applications. Storage started with inexpensive standard audio cassettes, the
more advanced 5.25 or 8" floppy disk storage, or even a Winchester hard disk
storage system. I/O included A/D, D/A converters, joystick, serial & parallel
ports, EPROM programmers & prototype boards. Business systems could include a 3
CPU processor card which could run 6502, 6800 or Z80 software on a time share
system with 16 terminals.
The UK101 was a version of the OSI 600
Superboard, similar to the one shipped in the C1-P, modified for use in the UK
and Australia. The hardware was nearly the same, the system and BASIC ROMS
began as modified versions of the OSI ROMS.
Thomas Buescher has a written nice OSI history overview
here. Browse an OSI product pamphlet page
My introduction to OSI came in 1978, I was fortunate to get a C2-8P system,
which looked something like
this. It had an OSI 500 CPU board with 4K of 2102 static RAM 1Mhz 6502
& BASIC in ROM, a 540 monochrome composite video board with 2Kx7bit RAM & a
64x32 display + cassette interface, and a 420C 4K static RAM board using 32
2102A 1Kx1 static RAM chips, and a 9" B/W composite monitor. Total price was
nearly $2000. Today you can emulate this system for free on your PC!
Emulator & Tools
This WinOSI Emulator is a rewrite of a UK101 emulator started by Ian
McLaughlin at www.compukit.org, later
modified & supported by Thomas Buescher at
This version contains many changes and enhancements, including color support,
32/64 character wide screen support for C2/C4/C8 systems, and Tape & Disk image
support. I wouldn't consider it complete yet, but it's probably further along
than any other OSI emulators I've seen. Updates, enhancements, suggestions
Last update Oct-02-2008
|32Bit Version for Windows 95+/NT+|
|Click for larger view.
Emulator Files. See note at bottom before downloading.
|The WinOSI Emulator for Win32
(Win9x/ME/NT/2K/XP), including BASIC and system ROMs, disk image, basic &
machine programs, souce code, reference & tools. Supports 5.25 & 8 inch floppy
disk images, and cassette.
Includes projects for MS DevStudio 6 and the free
Borland 5.5 C++ compiler with the
|The WinOSI Emulator (same as above)
in a self extracting archive!
||OS65D V3.3 disk images for C1PMF
Zip archive file: You will need to download a
zip archive extraction utility such as WinZip, available at
http://www.winzip.com In order to extract these archives.
I had a hard time deciding what to do with these old copyrighted pieces of
historical computing. I don't intend to infringe on the copyright or
intellectual property rights of their owners, and will remove any file, or get
the appropriate permissions, if the owner can be found. You are of course
entitled to these files if you own the actual hardware.
All copyrights of any third parties referred to herein are
hereby acknowledged. There is no warranty, either expressed, or implied,
relating to any of the content contained herein.
You may use the information contained herein for NON-COMMERCIAL purposes
only and AT YOUR OWN RISK.
Ohio Scientific board image catalog
Stay tuned for updates!
Text file containing a list
of known OSI hardware.
Usenet message outlining the
Kansas City Standard Cassette format which was used by OSI. (Don't miss Ed's
I am on the lookout for anything I can add to the OSI archive. Including:
OS-65D & OS65U operating system for 8" drives.
Any DOS versions for C1P/Superboard/UK101.
Enhanced operating system ROMs C1S/C2S etc.
Any information/schematics/software for the Winchester Hard Disk subsystem.
Any other software made for OSI/UK101 systems.
Dave's OSI repository
featuring message boards, scans & manuals.
Compukit UK101 Home Page featuring
an OSI emulator for Windows, scans & manuals.
Ed's DX-Forth and
Utilities Page includes a Kansas-City Standard audio decoder/encoder,
which can convert sampled OSI tapes to binary.
Ohio Superboard II
Emulator Homepage Thomas Buescher's WinOSI project, the genesis of this
Challenger 1P emulator & manuals
Mark S. Csele's Superboard web page including OSI pictures &
The 6502 resource page An
archive of all things related to the 6502 microprocessor
your own UK101 with 11 ICs
Workshop Comupter corner part 3 features pictures of an OSI 400 Series
You can send me feedback at if you wish. Spam is not appreciated which is why the link is spelled out. :-(
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