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L > LITTON - MONROE > OC-8880   


Litton - Monroe
OC-8880

Info needed about this obscure CP/M computer!

Monroe - a subsidary of Litton Inc. - used to produce and sell calculators for years from 1912.

Very little is known about this CP/M system. To use the floppies you had to type in OPEN FPY0:

____________

Thanks to Jan Söderberg for the pictures.



 

The Monroe OC8800 could probably run CP/M, but it was offered with another operating system called OS8MT which was a multi-tasking 8-bit operating system.

There was a Basic interpreter that is related to the Luxor ABC800 series computers and the Diab Basic on the Motorola Unix computers.

There''s even an MS-DOS version of that Basic named basic2pc. There are however some differences in instruction set, but those differences are minor. Search for BASIC2PC.ZIP to find it. The basic is a semi-compiling basic which makes it fairly fast when executing.

One Monroe-specific instruction that I happen to remember is "OPTION EUROPE", which allowed you to programmatically determine if there should be a comma or dot as decimal separator.

          
Friday 16th August 2019
Nils H (Sweden)

Stefano''s link is now broken. I had to move my site, so the link should be http://knut.one/LittonMonroeOC8880.htm and yes the 2KB EPROM is correctly a dump of the boot ROM of the OC8800 but it contains only initialization and ability to load and execute a bootsector from a floppy. Not very useful if you don''t have a bootable floppy for this computer (probably CP/m). I have the machine but no floppy...

          
Sunday 1st November 2015
Knut (Norway)

http://home.online.no/~kr-lund/LittonMonroeOC8880.htm

The MESS project claims they need its ROM dump.
Pehaps the 2kb image in this link is useful ?

          
Tuesday 29th July 2014
Stefano

 

NAME  OC-8880
MANUFACTURER  Litton - Monroe
TYPE  Professional Computer
ORIGIN  Japan
YEAR  1981
BUILT IN LANGUAGE  Unknown
KEYBOARD  Full stroke keyboard with function keys and numeric keypad. 93 keys.
CPU  Z80
SPEED  Unknown
CO-PROCESSOR  Unknown
RAM  16 KB (128 KB max)
ROM  Unknown
TEXT MODES  Unknown
GRAPHIC MODES  Unknown
COLORS  Unknown
SOUND  Unknown
SIZE / WEIGHT  Unknown
I/O PORTS  External disk drive, expansion bus, composite video output (monochrome), AUX serial I/O, COMM I/O, parallel printer interface
BUILT IN MEDIA  One 5.25'' disk drive (300 KB)
OS  CP/M
POWER SUPPLY  PSU built-in
PERIPHERALS  Unknown
PRICE  Unknown




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