Wednesday 22 Nov, 2017
Welcome to RISCOS.org
Jump to 
Search Articles 
Search for Software 
 

Acorn Second Processors

A second processor was the generic name for a range of parasite processors that could be linked to Acorn's original 8 bit machines via what was called the 'Tube' interface. Basically the host machine became dedicated to handling the Input and Output while the second processor would do the higher level functions (like running your programs).

The second processor ran asynchronously to the host processor allowing incredible increases in execution speed for programs. A wide range of processors were supported this way allowing Acorn's eight bit range of machines to remain viable and useful for much longer than their technology would suggest.

The Second Processors that existed are :-

Z80 second processor.

6 MHz RAM.
64k Memory.
CP/M OS.
External second processor for all eight bit machines.

6502 second processor.

3 MHz RAM.
64k Memory.
Extended version of the BBC MOS.
External processor for all eight bit machines.

32016 second processor.

6 MHz RAM.
256k-4096k Memory.
Panos.
External processor for all eight bit machines.

ARM 1 second processor.

4 MHz RAM. (At a guess...)
4096k Memory.
Brazil OS.
External processor for all eight bit machines.

6502 co-processor. (internal second processor)

4 MHz RAM.
64k Memory.
Extended version of BBC MOS.
Internal processor for Master 128 machines but could be fitted external to the other eight bit machines.

80186 co-processor.

10 MHz RAM.
512k Memory.
DR-DOS+ with GEM.
Internal processor for Master 128 machines but could be fitted external to the other eight bit machines.

Add a comment to this article

If you wish to add a comment to this article, please use the form below. Please note that by submitting comments using this form you are allowing all of the information submitted to be visible on this website. Your comment will be published immediately, so please proof-read before you add. Any comments deemed to be abusive or irrelevant to the topic of the article may be removed without warning.

Posted by: (optional)

Email or web site: (optional, emails will be mangled to avoid spambots)

Comments: (maximum length 2000 characters)

If you would like to add a URL to another site, please enter the address (without http://) inside square brackets. Use an optional closing curly bracket to add a description. eg. to link to http://www.vigay.com enter [www.vigay.com}Vigay.com]

To prevent spambots, please re-enter the following code:
*****


Email Email this page to a friend

 Last edit: 10th Apr 2016 at 4:55pm (591 days ago)

Bookmark with:What are these?
delicious Deliciousdigg Diggreddit redditfacebook Facebookstumbleupon StumbleUpon

RSS Feed 

^
 
Valid HTML 4.01!
Valid CSS!
Best viewed with a cup of tea Crafted by RISC OS