UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Computers

Notices

Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment.

Reply
 
Thread Tools
Old 3rd Oct 2020, 8:34 pm   #1
Cobaltblue
Moderator
 
Cobaltblue's Avatar
 
Join Date: Dec 2010
Location: Exeter and Poole, UK.
Posts: 4,017
Default Fairchild F8

Back in the late 70's I had several involvements including building a PC from scratch using the Fairchild F8.

It was also used in amusement machines especially one arm bandits.

I did a nice little side-line at that time repairing and reprograming amusement machines.

Anyone else do anything with the F8?

I am hoping as I re-enter my stores I will find my F8 stuff.

Cheers

Mike T
__________________
Don't care if it was a bargain why's it in my kitchen
Mike T BVWS member.
www.cossor.co.uk
Cobaltblue is offline   Reply With Quote
Old 3rd Oct 2020, 9:00 pm   #2
Slothie
Heptode
 
Join Date: Apr 2018
Location: Newbury, Berkshire, UK.
Posts: 543
Default Re: Fairchild F8

I remember raking through some boards at a computer junk shop (Display Electronics) in Ilford back in the 80s and finding a circuit board that the guy there said was an "F8 CPU board" but as I hadn't heard of it at the time I put it to one side. Which at the time was wise because getting any data on it in the pre-internet years would have been unlikely. I instead picked up a 6800 based board from a point of sale terminal which had an intriguing number of big support chips (probably 6820 PIA's) memory and EPROM. I never really got it to do anything much and I wish I could find it now because now I have an EPROM programmer, time and knowledge!

Theres a F8 card pulled from a communications reciever on eBay now, selling for $100 so if you do find yours look after it! It surely must be very rare.
Slothie is online now   Reply With Quote
Old 3rd Oct 2020, 9:03 pm   #3
G6Tanuki
Dekatron
 
G6Tanuki's Avatar
 
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 8,975
Default Re: Fairchild F8

I built some agricultural data-collection gear using the F8; back in the late-70s the idea of counting/weighing pigs as they fed was kinda novel !

[The in-the-pigshed bit used the F8 and battery-backed CMOS RAM chips to store the data, which was then uploaded to a PDP11 when the in-the-pigshed bit was taken back to head-office at the end of the week].

I remember some fun because the F8 had to drive a 4-digit 7-segment multiplexed display from software, and when an interrupt came along the display was 'stalled' while the interrupt was serviced - this meant whichever segments on the poor little calculator-style 'bubble' display were lit at the time stayed turned-on - and passing a high current - for the duration of the interrupt-service routine. We had problems with segments going-dim through overdrive: I rewrote things so when the interrupt arrived there was a little routine which was called to 'flush' the display-drivers to all-segments-off before servicing the interrupt proper.

Ah, all now lost in time.
G6Tanuki is offline   Reply With Quote
Reply

Thread Tools



All times are GMT +1. The time now is 1:39 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Copyright ©2002 - 2020, Paul Stenning.