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If you have been involved with retrocomputers for any time, the chances are very high that a machine that worked perfectly when last used has now developed a new fault (or two or more.....).   ...
In the earlier post I wrote about testing an SD-Systems SBC-200 single board computer for the S-100 bus using my Northstar Horizon mainframe. The end result of that testing was that the board seemed ...
One of the challenges with retro-computing is knowing which of the many new/untested components you are trying is causing the headache. My friend Philip was having just this problem with his SD-Systems ...
Restoring vintage computers is sure to mean dealing with old EPROMs.   Many restorers have a modern EPROM programmer (i.e it was cheap, made in China and I got it on eBay) or two but there ...
15. DECUS NOPSIG Posters
(JAQ/BLOG)
The following DECUS NOPSIG posters were produced around 1990.  I was recent given copies in perfect condition so have uploaded them to archive.org as TIFF files suitable for reprinting. Click ...
In mid 2015 I was lucky enough to acquire a Northstar Horizon computer from a fellow collector who was disposing of his equipment.   After seeing my father work with MDL (MicroProcessor ...
There has been much written about IOT (Internet of Things..... devices that we wouldn't initially think of as computers connected to the internet.... smart thermometers, refrigerators, coffee machines, ...
The MS11-JP (M7847-DJ) is a MOS memory board for Unibus PDP11's. In the PDP11/04 I am restoring there are two fully populated boards, each with 32K words of dynamic memory.... and neither board works ...
I have written in earlier posts of my project to interface the FreHD hard disk emulator to my Kaypro 4/83.   The standard Kaypro ROM does not include hard disk support so a third party ROM ...
A while back I was given a Z80 single board computer by Keith (ZL1BQE) when he found out that I really liked the Z80 microprocessor. The board was made in New Zealand by Computer Specialists Ltd ...
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Contact Andrew Quinn

jaquinn@ihug.co.nz http://twitter.com/jaquinn