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...  This happened to me recently with a TRS-80 Model 1.  In the time I have had the machine it has been very reliable.  I pulled it out of storage after 6 months to do some testing with the ...
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 ...
... SBC-200.  The SBC-200 is a Z-80 based single board computer for the S-100 bus as is described on www.s100computers.com Philip had spent a couple of months trying to get either of his ...
... is a very good chance that neither will write (or even read) older parts even if the "supported parts list" suggests they will. I ran into this problem with the 2708 EPROM on the Northstar ZPB Z80 ...
11. 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 ...
Fred Vecoven's FreHD Hard Disk emulator has been a very popular upgrade for TRS-80 Model 3 and 4 users since its launch in 2014.   If you have a Model 1 with a Radio Shack expansion interface ...
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 ...
... KayPlus ROM worked but there were a few odd behaviours running some CP/M applications that needed further investigation. In May 2014 a Kaypro II was purchased from eBay by phorgen on the Vintage Computer ...
A few years back I built a QRSS transmitter (for slow morse and WSPR) based on a recycled DLink DSL-502T router running OpenWRT and connected to an Si570 DDS module. (http://www.quicktrip.co.nz/jaqblog/home/44-si570qrss) ...
Following on from the post about the Model 4 FreHD installation, here are a few pictures showing the installation of a FreHD Hard Disk Emulator in my TRS-80 Model 4P. The mounting chassis is the ...
A few pictures showing the installation of a FreHD Hard Disk Emulator in one of my TRS-80 Model 4's. The mounting chassis is the frame from a dead Seagate ST4766N hard drive.  I picked ...
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 ...
20. M9301 Repair
(JAQ/BLOG)
The M9301 is a ROM/Terminator board for Unibus PDP11's.  In the PDP11/04 the PROMs on this board provide the boot loader and programmers console code. The PROMs are mapped into two address ...
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Contact Andrew Quinn

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