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JAQ's Blog - Electronics, Microcontrollers, DEC Minicomputers, Raspberry Pi, Airplanes and other stuff....
Total: 14 results found.
TRS-80 Model 1 Keyboard Repair
... Model 1
Interface and found that the Shift Keys had stopped working. Failure of individual keys is a pretty normal occurance on machines this age. Failure of a single ...
TRS-80 Model 1 FreHD Expansion Interface
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 ...
Kaypro 4/83 Floppy Disk Woes.....
I have written in earlier posts of my project to interface the
hard disk emulator to my Kaypro 4/83. The standard Kaypro ROM does not include hard disk support so a third party ROM ...
TRS80 Model 4P FreHD Installation
Following on from the post about the Model 4
installation, here are a few pictures showing the installation of a
Hard Disk Emulator in my TRS-80 Model 4P. The mounting chassis is the ...
TRS80 Model 4 Internal FreHD Install
A few pictures showing the installation of a
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 ...
Kaypro / FreHD Adaptor - Part 3
A friend from out of town was visiting so he was able to being his Kaypro II with him to we could try the Kaypro '83
SHIM adaptor. The physical arrangement of the Kaypro II PCB (81-110-n) ...
Making ROMs with SRECORD
The Kaypro /
adaptor uses a 28C256 EEPROM chip that contains multiple ROM images. The active image is controlled by jumpers on the high address lines. The challenge I had ...
Kaypro / FreHD Adaptor - Part 2
Following on from the post about the development of the Kaypro /
adaptors this post covers the SHIM board that I designed for the Kaypro 4/83 (81-240-n). Design objectives for the board were ...
Kaypro / FreHD Adaptor
The thing that struck me when I initially got involved with Fred Vecoven to test the
was the potential for the device to be used on machines other than the TRS-80. The
System 80 / FreHD Adaptor
... design. This is particularly true for the expansion bus on the back of the machine and the design of the expansion interface. This difference in expansion design means that the
TRS80 Model 1 Fixup - Part 3
So with a power supply, working power switch, restored Expansion Interface and a suitable case, things were looking good for a quick test of the Model 1 /
adaptor and move on to the next project. ...
TRS80 Model 1 Fixup - Part 2
Included in Ian's box of "things from the junk box" for
testing was a Model 1 Expansion Interface PCB. Ian tells me that a common problem is people shipping Expansion Interfaces with ...
TRS80 Model 1 Fixup - Part 1
With the success of the
on the TRS-80 Model III and 4 it was time to start testing on the Model 1. The first step was finding a Model 1 and Expansion Interface. While they may ...
TRS80 Model 4 128K Upgrade
... with modern accessories like the
but still retain as much of the original operating experience as possible. Both my machines are in the "standard" New Zealand 64k configuration and I don't ...
PDP8 SBC6120 FP6120
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