Author Archives: Andrew

7 segment display decoder with HEX output

In seeking to improve my ISA POST card design, I became frustrated at the general lack of modern seven segment display decoders that could decode and display a hexadecimal output. Rather than buy an older second-hand decoder IC, I fell … Continue reading

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New Github

I’ve had a recent reader comment asking for me to share the details of the Keystone 9202 bracket that I’ve used in my ISA POST card design. This has prompted me to create a proper place on my Github account … Continue reading

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Retro-CGA #6 – Character Font

The last post in this series covered the receipt of the Retro-CGA prototype circuit boards, and the soldering of all components onto one of the boards, making a completed prototype card: This post covers the last step in preparing the … Continue reading

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Retro-CGA #5 – Fabrication and Assembly

The last post in this series showed some of the detail of the Retro-CGA as it has come together so far, and ended with the preparation of Gerber files in preparation of having some prototype boards fabricated. After a week … Continue reading

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Retro-CGA #4 – Design Features and Fabrication

The last post on the Retro-CGA showed the gradual progression from schematic design to  board build-up, summarising a period of several busy weeks. This post acts as a summary of that whole exercise, showing some of the board design detail. … Continue reading

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Retro-CGA #3 – Initial Board Design

The last post in this series covered aspects of the initial schematic design of the Retro-CGA. This post will crack on with the initial board design, using the magic of pictures to show the detail of the board build-up. I … Continue reading

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Retro-CGA #2 – Initial Schematic Design

In one of my last posts I pondered the journey required to create an open-source video card inspired by the CGA card that I had repaired, in an attempt to preserve its historically-significant legacy. In this post I will share … Continue reading

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Retro-CGA #1 – Starting the Journey

If you have been following the ongoing saga of my CGA card, you would have seen the recent progress in repairing the extensive damage to the card, and getting the card running with Sergey’s Micro 8088. Although I haven’t yet … Continue reading

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Learning KiCad; Designing and Building an ISA POST Card

The last post in my series on retrocomputing covered the testing of my repaired CGA with the Micro 8088. The process of troubleshooting took several weeks, and it became apparent that a handy piece of hardware to have would be … Continue reading

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Testing my repaired CGA with the Micro 8088

After repairing my CGA video card, and building Sergey’s Micro 8088 processor board and ISA 8-bit Backplane, I am now in a position where I should be able to test the combination of cards and verify if the CGA video … Continue reading

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