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Chuck(G)

  1. Cloning a PAL/HAL (Part 1)

    I'll be posting this in pieces because I want to take the time to make it understandable.

    So, what's a PAL?

    PAL stands for Programmable Array Logic and is a type of integrated circuit that consists some simple logic that can be connected via a programming procedure, much like a PROM. Connections are made by "fuses" in a metal overlay that can be "blown" by a device programmer.

    A variation of the PAL is the "HAL", which is ...

    Updated June 12th, 2019 at 10:02 PM by Chuck(G)

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  2. Modifying an IBM 4869 external floppy box, Part 2

    Okay, now replace the cable retainer (all plastic), making sure to press firmly along its entire length to make sure that all wires have been pierced by the insulation-displacing contacts and that the retainer latches into the connector body:
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    Fold the cable over the connector body as it was originally, and replace the strain relief. You may need to bend the ears slightly together to get the relief to latch over the retainer. You'll probably have ...

    Updated March 16th, 2019 at 03:07 PM by Chuck(G)

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  3. Modifying an IBM 4869 external floppy box to work with a 5150

    ...or any other standard floppy controller with an external drive connector (it works fine on a Compaticard, for example).

    First, take your 4869 apart. Note that there are 8 screws on the bottom and that 2 of these are tamper-proof Torx-head screws. Fortunately, it's easy to find screwdriver bits for these tamper-proof screws, which makes them not so tamper-proof. Note which holes belong to which screws. The Torx head screws are longer than the others and will enlarge the other ...

    Updated March 16th, 2019 at 03:03 PM by Chuck(G) (Update image links)

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