A Macintosh PDS DOS Compatibility card extender that allows you to use the DOS card in computer like the Quadra 700 and Quadra 950.
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Replacement Extender Card for Apple DOS Compatibility v 1.0

PDS DOS Compatibility Card Extender

This repo includes the original PDS DOS Compatibility Card Extender made by tomytronics on reddit called Replacement Extender Card for Apple DOS Compatibility v 1.0.

It was inspired by the original Reply Extender Card.

Reply Extender Card

This allows you to use the Houdini I and Houdini II PDS DOS Compatibility cards in computers like the Macintosh Quadra 700 and Macintosh Quadra 950.

Notes from tomytronics for his design

"My original design fits perfectly but is prone to interference without wrapping them in foil and connecting them to ground screws."

"You are free to upload the original and modified files anywhere. The only important part to know is to keep the boards width, the location of the connector on the DOS card side, and the 4 holes unchanged. The connector on the other side should be the same to use the same bracket off the Reply DOS cards or you could change it to break out game port and VGA port rather than to rely on hard to find cable."

Future Plans

I will be modifying tomytronics' original design to fix the interference issues. I will also add a 3.5mm headphone jack. There will probably be two or 3 versions of the extender. One will have the original HD-26 connect

Bill of Materials

Quantity Product Number Datasheet
1 L717HDA26PD1CH4F pdf
1 L77HDA26SD1CH4F pdf


Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.


For more great retro hardware projects and a great community check out:

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Join us in #skunkworks on Discord to help make retro solutions available to all.

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Special Thanks

tomytronics, warmech, Ron's Computer Videos