Re: Priam DataTower Pictures

 From what I can find for documentation that might match the controller board in the DataTower, tape drive support is limited to copying directly to/from the DataTower hard disk (ie. not streaming to/from the Lisa or any other computer).

The interface card modifications appear to be for adjustments to the timing of the parity latch and the high byte/low byte strobes. The cable to the DataTower is a single byte wide, but the card automatically transfers two bytes (so the Lisa can do word accesses to the interface card and achieve higher throughput).

The Computer History Museum has two Priam interface cards listed. All three cards appear to differ:

http://www.computerhistory.org/collections/catalog/102673923
http://www.computerhistory.org/collections/catalog/102673924
http://c4.staticflickr.com/4/3876/18224989113_2a678d2f11_z.jpg

It appears the two CHM cards are a later version as they have Apple labelling conventions.

Presumably the blue one is the closest to a "final" version as it is has the fewest parts, 2 layers instead of 4, and has edge connector fingers that match the production Lisa connectors (the other two boards have extra fingers).

>I'm also not clear on how the tape drive was meant to work with
>LOS---or was it meant to be recognized by the OS at all?

>Nice that the interface card has so many post-hoc modifications. Can
>you tell what they were for?

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