Re: Priam DataTower Pictures

Very impressive. So how does the user see the drives from the LisaOS?

btw - where in the world did you find the Priam....I can't imagine they sold very many of them.

On Thu, Jun 18, 2015 at 12:32 PM, James MacPhail <gg__at_email.domain.hidden> wrote:

>
> 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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