Re: Priam DataTower Pictures

I'd love to hear a recording of the sounds this thing makes in operation!

-J

On Thu, Jun 18, 2015 at 1:32 PM, chandra bajpai <cbajpai_at_email.domain.hidden> wrote:

> 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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-- 
Jason Perkins
313 355 0085

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