On Mon 21 May 2018 at 11:06:04 +0200, afachat@gmx.de wrote: > It is from COMPUTHINK (it says so on the back), some other texts on the board > read: "FAB 5000120-000" and "DD DSK CTL P2", "ASSY 1000176". > Hand written there is the number "401614" (serial#?) The Compu/Think disk drives were quite popular in the Netherlands. The PBE (PET Benelux Exchange) had quite some software for it in its collection (which unfortunately seems to be mostly lost, except for some disks in Ruud's collection). But at our school computer club we never had one, I just know about them from reading the early PBE magazines. > It has a 1791 disk controller chip on it ("FD1791-B01"), one TTL IC is > unfortunately missing, but everything is socketed. > Three power regulators, +5V, +12V, -5V. It seems to plug into the two > expansion connectors on the PET although I think the layout is wrong, as both > (single-line!) are aligned with each other, not displaced/shifted as in the > later dynamic/universal PETs. They were there before Commodore had its own disk drives, I think, so they would be for the earlier models. The easiest way to distinguish the earlier generations is by their expansion connector. The first version uses a card edge, the second one (3032 generation) uses headers in a row, and the next one (4032/8032 generation) uses headers but displaced/shifted as you mention. -Olaf. -- ___ Olaf 'Rhialto' Seibert -- Wayland: Those who don't understand X \X/ rhialto/at/falu.nl -- are condemned to reinvent it. Poorly.
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