DTC 520A - SASI or SCSI?

From: Don Maslin <donm_at_cts.com>
Date: Wed Dec 15 14:20:01 1999

On Tue, 14 Dec 1999, Ethan Dicks wrote:

> Going through a box of disk interface cards, I ran across a couple of these
> DTC 520As. Cursory examination shows a 50-pin connector (J4) with two
> termination resistors (220/330), two 20-pin connectors (J2, J3) which are
> presumably analog data for two ST506 drives and two 34-pin connectors (J1
> and J9). I would expect that J1 is the control cable that goes with J2 and
> J3. I suspect that J9 is for floppies. The major chips are two 8255s, one
> 8085, one DTC-037, one NEC D765, one FDC-043, one DTC MSA 2827G, an AMD P8353,
> and an AMD AM9517. There are several chips with the numbers covered by type-
> written numbers, PALs and ROMs, no doubt.
> There are 8 LEDs in a row by the power connector and an 8-position DIP switch.
> >From the date codes, it appears to have been made near the end of 1983.
> Can anyone shed any additional light on this device? Knowing what this was
> expecting to hook up to and how to set the DIP switches would be a great help.
> Many thanks,
> -ethan

I have a manual for the DTC500DB series, which are all SASI interface.
However, there are so many differences in switches/jumpers that I can
make no meaningful guesses at what yours should be. The DB's for
example have no DIP switches - only jumpers.

                                                 - don

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Received on Wed Dec 15 1999 - 14:20:01 GMT

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