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From: whit@milton.u.washington.edu (John Whitmore)
Newsgroups: comp.periphs.scsi
Subject: Re: SCSI to ST506?????
Summary: DTC 510 SASI disk controller
Message-ID: <9515@milton.u.washington.edu>
Date: 18 Oct 90 22:12:23 GMT
References: <NZZ%D_$@rpi.edu>
Organization: University of Washington, Seattle
Lines: 54

In article <NZZ%D_$@rpi.edu> woody@iear.arts.rpi.edu (Christopher Widmann) writes:
>
>
>  I just found among my piles of PC boards a board about the width and
>length dimensions of a 5.25" drive. It is labled as a DTC 510X. It has a
>set of scsi id jumpers, a resistor pack and the 50 pin input and the
>standard 34pin/2x20pin outs for some sort of ST506 interface.

	I'm not sure about the 'X' suffix, but I have some DTC 510B's, and
they're not SCSI, they're SASI; you might be locking up your system because
the ATN\ line (pin 32) on a SASI controller is ALWAYS grounded (hard-wired).
Check with an ohmmeter.
	Except for the ATN\ wire, the interface is similar to SCSI, and
if you're willing to write your own driver, it can be used with a SCSI
system.  You WILL have to disconnect the wire in the harness leading to
that pesky pin 32.
	The controller is intended for one or two hard disk drives using
the ST506/ST412 interface, MFM.

	
Jumpers (DTC 510B)positions designated by letter/number grid marked on board:  

4C to 5C labeled 'parity' enables parity on input
                  (parity always enabled on output)
7F to 7E jumpers labeled SECT512 and SECT1024

      SECT512    SECT1024          sector size

        out        out             256
        in         out             512
        out        in             1024
        in         in             1024

7E to 8E jumpers for controller ID; connect any one to specify ID

Factory settings: Parity IN, sector size 512

Terminator resistor packs located 3F and RP1

Connectors: 
	J6: SASI
 	J1: hard disk control interface (34 pin)
	J2, J3: hard disk data interface (20 pin)
	J10: DC power; pin 1 NC, pin 2 GND, pin 3 GND, pin 4 5Vdc, 2.6A


If you should require full information, I think DTC is still in business

	Data Technology Corporation
	2775 Northwestern Parkway
	Santa Clara, CA 95051
	(408) 496-0434


		John Whitmore