epson hx-20

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Sun Jan 11 12:07:09 2004

>
> On Sat, 10 Jan 2004 21:55:16 +0000 (GMT)
> ard_at_p850ug1.demon.co.uk (Tony Duell) wrote:
>
> > IIRC, those are the 1/3rd height Epson drives with linear actuator
> > positioners (a bit like a mini-RK05 positioner!).
> Yes, 1/3rd height, with a push button on the front (not the more
> common lever lock).
>
> > They were also used in the QX10, and the techincal manual for that
> > machine (which I have) contains schematics, etc.
> I believe that the TF20 was usable with the QX10 using the extra
> parallel interface on the back. If you have the schematics for the drive
> that sounds like it would be useful.
>
> > However, 320K DSDD sounds like a 40 cylinder format to me. Are you
> > sure a PC 360K drive can't read them?
> Not sure, as the only 5.25" drives I have access to are the two epson
> ones in the TF20. Hence the interest in hooking them up to a PC ;) The
> drives are definitely 40 cylinder.

OK, I've dug out the manual. There is one 4-position DIP switch on the
main board (3204700), marked SS1. This sets the drive selects. One side
of each switch is commoned (and then goes to one end of R8, pin 29 of the
SDF-9401 chip IC4 and pin 15 of the SLA4030COB chip IC5). The other side
of each switch goes to one of the drive select lines on the connector.

There also seem to be 2 links marked SS2 and SS3. SS3 just selects what
the front LED does (drive selected or head load I think). SS2 seems to
have something to do with enabling the head psoitioner, I'd leave it
alone for the moment.

The connector pinouts are standard. On the interface connector, all odd
numbers are gorund. The signals are :

6 : Drive Sleect 3
8 : Index
10 : Drive Select 0
12 : Drive Select 1
14 : Drive Select 2
16 : Motor On
18 : Step Direction
20 : Step Pulse
22 : Write Data
24 : Write Gate
26 : Track 0
28 : Write Protext
30 : Read Data
32 : Side Select
34 : Ready.

-tony
Received on Sun Jan 11 2004 - 12:07:09 GMT