9 Jan
2004
9 Jan
'04
3:16 p.m.
i hope you can help me. i found you with www.google.de. i?m looking for a schematic of an
epson hx-20 and other technical information. i have tree of them, but only one work
corektly. the other two don?t start the basic interpreter an work only with the monitor.
do you have a tip for me, where i can become information or schematics for tghe hx-20?
by
denis
10 Jan
10 Jan
8:54 a.m.
On Fri, 9 Jan 2004 22:16:13 +0100
"Denis Juroszek" <denis(a)juroszek.de> wrote:
i hope you can help me. i found you with
www.google.de. i?m looking for a schematic of an epson hx-20 and other technical
information.
I have the complete manuals (Programming, Technical, user etc) for the
HX20. If you let me know what you need, I can let you have the information you need.
i have tree of them, but only one work corektly. the
other two don?t > start the basic interpreter an work only with the monitor. do you
have > a tip for me, where i can become information or schematics for tghe > hx-20?
Have you tried doing the CTRL-@ reset trick? HX20s have a habit of getting corrupt
memory ;) The battery might be getting a little old, too (and don't run off AC power
without a good battery, as it acts to limit the raw DC input voltages seen by the
machine)
On a related note, I was wondering if anyone had any ideas about how to transfer HX20
disks to PC. The TF-20 wrote 320K 5.25" DSDD disks. I have two 5.25" (Epson
brand) floppy drives in a TF20, but I'm not quite sure about how to hook them to a PC
floppy interface (or if it is even possible). Each drive has 4 dip switches (presumably
for A/B settings etc), but no settings documentation. The other way is to use the TF20 via
the serial port, and pretend to be an HX20.
2:40 p.m.
On Sat, 10 Jan 2004 jmw(a)ptolserv.com wrote:
On a related note, I was wondering if anyone had any
ideas about how to
transfer HX20 disks to PC. The TF-20 wrote 320K 5.25" DSDD disks. I have
two 5.25" (Epson brand) floppy drives in a TF20, but I'm not quite sure
about how to hook them to a PC floppy interface (or if it is even
possible). Each drive has 4 dip switches (presumably for A/B settings
etc), but no settings documentation. The other way is to use the TF20
via the serial port, and pretend to be an HX20.
http://www.xenosoft.com/fmts.html
How many disks do you need to transfer?
5:24 p.m.
On Sat, 10 Jan 2004 12:40:55 -0800 (PST)
Fred Cisin <cisin(a)xenosoft.com> wrote:
Thanks, looks
interesting.
How many disks do you need to transfer?
I have about a hundred disks, although some
will be duplicates (backups etc). The majority contain source code for things like my HX20
assembler and debugger, which would be nice to make available for others.
3:55 p.m.
On a related note, I was wondering if anyone had any
ideas about how to =
transfer HX20 disks to PC. The TF-20 wrote 320K 5.25" DSDD disks. I have =
two 5.25" (Epson brand) floppy drives in a TF20, but I'm not quite sure a=
bout how to hook them to a PC floppy interface (or if it is even possible=
). Each drive has 4 dip switches (presumably for A/B settings etc), but n=
IIRC, those are the 1/3rd height Epson drives with linear actuator
positioners (a bit like a mini-RK05 positioner!). They were also used in
the QX10, and the techincal manual for that machine (which I have)
contains schematics, etc.
However, 320K DSDD sounds like a 40 cylinder format to me. Are you sure a
PC 360K drive can't read them?
-tony
4:35 p.m.
> On a related note, I was wondering if anyone had
any ideas about how to =
> transfer HX20 disks to PC. The TF-20 wrote 320K 5.25" DSDD disks. I have =
On Sat, 10 Jan 2004, Tony Duell wrote:
However, 320K DSDD sounds like a 40 cylinder format to
me. Are you sure a
PC 360K drive can't read them?
That is right
The Epson HX20 disks that I have seen (there IS more than one format!) are
readable with a 360K drive, WITH appropriate software. (It is, of course,
NOT an MS-DOS disk format)
5:31 p.m.
On Sat, 10 Jan 2004 21:55:16 +0000 (GMT)
ard(a)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.
11 Jan
11 Jan
12:07 p.m.
On Sat, 10 Jan 2004 21:55:16 +0000 (GMT)
ard(a)p850ug1.demon.co.uk (Tony Duell) wrote:
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
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.
10 Jan
10 Jan
3:39 p.m.
i hope you can help me. i found you with www.google.de. i=B4m looking =
You have posted to a large mailing list, not to a single person!
for a schematic of an epson hx-20 and other technical
information. i =
I have the hardware technical manual for the HX20, which includes
schematics, troubleshooting info, and theory-of-operation sections. Alas
I have no scanner, but I can e-mail you some hints, I think.
have tree of them, but only one work corektly. the
other two don=B4t =
start the basic interpreter an work only with the monitor. do you have a =
Have you tried a 'cold reset' (IIRC hold down ctrl-@ -- there are
instruction at the start of the menu). Some of my HX20s had problems with
BASIC which turned out to be due to garbage in memeory that was confusing
things.
tip for me, where i can become information or
schematics for tghe hx-20?
-tony
7661
days inactive
7663
days old
8 comments
4 participants
participants (4)
-
ard＠p850ug1.demon.co.uk -
cisin＠xenosoft.com -
denis＠juroszek.de -
jmw＠ptolserv.com