28 May
2005
28 May
'05
5:08 p.m.
Hi folks,
I'm after a 5.25" 80-track (preferably 40/80 switchable) DSDD drive,
jumperable for DS0 and 300RPM rotation, suitable for an Acorn Master 128.
I'm also after a decent-quality scan of the keystrip that came with the
Master 128. A copy of the Master 128 schematic and/or service manuals would
also be rather nice :)
Thanks.
--
Phil. | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB,
philpem at philpem.me.uk | ViewFinder, 10BaseT Ethernet, 2-slice,
http://www.philpem.me.uk/ | 48xCD, ARCINv6c IDE, SCSI
... How much sin can I get away with and still go to heaven?
28 May
28 May
11:58 p.m.
New subject: WTD: 5.25' DSDD drive & Acorn Master128 keystrip scan/schematic
I'm after a 5.25" 80-track (preferably
40/80 switchable) DSDD drive,
Never heard of that, and I can't seen any way it could possibly work.
5.25" drives either have a wide head gap for 48 TPI (35-track or
40-track), or a narrow head gap for 96 TPI (80-track) or 100 TPI
(77 track). You can't "switch" without replacing the heads.
What you can do is read 35-track or 40-track diskettes in a 96 TPI
drive. The drive doesn't need anything special for that. However,
writing to them will not work reliably.
If you need to be able to write 40-track and 80-track diskettes, you
need two drives.
Eric
29 May
29 May
1:40 a.m.
New subject: WTD: 5.25' DSDD drive & Acorn Master128 keystrip scan/schematic
In message <53116.71.129.198.222.1117349883.squirrel at 71.129.198.222>
"Eric Smith" <eric at brouhaha.com> wrote:
Never heard of that, and I can't seen any way it
could possibly work.
The drives have a double-stepping circuit onboard. Every individual head step
becomes a double-step. The idea being that you can read 40t discs in an 80t
drive.
If you need to be able to write 40-track and 80-track
diskettes, you
need two drives.
Looks like I'm looking for a 40-track (48TPI) and an 80-track (96TPI) then.
90% of the time, I only need to read 40t discs, but the ability to write to
them would be quite useful.
I spotted a Shugart SA455 on Ebay though - are they any good?
<http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=5201792809>.
(I've checked the service manual on bitsavers, yes I know it's 40 track, so
that leaves an 80 track still to find).
I've got a Viglen dual-disc 5.25" drive here, but I really don't want to rip
it apart for two reasons:
A) it's a nice drive
B) it's a pain to get it open without breaking stuff (I've already replaced
one of the 40/80 switches and resoldered the other - I spent an hour
with a metal spatula trying to pop the clips on the case without
breaking them or damaging the case)
Later.
--
Phil. | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB,
philpem at philpem.me.uk | ViewFinder, 10BaseT Ethernet, 2-slice,
http://www.philpem.me.uk/ | 48xCD, ARCINv6c IDE, SCSI
... Who the hell is General Failure? And why is he reading my drive!
8:37 a.m.
New subject: WTD: 5.25' DSDD drive & Acorn Master128 keystrip scan/schematic
I spotted a Shugart SA455 on Ebay though - are they any good?
<http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=5201792809>.
A google search on the "-3AA" version (the type in the auction), reports
it
as a 1.2MB (DSHD) version.
Jim.
3:01 p.m.
New subject: WTD: 5.25' DSDD drive & Acorn Master128 keystrip scan/schematic
> I spotted a Shugart SA455 on Ebay though - are
they any good?
> <http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=5201792809>.
On Sun, 29 May 2005, Jim Beacon wrote:
A google search on the "-3AA" version (the
type in the auction), reports it
as a 1.2MB (DSHD) version.
Regardless of the REVISION level,
a SA455 is a "360K" DS 48tpi drive;
a 465 is a "720K" DS 5.25" 96TPI drive;
a 475 is a "1.2M" drive.
3:19 p.m.
New subject: WTD: 5.25' DSDD drive & Acorn Master128 keystrip scan/schematic
From: "Fred Cisin" <cisin at xenosoft.com>
Sent: Sunday, May 29, 2005 5:01 PM
Please note many 1.2MB can be jumpered to be "720K" drives and they are very
common.
Randy
www.s100-manuals.com
> I spotted
a Shugart SA455 on Ebay though - are they any good?
> <http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=5201792809>.
On Sun, 29 May 2005, Jim Beacon wrote:
A google search on the "-3AA" version
(the type in the auction), reports
it
as a 1.2MB (DSHD) version.
Regardless of the REVISION level,
a SA455 is a "360K" DS 48tpi drive;
a 465 is a "720K" DS 5.25" 96TPI drive;
a 475 is a "1.2M" drive.
3:32 p.m.
New subject: WTD: 5.25' DSDD drive & Acorn Master128 keystrip scan/schematic
> I spotted a Shugart SA455 on Ebay though - are
they any good?
> <http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=5201792809>.
On Sun, 29 May 2005, Jim Beacon wrote:
> A google search on the "-3AA" version (the type in the auction), reports
> it as a 1.2MB (DSHD) version. Please note many 1.2MB can be jumpered to be
"720K" drives and they are very
common.
quite true, the differences between 720K and 1.2M do not include track
width.
But NO kinda jumpering will turn a SA455-3AA into a "720K" OR "1.2"
--
Grumpy Ol' Fred cisin at xenosoft.com
10:14 a.m.
New subject: WTD: 5.25' DSDD drive & Acorn Master128 keystrip scan/schematic
I'm after a 5.25" 80-track (preferably
40/80 switchable) DSDD drive,
Never heard of that, and I can't seen any way it could possibly work.
5.25" drives either have a wide head gap for 48 TPI (35-track or
40-track), or a narrow head gap for 96 TPI (80-track) or 100 TPI
(77 track). You can't "switch" without replacing the heads.
7146
days inactive
7146
days old
7 comments
6 participants
participants (6)
-
ard＠p850ug1.demon.co.uk -
cctalk＠randy482.com -
cisin＠xenosoft.com -
eric＠brouhaha.com -
jim＠g1jbg.co.uk -
philpem＠dsl.pipex.com