11 May
2007
11 May
'07
2:34 p.m.
All:
I have a few IBM-labeled YE-Data YE-580 (320k/360k) half-height floppy
drives. I can?t seem to locate a manual for these on-line so I wondered if
they use the standard 150 ohm terminator or something else (the Teac uses
330 ohm for example).
Any info appreciated. Thanks.
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.altair32.com
http://highgate.comm.sfu.ca/~rcini/classiccmp
11 May
11 May
3:21 p.m.
On 11 May 2007 at 17:34, Richard A. Cini wrote:
I have a few IBM-labeled YE-Data YE-580
(320k/360k) half-height floppy
drives. I can?t seem to locate a manual for these on-line so I wondered if
they use the standard 150 ohm terminator or something else (the Teac uses
330 ohm for example).
I don't know if these are the same as those described in the IBM O&A
as the "Slimline Diskette Drive", but if they are, the terminators
shown are 150 ohm. If U1 on the drive PCB is a 74LS123, these are
them.
I have a few YD-380 720K drives, but the terminators are on 7-
position DIP switches and appear to be abou 3.3K.
Cheers,
Chcuk
4:44 p.m.
On 11 May 2007 at 17:34, Richard A. Cini wrote:
> I have a few IBM-labeled YE-Data YE-580 (320k/360k) half-height floppy
> drives. I can?t seem to locate a manual for these on-line so I wondered if
> they use the standard 150 ohm terminator or something else (the Teac uses
> 330 ohm for example).
On Fri, 11 May 2007, Chuck Guzis wrote:
I don't know if these are the same as those
described in the IBM O&A
as the "Slimline Diskette Drive",
The first half-height drives in IBM machines were the Qumetrak 142. They
were so slow that PC-DOS 2.10 had to set a slower access time than 2.00
They were slightly more reliable than the BASF 2/3 height -
less than 100% DOA.
--
Grumpy Ol' Fred cisin at xenosoft.com
7:42 p.m.
Interestingly, the IC1 on this drive is a QFP chip from Hitachi (HA16642MP).
The PC board revision is "Rev. C" so maybe that's part of it. I think this
is probably an AT-era drive but I thought the base AT came with 1.2mb
drives? Maybe an option?
On 5/11/07 6:21 PM, "Chuck Guzis" <cclist at sydex.com> wrote:
On 11 May 2007 at 17:34, Richard A. Cini wrote:
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.altair32.com
http://highgate.comm.sfu.ca/~rcini/classiccmp
I have a few IBM-labeled YE-Data YE-580
(320k/360k) half-height floppy
drives. I can?t seem to locate a manual for these on-line so I wondered if
they use the standard 150 ohm terminator or something else (the Teac uses
330 ohm for example).
I don't know if these are the same as those described in the IBM O&A
as the "Slimline Diskette Drive", but if they are, the terminators
shown are 150 ohm. If U1 on the drive PCB is a 74LS123, these are
them.
I have a few YD-380 720K drives, but the terminators are on 7-
position DIP switches and appear to be abou 3.3K.
Cheers,
Chcuk
10:01 p.m.
On 11 May 2007 at 22:42, Richard A. Cini wrote:
Interestingly, the IC1 on this drive is a QFP chip
from Hitachi (HA16642MP).
The PC board revision is "Rev. C" so maybe that's part of it. I think this
is probably an AT-era drive but I thought the base AT came with 1.2mb
drives? Maybe an option?
Nope--that'd be the 380. Here's the info and a few specs for the
580:
http://ja1wby.art.coocan.jp/hamg/7-fm7-fdd/2-yd-580.html
Note that the spec calls for 150 ohm pullups on both the host and
drive side.
Cheers,
Chuck
12 May
12 May
4:48 a.m.
Chuck:
The manufacturers label on the drive says "YD-580 320k/360k". I just
tried the drive on my Hawthorne SBC and terminated it with 150 ohms and it
works fine.
The only thing I noticed is that the drive light stays on after being
accessed. There are two jumper positions called HM and HS. HS is open and HM
is connected. Any idea as to how make to light follow the select line?
Rich
On 5/12/07 1:01 AM, "Chuck Guzis" <cclist at sydex.com> wrote:
On 11 May 2007 at 22:42, Richard A. Cini wrote:
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.altair32.com
http://highgate.comm.sfu.ca/~rcini/classiccmp
Interestingly, the IC1 on this drive is a QFP
chip from Hitachi (HA16642MP).
The PC board revision is "Rev. C" so maybe that's part of it. I think this
is probably an AT-era drive but I thought the base AT came with 1.2mb
drives? Maybe an option?
Nope--that'd be the 380. Here's the info and a few specs for the
580:
http://ja1wby.art.coocan.jp/hamg/7-fm7-fdd/2-yd-580.html
Note that the spec calls for 150 ohm pullups on both the host and
drive side.
Cheers,
Chuck
9 a.m.
On 12 May 2007 at 7:48, Richard A. Cini wrote:
The only thing I noticed is that the drive light
stays on after being
accessed. There are two jumper positions called HM and HS. HS is open and HM
is connected. Any idea as to how make to light follow the select line?
I'd have to goof around with one of my own drives, but at a guess,
does the LED currently follow the "motor on" signal? If so, try
changing both jumpers. If that doesn't do anything, I'll dig a
drive out and see if I can make heads or tails of it. There are
*lots* of jumpers on the 380--and a head-load solenoid to boot.
Cheers,
Chuck
10 a.m.
On 12/05/2007 12:48, Richard A. Cini wrote:
The only thing I noticed is that the drive light
stays on after being
accessed. There are two jumper positions called HM and HS. HS is open and HM
is connected. Any idea as to how make to light follow the select line?
Those are the standard labels for "Head Load with Motor On" and "Head
Load with Drive Select". Removing the jumper from HM and putting it on
HS might do what you want.
--
Pete Peter Turnbull
Network Manager
University of York
2:06 p.m.
Interestingly, the IC1 on this drive is a QFP chip from Hitachi (HA16642M=
P).
The PC board revision is "Rev. C" so maybe that's part of it. I think thi=
s
is probably an AT-era drive but I thought the base AT came with 1.2mb
drives? Maybe an option?
Does it have a '*' moulded into the front panel? There was a 360K floppy
drive option for the PC/AT, and it was distiguished from the 1.2M byte
versiobn by having said '*'. A crazy idea, since older 360K drives were
not so marked, so it would have been clearer if the new type of drive --
the 1.2M one -- had had the marking.
Anyway, if so, I should have some info on it in the PC/AT
options/adapters docs.
-tony
6:37 p.m.
Tony:
It does have a molded star in the faceplate so I guess that's what it
must be.
Rich
On 5/12/07 5:06 PM, "Tony Duell" <ard at p850ug1.demon.co.uk> wrote:
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.altair32.com
http://highgate.comm.sfu.ca/~rcini/classiccmp
Interestingly, the IC1 on this drive is a QFP chip from Hitachi (HA16642M=
P).
The PC board revision is "Rev. C" so maybe that's part of it. I think thi=
s
is probably an AT-era drive but I thought the base AT came with 1.2mb
drives? Maybe an option?
Does it have a '*' moulded into the front panel? There was a 360K floppy
drive option for the PC/AT, and it was distiguished from the 1.2M byte
versiobn by having said '*'. A crazy idea, since older 360K drives were
not so marked, so it would have been clearer if the new type of drive --
the 1.2M one -- had had the marking.
Anyway, if so, I should have some info on it in the PC/AT
options/adapters docs.
-tony
7:10 p.m.
On 12 May 2007 at 21:37, Richard A. Cini wrote:
It does have a molded star in the faceplate so I
guess that's what it
must be.
If the drive has MB4392 and MB14301 (18 pin) ICs on it, then it's the
"Double Sided Diskette Drive" in the AT O&A. I blew right past it
the first time because my AT tech ref has the first revision, which
calls it a 96 tpi/360 rpm drive. The second revision, in my O&A
correctly labeles it as a 320/360K drive.
If you need the circuit diagram, I can scan it for you. But 150 ohms
is still the correct PU value.
Cheers,
Chuck
8:04 p.m.
If you had the time, yes, I'd like a scan and any page about the jumper
settings. I bought some 150 ohm terminators and as expected, they work fine.
Thanks again for the help.
On 5/12/07 10:10 PM, "Chuck Guzis" <cclist at sydex.com> wrote:
On 12 May 2007 at 21:37, Richard A. Cini wrote:
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.altair32.com
http://highgate.comm.sfu.ca/~rcini/classiccmp
It does have a molded star in the faceplate
so I guess that's what it
must be.
If the drive has MB4392 and MB14301 (18 pin) ICs on it, then it's the
"Double Sided Diskette Drive" in the AT O&A. I blew right past it
the first time because my AT tech ref has the first revision, which
calls it a 96 tpi/360 rpm drive. The second revision, in my O&A
correctly labeles it as a 320/360K drive.
If you need the circuit diagram, I can scan it for you. But 150 ohms
is still the correct PU value.
Cheers,
Chuck
13 May
13 May
6:51 p.m.
Ok, I looked at the drive schematic and the schematic for the controller on
the Hawthorne board I have. The right jumper, FWIW, is the HS jumper. The
motor signal is active regardless of the drive being selected.
Unfortunately, the light stays on until the next drive is selected. I'm
thinking it has to do with the uniqueness of the Hawthorne controller. It
uses a few spare I/O bits on the 68681 communications controller to serve as
the drive select signals. The floppy IC itself is a WD1770. I'm thinking
that the code that manages these select signals is "sticky", meaning that it
never shows a "deselect", so the last drive used is still selected after the
operation completes.
On 5/12/07 10:10 PM, "Chuck Guzis" <cclist at sydex.com> wrote:
On 12 May 2007 at 21:37, Richard A. Cini wrote:
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.altair32.com
http://highgate.comm.sfu.ca/~rcini/classiccmp
It does have a molded star in the faceplate
so I guess that's what it
must be.
If the drive has MB4392 and MB14301 (18 pin) ICs on it, then it's the
"Double Sided Diskette Drive" in the AT O&A. I blew right past it
the first time because my AT tech ref has the first revision, which
calls it a 96 tpi/360 rpm drive. The second revision, in my O&A
correctly labeles it as a 320/360K drive.
If you need the circuit diagram, I can scan it for you. But 150 ohms
is still the correct PU value.
Cheers,
Chuck
11 May
11 May
4:08 p.m.
All:
I have a few IBM-labeled YE-Data YE-580 (320k/360k) half-height floppy
drives. I can=B9t seem to locate a manual for these on-line so I wondered if
they use the standard 150 ohm terminator or something else (the Teac uses
330 ohm for example).
Any info appreciated. Thanks.
Err, shouldn't the value of the termination resistor be determined by the
characteristic impedance of the cable, not by any property of the drive's
electronics? In other words, a standard ribbon cable should always have a
150Ohm, or thereabouts, terminator.
-tony
6436
days inactive
6439
days old
13 comments
5 participants
participants (5)
-
ard＠p850ug1.demon.co.uk -
cclist＠sydex.com -
cisin＠xenosoft.com -
pete＠dunnington.plus.com -
rcini＠optonline.net