TEAC notebook floppy drive pinout

Richard Erlacher

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Feb 12, 2001, 12:32:36 AM2/12/01

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I'd like to reuse, rather than pitch, a notebook FDD, TEAC model
FD05-030-U. This is, I believe, an OEM drive made for COMPAQ. (?)

It has only one visible IC, that being numbered
3975-50
T4A36F
followed by a date code.

If you know what the pinout of the 26-conductor cable attached to this
drive is, or if you know the connections between that IC and the usual
34-conductor cable, could you please share this information with me?

thanks,

Dick

Harold Bower

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Feb 12, 2001, 4:19:06 PM2/12/01

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Dick, I have had good luck over the years from TEAC's documentation
support for various drives. You might check their web site for the
model number. I believe that there is a near-standard for 26-pin
conections to small floppies. Many moons ago, I looked at an Epson 3.5"
laptop drive that had a 26-pin ribbon connector and it appeared to be
the same as the 26-pin connector on the 3" drive in my Amstrad PCW-9216
which I (by trial and error) deciphered and made an adapter for a normal
34-pin regular 3.5" drive B:.

Here is the pinout from TEAC on their FD-334HF-06X 3.5" HD drive with
26-pin connector (Note: no power connector, power is on the ribbon). I
made an adapter for this drive to separate power and 34-pin connector
when I built my YASBEC-based laptop.

1 - +5v 2 - INDEX
3 - +5v 4 - DS0(/HO/OP) Multiple options depend on jumper block
5 - +5v 6 - DS1(/DC/OP)
7 - NC 8 - DC(/RY/HO/DS2/OP)
9 - NC 10 - MOTOR ON
11 - OP(/HI/HO/RY) 12 - DIRECTION SELECT
13 - OP(/DC/RY) 14 - STEP
15 - 0v (Gnd) 16 - WRITE DATA
17 - 0v 18 - WRITE GATE
19 - 0v 20 - TRACK 00
21 - 0v 22 - WRITE PROTECT
23 - 0v 24 - READ DATA
25 - 0v 26 - SIDE ONE SELECT

Good Luck.
Hal

Richard Erlacher

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Feb 12, 2001, 11:46:07 PM2/12/01

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Sadly, it's pretty clear that the pinout is not identical, as one of
the no-connects is definitely connected. One of these days, I'll
figure out to which pin of the LSI it's connected, but for now, not
having the LSI's pinout corresponding to a 34-pin connector, I can't
do much.

Thanks for taking the time to list this connector data for me.

Dick

j.cammell

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Feb 16, 2001, 1:52:47 AM2/16/01

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Hi All,
Could someone explain the Cryptic letters of the pinouts 4,6,8,11 and
13
Please, I am having trouble with 3 1/2 SSDD teac FD 35E PS 06U
and I want to replace it.
The spare drive I have has those same cryptic letters.

TIA Jack

Harold Bower

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Feb 16, 2001, 4:18:48 PM2/16/01

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DS0 - Drive select for unit 0. Pulled low to activate
DS1 - Drive select for unit 1. Same
DC - Disk Change. A signal going from the drive to indicate that a
disk has been removed or inserted. This signal is not normally used on
CP/M systems, and was added (basically) around the time "High Density"
drives came out in the IBM PC era.
OP - Open.

The pins with options can be jumpered for the other functions usually
via jumper blocks. You either need the data sheet for the drive to
figure these out, or do it via the "school of hard knocks" (trial and
error).

RY - Drive ready. This signals that the disk is up-to-speed and is
ready for a read/write operation.

HO - Signal from the drive indicating that a "High-Density" disk is in
the drive
HI - Signal TO the drive telling it to use "High-Density" parameters
(500 kbps instead of 250 kbps).

That should help you.

Hal