27 Nov
2008
27 Nov
'08
8:39 p.m.
I have 3 3.5" floppy drives with configuration jumpers (and 5 times
as many without :-) ).
Ons is a Chinon FZ-357, and has jumpers for: MD, RDY, MM, DC, and
TTL/C-MOS.
Another is a TEAC FD-235HF and has jumpers for: H HO, OP, LHI, HHI,
and a position (but no header pins) for FG.
The last is a Sony MPF520-1 which has 2 rows of 3 pins... and I have
no idea what they are for.
I understand some abbreviations... RDY (ready), DC (disk change),
but not MD, MM, TTL/C-MOS (assuming this is for interface logic
levels?), and the TEAC ones I don't know at all.
The Sony one is a mystery, and a google search hasn't turned
anything up... don't know if the headers are for selecting D0-D3
only... or more than that.
Can someone fill me in/point me to web pages on these 'magic' jumpers
for these drives ?
Thanks,
-- Curt
28 Nov
28 Nov
12:57 a.m.
On 28/11/2008 04:39, Curtis H. Wilbar Jr. wrote:
Another is a TEAC FD-235HF and has jumpers for: H HO,
OP, LHI, HHI,
and a position (but no header pins) for FG.
See if Google can find you a document called 3fd0020a.pdf -- that's
TEAC's config sheeet for the whole FD235 range. There are lots of
models with different jumpers. That one is one of the dual 720K/1.44M
3xxx (old) versions.
HO determines whether it outputs a signal to tell the host controller
whether the disk is DD or HD, normally on pin 2.
HI determines whether it accepts a density select input on pin 2.
LHI and HHI are something to do with the density select input on pin 2.
They're definitely related to HI, but I seem to recall having jumpers
on all three on at least one drive. I'm pretty sure you jumper both or
neither, never just one.
I'm not sure what H on its own would be. HA tells the drive to
determine density itself, from the HD hole sensor, instead of getting it
from the host.
Sometimes there's a number after the jumper name, like for DC. DC34
means the Disk Changed signal is on pin 34, while DC2 (on a few models)
means it puts that signal on pin 2.
FG is for Frame Ground; sometimes there's a jumper or solder link to
connect it to the 0V DC supply.
The last is a Sony MPF520-1 which has 2 rows of 3
pins... and I have
no idea what they are for.
I understand some abbreviations... RDY (ready), DC (disk change),
but not MD, MM, TTL/C-MOS (assuming this is for interface logic
levels?), and the TEAC ones I don't know at all.
MD and MM usually refer to what turns the motor on: only when asserted
with Drive Select, or any time the Motor On signal is active.
The Sony one is a mystery, and a google search
hasn't turned
anything up... don't know if the headers are for selecting D0-D3
only... or more than that.
Some Sony drives have jumpers to determine when they output index pulses
(only when the drive is up top speed, or always). But if you only have
a few, they're probably just the drive select jumpers.
--
Pete Peter Turnbull
Network Manager
University of York
6:13 a.m.
Pete Turnbull wrote:
On 28/11/2008 04:39, Curtis H. Wilbar Jr. wrote:
Found that... doesn't cover this one (or not that I can see).
Mine has 6 jumpers, not a grid, and they are :
H HO
OP
LHI
HHI
D1
D0
The specifics on this TEAC are:
DF-235HF 172-U
P/NO. 19307321-72
Read on below for some more on the Sony drive...
Another is a TEAC FD-235HF and has jumpers for: H
HO, OP, LHI, HHI,
and a position (but no header pins) for FG.
See if Google can find you a document called 3fd0020a.pdf -- that's
TEAC's config sheeet for the whole FD235 range. There are lots of
models with different jumpers. That one is one of the dual 720K/1.44M
3xxx (old) versions.
HO determines whether it outputs a signal to tell the host controller
whether the disk is DD or HD, normally on pin 2.
HI determines whether it accepts a density select input on pin 2.
LHI and HHI are something to do with the density select input on pin
2. They're definitely related to HI, but I seem to recall having
jumpers on all three on at least one drive. I'm pretty sure you
jumper both or neither, never just one.
I'm not sure what H on its own would be. HA tells the drive to
determine density itself, from the HD hole sensor, instead of getting
it from the host.
Sometimes there's a number after the jumper name, like for DC. DC34
means the Disk Changed signal is on pin 34, while DC2 (on a few
models) means it puts that signal on pin 2.
FG is for Frame Ground; sometimes there's a jumper or solder link to
connect it to the 0V DC supply.
On the Sony one, the bottom side has silscreened for one jumper S0/S1
and the Other 3/3M. So one is drive0/drive1, but what is the other ?
-- Curt
The last is a Sony MPF520-1 which has 2 rows of 3
pins... and I have
no idea what they are for.
I understand some abbreviations... RDY (ready), DC (disk change),
but not MD, MM, TTL/C-MOS (assuming this is for interface logic
levels?), and the TEAC ones I don't know at all.
MD and MM usually refer to what turns the motor on: only when asserted
with Drive Select, or any time the Motor On signal is active.
The Sony one is a mystery, and a google search
hasn't turned
anything up... don't know if the headers are for selecting D0-D3
only... or more than that.
Some Sony drives have jumpers to determine when they output index
pulses (only when the drive is up top speed, or always). But if you
only have a few, they're probably just the drive select jumpers.
7:24 a.m.
On 28/11/2008 14:13, Curtis H. Wilbar Jr. wrote:
Mine has 6 jumpers, not a grid, and they are :
H HO
OP
LHI
HHI
D1
D0
Aha -- that first one is HHO. It controls whether the drive outputs a
density signal according to what its hole sensor detects. LHI and HHI
are are pair that you set according to whether you want to input an
active-high or active-low density select from the controller (usually
you don't). OP is normally shorted on a PC, but I can't remember what
exactly it does (something to do with disk changed, IIRC).
On the Sony one, the bottom side has silscreened for
one jumper S0/S1
and the Other 3/3M. So one is drive0/drive1, but what is the other ?
S0/S1 is the drive select (DS) or DS1). I expect the other jumper set
may be to do with the density, and whether it determines that from the
holes in the disk ("Auto") or by a signal from the controller ("AT").
--
Pete Peter Turnbull
Network Manager
University of York
1:06 p.m.
On 28/11/2008 04:39, Curtis H. Wilbar Jr. wrote:
One annoying thing about Teac is that they don't put a description of the
jumpers in the service manual (I have several such manuals for drives
that I own). Why not, I don't know.
Another is a TEAC FD-235HF and has jumpers for: H
HO, OP, LHI, HHI,
and a position (but no header pins) for FG.
See if Google can find you a document called 3fd0020a.pdf -- that's
TEAC's config sheeet for the whole FD235 range. There are lots of The last is a
Sony MPF520-1 which has 2 rows of 3 pins... and I have
no idea what they are for.
I understand some abbreviations... RDY (ready), DC (disk change),
but not MD, MM, TTL/C-MOS (assuming this is for interface logic
levels?), and the TEAC ones I don't know at all.
MD and MM usually refer to what turns the motor on: only when asserted
with Drive Select, or any time the Motor On signal is active.
The Sony one is a mystery, and a google search
hasn't turned
anything up... don't know if the headers are for selecting D0-D3
only... or more than that.
Some Sony drives have jumpers to determine when they output index pulses
(only when the drive is up top speed, or always). But if you only have
a few, they're probably just the drive select jumpers.
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