3 Aug
2007
3 Aug
'07
9:21 a.m.
I'm just trying to figure out the jumper settings
on a ST-412 drive. I've read the manual and it sort
of helps, but its somewhat obtuse in style.
I have two drives which are taken from working
PDP 11/23's - they both have the same setting on
the jumper block.
The jumper block is a 16 pin DIL socket, with a
14 pin DIL plug inserted. The plug has 7 metal
bars, 3 of which are open circuit, the rest
are closed.
Working from the connector end of the PCB, the
first bar - open
second bar - open
third bar - closed
fourth bar - open
fifth bar - closed
sixth bar - closed
seventh bar - closed
Looking in the manual the first bar would persumably
be written as 8-9, the second as 7-10 etc?
Anyway, I'm trying to use this in a PERQ just to
test the EIO is working, and I can boot of floppy.
So I need to set this as drive 1. What bars would I
need to open and close?
Thanks
Ian.
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3 Aug
3 Aug
9:32 a.m.
Ian,
Try here...
http://www.4drives.com/DRIVESPECS/
Ta,
Andy P.
On 03/08/07, silvercreekvalley <silvercreekvalley at yahoo.com> wrote:
I'm just trying to figure out the jumper settings
on a ST-412 drive. I've read the manual and it sort
of helps, but its somewhat obtuse in style.
I have two drives which are taken from working
PDP 11/23's - they both have the same setting on
the jumper block.
The jumper block is a 16 pin DIL socket, with a
14 pin DIL plug inserted. The plug has 7 metal
bars, 3 of which are open circuit, the rest
are closed.
Working from the connector end of the PCB, the
first bar - open
second bar - open
third bar - closed
fourth bar - open
fifth bar - closed
sixth bar - closed
seventh bar - closed
Looking in the manual the first bar would persumably
be written as 8-9, the second as 7-10 etc?
Anyway, I'm trying to use this in a PERQ just to
test the EIO is working, and I can boot of floppy.
So I need to set this as drive 1. What bars would I
need to open and close?
Thanks
Ian.
____________________________________________________________________________________
Yahoo! oneSearch: Finally, mobile search
that gives answers, not web links.
http://mobile.yahoo.com/mobileweb/onesearch?refer=1ONXIC
10:27 a.m.
On Friday 03 August 2007 12:21, silvercreekvalley wrote:
The jumper block is a 16 pin DIL socket, with a
14 pin DIL plug inserted. The plug has 7 metal
bars, 3 of which are open circuit, the rest
are closed.
Those things are one-time use, and annoying. I've successfully replaced them
with a DIPswitch, which allows you much more in the way of flexibility to
try different settings. :-)
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
12:37 p.m.
On 3 Aug 2007 at 13:27, Roy J. Tellason wrote:
Those things are one-time use, and annoying.
I've successfully replaced them
with a DIPswitch, which allows you much more in the way of flexibility to
try different settings. :-)
Same here--and highly recommended. In one case, the DIP switch
resulted in too high a profile, so I substituted a DIP header with
soldered jumpers. At least one could reuse it. Another technique
I've seen is simply to use little U-shaped jumpers of #20 sold wire
jammed into the socket. Not pretty, but it works.
Cheers,
Chuck
3:29 p.m.
On Friday 03 August 2007 12:21, silvercreekvalley wrote:
You mean you'd not soldered bits of wire-wrap wire across open bars to
close them again? I don;'t recomend it, but I did do it once in an
emergency...
I agre e thye're annoying -- very. I normally replace them either with a
DIP switch, as you do, (there are osme now which are no larger than an IC,
much lower profile than the older ones) oe with a header plug that I
solder jumpers across.
-tony
The jumper block is a 16 pin DIL socket, with a
14 pin DIL plug inserted. The plug has 7 metal
bars, 3 of which are open circuit, the rest
are closed.
Those things are one-time use, and annoying. I've successfully replaced=
3:26 p.m.
I'm just trying to figure out the jumper settings
on a ST-412 drive. I've read the manual and it sort
of helps, but its somewhat obtuse in style.
I've read the OEM manual on Bitsacers, I've also dug out the schemaitcs
in the IBM Techref. There are some differences (!), but the ones you want
to change all agree.
I have two drives which are taken from working
PDP 11/23's - they both have the same setting on
the jumper block.
The jumper block is a 16 pin DIL socket, with a
14 pin DIL plug inserted. The plug has 7 metal
bars, 3 of which are open circuit, the rest
are closed.
Working from the connector end of the PCB, the
first bar - open
second bar - open
third bar - closed
fourth bar - open
fifth bar - closed
sixth bar - closed
seventh bar - closed
Looking in the manual the first bar would persumably
be written as 8-9, the second as 7-10 etc?
YEs. Number the pins like a 16 pin DIL IC (whcih is, after all, what it is).
first bar - open 8-9
second bar - open 7-10
third bar - closed 6-11
fourth bar - open 5-12
fifth bar - closed 4-13
sixth bar - closed 3-14
seventh bar - closed 2-15
eight line -- Nonexistant 1-16
OK, now for the defintions :
1-16 : 'Multiplezed'. Shorting this enables the drive at all times, for
controllers with a separate control cable to each drive. The PERQ is not
like this, this must be OPEN
2-15, 3-14, 4-13 : The defition of these seems to depend on the PCB
version (at least if the schematics can be beleived). They may enable
diagnostic modes, etc, when open. For normal operation, leave them alone,
which both from your exisitng jumper block and from the schemaitcs, would
be all closed
5-12 : DS4
6-11 : DS3
7-10 : DS2
8-9 : DS1
Those 4 jumpers control the drive select (DS). Normally one is closed, all
the rest are open. In yuor case, 6-11 is closed, meaning the drivce is set
to DS3 (normal for a PDP11?) You want ot cut that jumper and bridge 8-9
What I'd do is get one of the new-type tiny DIP switches that's the same
size as an IC package (not the old 'boxy' type), and fit that in place of
the jumper block. Yop can then flip the switches to set the DS line, etc)
-tony
6151
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6151
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5 comments
5 participants
participants (5)
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andy.piercy＠gmail.com -
ard＠p850ug1.demon.co.uk -
cclist＠sydex.com -
rtellason＠verizon.net -
silvercreekvalley＠yahoo.com