29 Mar
1998
29 Mar
'98
8:39 a.m.
On Sun, 29 Mar 1998, Doug Spence wrote:
<snip>
OK. That makes sense. The blue thing was the only difference I could see
between drives from my restricted viewing window.
True, as the DIP shunt is probably about 1.5" into the metal box.
<snip>
No, they are US standard. The wrench is 7/64", I believe.
- don
donm(a)cts.com
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Don Maslin - Keeper of the Dina-SIG CP/M System Disk Archives
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At the
back of the main circuit board, just in front of where the ribbon
cable connects to it, there is a 14-pin chip with a label "1F" beside it.
In drive A, there is an empty 16-pin socket beside it, with "2F" written
on the circuit board beside it. Drive B has something IN this socket - a
BLUE 16-pin chip.
The BLUE chip is a terminating resistor array and should be installed in
the last drive on the ribbon cable - the B drive. Leave it there. It is possible that the 14pin socket is the drive
selector.
It isn't. The cover article of the September 1984 issue of 80 Micro,
entitled "Drive Ways", has photos of Tandon drives that appear identical
to the ones in my Kaypros. The "DIP shunt for drive select" is in a
14-pin package, plugged into a 16-pin connector, just in front of the
14-pin chip I can see from the back of the drives.
I won't know if these drives have the "DIP shunt" or the thing you
describe until I get the drives out of the metal box. What you need
is what is called an Allen Wrench. They come in all shapes
and sizes.
Yeah, I've located precisely 40, in my father's toolbox, seemingly from
two identical sets. But none are the proper size.
It seems doubtful for an American product, but could these screws be
metric? Most tools in this house are still Imperial. :) Your friendly
local hardware store or electronic shop should
be delighted to sell you one or a set.
Now I have to go looking. :)
Doug Spence
ds_spenc(a)alcor.concordia.ca