19 Mar
2013
19 Mar
'13
2:52 p.m.
> IBM PC used the SECOND position of those, (and
the Tandon TM100 drive had
> break-out DIP) and then played games with twisting parts of the cable.
On Tue, 19 Mar 2013, Tony Duell wrote:
Thos DIP shunt blocks are not that easy to find. There
are at least 2
workarounds, though. One is to fit a DIL header plug into the socket and
solder wires across it for the jumpers you want conncted. The other,
which involves n osolderign at all, is that there are now some quite
small DIP swithces, about the size of a normal DIL IC. Fit one of those
in the socekt and you cna easily make/break the jumper connections.
I used a STAPLE (straight out of the red Swingline) on my first one.
I only intended it as a temporary emergency measure to play with the
machine. It's over 30 years now; maybe I should replace the staple with a
proper shunt.
Onme advantage of the 'IBM twist' is that the
motor-on line for each
drive ended up on a differnet pin at the controlelr end. Thus the dirve
motors could be controlled independantly of each other.
Yes, there were good reasons for it, besides the inability of IBM store
personnel to be able to set a switch and terminator.
--
Grumpy Ol' Fred cisin at xenosoft.com