24 Jul
2022
24 Jul
'22
7:28 a.m.
On 7/24/22 03:02, Rob Jarratt via cctalk wrote:
I am trying to work out why my PDP 11/24 CPU is not
working. To do so I want
to use my logic analyser on the F-11 chips. I have a regular 40-pin test
clip, but it doesn't make a good contact with the pins on the F-11 chips.
The test clips I have are made for regular DIP chips where the legs come out
horizontally from the side of the chip before turning 90 degrees and going
down into the board. On the F-11 chips the pins are pretty much stuck to the
side of the chip body and so the clip can't make a good contact.
Does anyone have any tips for attaching a test clip to the F-11 chips?
The test clips often have a "barrier" between the pins.
These may prevent the clip from fully closing onto the chip
body if the pins are flush, like a ceramic chip. It may be
necessary to carve away a bit of the barrier to make the
clip close the contacts down onto the chip's pins. The
barrier is there to prevent the clip from sliding out of
alignment with the pins, but it doesn't work on these
ceramic packages.
Jon