Womble
Well-known member
Hi Folks, I have a scruffy bootleg 1942 on the test bench at the moment and am at the stage where a working board would be really bloody helpful. Has anyone here got a 1942 (bootleg or original) board, plus either a logic probe or a scope and about ten minutes free to check a couple of things for me?
The only problem I have is that the bootleg board doesnt have any silkscreen grid locations on it so it might be hard for me to describe the chips in question.
First off - with the board in front of you and the edge connector pointing to the left, there are two 74LS174 chips, one above the other in the second column to the right of the edge connection, just above the dipswitches. I need to know what pin 9 on the 174s is doing, ie if its high, low or active, pin 9 is common on both 174s by the way.
The second bit I need my notes at home to describe, but I think I have a rotten track, I have a line that goes to the edge connector between boards, but never makes it to anywhere on the other board, might be corrosion on my chip legs leaving me without a beep on the continuity meter.
Shame there are no 1942 schematics out there
Thanks if anyone can help!
The only problem I have is that the bootleg board doesnt have any silkscreen grid locations on it so it might be hard for me to describe the chips in question.
First off - with the board in front of you and the edge connector pointing to the left, there are two 74LS174 chips, one above the other in the second column to the right of the edge connection, just above the dipswitches. I need to know what pin 9 on the 174s is doing, ie if its high, low or active, pin 9 is common on both 174s by the way.
The second bit I need my notes at home to describe, but I think I have a rotten track, I have a line that goes to the edge connector between boards, but never makes it to anywhere on the other board, might be corrosion on my chip legs leaving me without a beep on the continuity meter.
Shame there are no 1942 schematics out there
Thanks if anyone can help!

