Received the wrong information about a wire harness and ended up nuking a resistor network on an RQDX1 drive controller in a PDP-11/23+.
The blue 16 pin DIP chip itself is marked 1311003-01 and google can't find any sort of datasheet for the thing. Replacement will require it to be reverse engineered out of perfboard and resistors. I ended up having to resort to the schematics for the controller board and found it.
...thing is that I can't totally read what the hell is going on. This is the worst pinout for a component I have ever seen.
The chip itself is everything inside the dotted box. It consists of eight 220 ohm and eight 330 ohm resistors. I can see pins 1, 2, 3, 4, 5, 6, 7, 8, and 9. Pins 10-16 are not listed. I would assume from there that it means those pins were not used but the numbering scares me. Twice I can see pin 6 listed. One going to a data pin on another 74LS chip, the other noting 5V in. Either I can trust that and hope I don't nuke ANOTHER chip, or I ask someone else if I could have the pin number clarified.
The blue 16 pin DIP chip itself is marked 1311003-01 and google can't find any sort of datasheet for the thing. Replacement will require it to be reverse engineered out of perfboard and resistors. I ended up having to resort to the schematics for the controller board and found it.
...thing is that I can't totally read what the hell is going on. This is the worst pinout for a component I have ever seen.
The chip itself is everything inside the dotted box. It consists of eight 220 ohm and eight 330 ohm resistors. I can see pins 1, 2, 3, 4, 5, 6, 7, 8, and 9. Pins 10-16 are not listed. I would assume from there that it means those pins were not used but the numbering scares me. Twice I can see pin 6 listed. One going to a data pin on another 74LS chip, the other noting 5V in. Either I can trust that and hope I don't nuke ANOTHER chip, or I ask someone else if I could have the pin number clarified.
<----Computer says I need more beer.
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