Hello PDP masters,
I recently acquired a PDP 11/05 computer, yaaaay.
It's the low-profile one.
It is complete and it runs (after some power supply repairs), but has no peripherals.
So I want to use an M9312 "serial console monitor" card (which I also bought) to interface with it over serial interface, from a PC.
My 1st hurdle is hooking up a USB-to-TTL converter (such as the one frequently used on Arduino Uno boards) to the BERG 40-pin uart/serial/whateveryoucallit connector on the back of the PDP.
I found the nice instructions at https://www.retrocmp.com/how-tos/in...interfacing-with-a-pdp-1105-sorting-the-wires
Buttt....
1. I don't know which pin on my connector is "A". The article above is super confusing, talking about reversed pins, upside pins, etc. They could just tell me where my pin A is![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
2. The "BB" pin should measure -15V. It's the 12th pin on one of the rows. I measured the voltage on the 12th pin from any direction (top row left to right, right to left, then bottom row left to right, right to left, and neither of them measures -15V. So I am quite stuck at this point.
Here are the voltages I measured (in volts) after turning on the PDP:
Top row: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,0,
Bottom row: 0,0,5,0,5,0,0,-15,15,0,0,4,5,-15,5,-15,0,0,3,0
I will appreciate if someone can tell me: do I have a non-standard BERG conector (given the weird voltages above), and which pin is "A"?
Thank you!
Below I am attaching a picture of the BERG slot , with an empty connector plugged into it (so that the pins are more visible).
I recently acquired a PDP 11/05 computer, yaaaay.
It's the low-profile one.
It is complete and it runs (after some power supply repairs), but has no peripherals.
So I want to use an M9312 "serial console monitor" card (which I also bought) to interface with it over serial interface, from a PC.
My 1st hurdle is hooking up a USB-to-TTL converter (such as the one frequently used on Arduino Uno boards) to the BERG 40-pin uart/serial/whateveryoucallit connector on the back of the PDP.
I found the nice instructions at https://www.retrocmp.com/how-tos/in...interfacing-with-a-pdp-1105-sorting-the-wires
Buttt....
1. I don't know which pin on my connector is "A". The article above is super confusing, talking about reversed pins, upside pins, etc. They could just tell me where my pin A is
2. The "BB" pin should measure -15V. It's the 12th pin on one of the rows. I measured the voltage on the 12th pin from any direction (top row left to right, right to left, then bottom row left to right, right to left, and neither of them measures -15V. So I am quite stuck at this point.
Here are the voltages I measured (in volts) after turning on the PDP:
Top row: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,0,
Bottom row: 0,0,5,0,5,0,0,-15,15,0,0,4,5,-15,5,-15,0,0,3,0
I will appreciate if someone can tell me: do I have a non-standard BERG conector (given the weird voltages above), and which pin is "A"?
Thank you!
Below I am attaching a picture of the BERG slot , with an empty connector plugged into it (so that the pins are more visible).