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With current master branch (hash: f5c948f with the patch below) 0.51.18 on a handwired protoboard using a PJRC Teensy 3.1 and SN75160/SN75161 transceiver chips.
I started to play with AR488 in order to talk to an HP 7440A Pen Plotter. Not getting any response, I began probing with a DVM and ++xdiag, and found that two pins (SRQ and DAV) leading to from the Teensy to the SN75161 were not asserting successfully, instead of zero volts, I see about 0.5V instead, not low enough to cause the GPIB side of the SN75161 chip to go low. I don't see an electrical problem on the board (no shorts or opens that I can find).
The text was updated successfully, but these errors were encountered:
I'm a big fat dummy. READ THE DATASHEET. Page 2 of the SN75161 explains that TE and DC low force SRQ and DAV to receive mode. So, ++xdiag for those bits are going to give confusing results when connected through SN7516X chips.
With current master branch (hash: f5c948f with the patch below) 0.51.18 on a handwired protoboard using a PJRC Teensy 3.1 and SN75160/SN75161 transceiver chips.
I started to play with AR488 in order to talk to an HP 7440A Pen Plotter. Not getting any response, I began probing with a DVM and ++xdiag, and found that two pins (SRQ and DAV) leading to from the Teensy to the SN75161 were not asserting successfully, instead of zero volts, I see about 0.5V instead, not low enough to cause the GPIB side of the SN75161 chip to go low. I don't see an electrical problem on the board (no shorts or opens that I can find).
The text was updated successfully, but these errors were encountered: