Interfacting a VT-52 terminal
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by Bill Degnan - 08/29/2010 09:08 |
 This photo is a closeup of the M9970 console card after it had been moved into a more convenient location from the front of the bus. A continuity card was inserted in it's place. Click image for larger view. [NOTE: Since this post I moved the M9970 to the center of the first card slot per the card placement diagram on the chassis.]
The system and interface cable are set for a 110baud/20mAmp teletype if you connect directly with the console, but The goal is to use the M7856 serial/clock card for faster RS232 communications using a serial terminal like a VT-52. I do not believe the VT-52 that I have has a current loop option. The processor itself is OK, if you load and run the following program from 177700: 000240 000777 the computer will set the lowest address bit to 0-1-0-1 continuously. If you "run / halt" and observe the last light on the right (0); half of the time there should be a light. If it's always lit, or always not, there is a problem with the CPU at least. Check power supply. NEXT This page provides tips that relate to this project, the 11/10 is the same thing as the 11/05: http://www.shiresoft.com/pdp-11/11-10/index.html Here setup info http://www.pdp-11.nl/per...terface/dl11w-info.html The user manual http://www.bitsavers.org...-DL11W-OP-001_May77.pdf Google 177560, including in google books, you might find a page like this one http://www.fpns.net/willy/pdp11/pdptrbsh.htm http://ftp.wayne.edu/ibi...1/hardware/dl11-w.info2 http://www.conservatique.com/pdp/pdp-1105 Reply |
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