Character Echo Program
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by Bill Degnan - 06/04/2011 21:58 |
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The following UART sample program from the PDP 11/05 user manual is supposed to print whatever character you type on the TT keyboard onto the teletype's printer as if you were in LOCAL mode. I got help to convert this program to octal from RSX11M+ of the vintage-computer.com forum. THANKS!
005000 CLR R0 105737 TSTB @#177560 177560 100375 BPL -3 105737 TSTB @#177564 177564 100375 BPL -3 113737 MOVB @#177562,@#177566 177562 177566 105737 TSTB @#177564 177564 100375 BPL -3 110037 MOVB R0,@#177566 177566 105737 TSTB @#177564 177564 100375 BPL -3 000756 BR -16 ---- Problem is, it does not work. When I run the program the teletype buzzes but no chars are echoed to the printer. When I switch off the teletype with the program still running and then turn on again, the printer sends a string of FFFFFFFFF... chars to the teletype. Why? Reply |
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