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PDP-8 TTY Read Characters With Count in MQ


This program reads characters from the TTY and keeps a count of the characters in the MQ. Obviously, you will need an EAE in order to display the count value in the MQ :-) When no characters are arriving, the MQ will not increment. I use this to diagnose my home-built W076 card.


0000 6032 kcc / clear keyboard flag wait, 0001 6031 ksf / skip if keyboard flag is one 0002 5001 jmp wait / loop waiting for a character to arrive 0003 7601 cla / wipe accumulator in preparation for increment 0004 2017 isz count / increment count 0005 7000 nop / we don't care about the "skip" facet of the ISZ 0006 1017 tad count / get count 0007 7421 mql / stash count into MQ, clearing AC 0010 6036 krb / read character 0011 5001 jmp wait / wait for next character count, 0017 0000 / counter value
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