RTS and CTS sound quite promising! According to the 2SIO MITS manual, I can read the CTS bit (bit 3) from the ACIA status register. Based on this handy 2SIO echo routine (
http://www.solivant.com/altair_bootload ... rs&pagen=1) I believe I can do:
IN 020
STA (lb) (hb)
and then examine the memory address A was dumped into to see the status register. Is this correct?
Thus my octal for front-panel entry would be:
000: 333 020 062 100 000 303 000 000
Which I believe is
IN 020
STA 20h
JMP 00h
When I run this (on my Altair Micro 8800 that I just got!) I get either a 2 or 3 in memory location 20h. Curious. I *think* this means that RDRF is full (I mashed some keys on my terminal) and TDRE is empty. (Receive buffer full and transmit buffer empty, respectively.)
Am I on the right track?