[cctalk] Bit-banging nightmares, wa: Re: Re: RS232 then and now (bitbanging)

I am reminded of the Regitel system, a POS system from the early 1970's.  We ran 64 model 33's off of a three-or-four board Regitel mux on a Nova 800; you'd basically load a bunch of registers with the current bit for each port and it would bang them out; input was the reverse.  It was on the processor to the requisite mask-and-shift operations to get the bits to the right place. An image of the cover of the Registel System glossy simply screams 1970's: https://learninglab.si.edu/resources/view/4446092 -- Christian Kennedy, Ph.D. chris(a)mainecoon.com AF6AP | DB00000692 | PG00029419 http://www.mainecoon.com PGP KeyID 108DAB97 PGP fingerprint: 4E99 10B6 7253 B048 6685 6CBC 55E1 20A3 108D AB97 "Mr. McKittrick, after careful consideration…"