Bit Banger(s) we all have known.

ard at p850ug1.demon.co.uk (Tony Duell) said: <<<deletia>>> Well (since you asked) the original serial interface for the HP 2116 computer (around 1966 or so) was a serial bit-banging interface. You needed to assemble the byte from the ASR-33 (or 35, take your pick) teletype a bit at a time. They later had the bit assembly/disassembly register (this WAS pre UART chips) that did al the work. Unfortunately the "parallel" serial interface was only half duplex, as it used the same register for both assembly and disassembly. The "serial" (bit- banging) serial interface IIRC did not have this restriction. Ah, history... -- Tom Watson tsw at johana.com ____________________________________________________ Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs