http://www.hpmuseum.net/display_item.php?hw=95
That's the machine which triggered off my interest in computing. 1.0MHz clock speed. 1 clock cycle per instruction. Assembler, FORTRAN, ALGOL, and BASIC. Real core memory, ~$3,500 for 8K 16 bit words Booting? What's that? 017700 in the switches to load from program from paper tape. 0100 to start program. ( iirc, but probably not ) http://www.cs.ubc.ca/~hilpert/e/HP21xx/CTL.html Chips were Fairchild CTµL - Complementary Transistor MicroLogic. None of this common or garden low-life TTL stuff. Bar the failure of one gate ic on an I/O card, the machine worked faultlessly all the while I was using it. http://www.hp9825.com/html/hp_2116.html Notice ASR33 teleprinter to left of top 'photo. I'm sure that sitting by one of those clattering away for 4 or 5 years is what caused my deafness. Oh the nostalgia! You youngsters don't know how lucky you are. :-) -- Sincerely etc. Christopher Sawtell
