13 Feb
2015
13 Feb
'15
7:41 p.m.
At 08:14 PM 2/13/2015, Ben wrote:
The alu has never relay been a problem with relays, but what about main storage? Punched
tape (paper/film/card) is no longer with us for I/O.
Fifty years ago I got around that by building my own card reader (very slow) for input and
hand-punching Hollerith cards with a hole punch. That was some years before I got access
to an IBM card punch in high school. Output was a set of electro-mechanical counters, and
they were a real pain to implement.
Dale H. Cook, Roanoke/Lynchburg, VA
Osborne 1 / Kaypro 4-84 / Kaypro 1 / Amstrad PPC-640
http://plymouthcolony.net/starcity/radios/index.html