6 Jul
2009
6 Jul
'09
10:31 p.m.
Richard wrote:
In article
<FF6AB92D97A23A409701CDBF66F03FCD30CBA6F0 at 505fuji>,
Ian King <IanK at vulcan.com> writes:
See Spare Time Gizmos for a very small dumb terminal. This is the cheap
video cookbook
idea taken to the fullest. 2 1/2" x 4" PCB gives you every thing you
need but a CASE and
a 9 volt wall wart. You don't get a ADM3A but a VT220 instead. How ever
if you
want you can reprogram the CPU to emulate I guess almost any kind of
basic terminal.
Ben.
http://www.sparetimegizmos.com/Hardware/VT.htm
Oops, my bad: the ADM5 was hardwired as well.
[...]
After you mentioned that the ADM3A was discrete logic, I went to
bitsavers and perused the maintenance manual. The theory of operation
section makes it quite clear that its all discrete logic doing the
row/column counting and character decoding. For some reason, I
thought that the ADM3 was microprocessor based. I guess I never
really looked that carefully inside! I have a number of terminal
and graphics devices that are discrete logic and I find them
interesting.
I wonder how small an FPGA could be and still contain all the ADM3a
discrete logic :-)