9 Sep
2015
9 Sep
'15
2:21 a.m.
On 2015-09-09 01:07, Charles wrote:
Several years ago, Vince Slyngstad and I
"cloned" the rare DKC8-AA
Programmer's Panel for PDP-8 with some improvements (0.6 vs. 0.3" LED
displays, real "click" buttons instead of that membrane keypad, and
fixed a couple of bugs in the original design). Also, since 8235's were
scarce even then, we used 74F244 buffers instead to gate the input vs.
output of the switch register onto the bus back to the M8316 Option 1
board.
Not sure what you mean by membrane keypad. My front panels certainly
have real buttons, which makes a clicking noise and feeling when I press
them. But maybe I'm confused and there is some membrane behind the keys
or something?
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol