19 Jun
2013
19 Jun
'13
12:06 p.m.
On Tue, Jun 18, 2013 at 07:33:51PM +0100, Tony Duell wrote:
I thoguth the RS232 versions at least had one output (DTR?) and one input
(DCD) per port other than the data lines. Maybe another one too. The 8
DCDs are accessed as a single 8 bit register, dittor the DTRs.
The DZ11 wsa the first Unibus periperhal card I ever owned (even before a
DL11), and I rememebr level-shifting a paper tape reader to RS232 levels
and feeding it in on the DCD lines with one of the DTR lines used to step
it on a character. Oh well...
The EIA one has a pair of 50 pin filters mounted
ona sub-panel that fits
behind the normal distribution panel. There's a whort ribbon cable that
links one side of the device to the header on the distribution panel PCB,
the cable from teh Unibus card goes on the other side.
Same deal on the 20 mA, except that they're only 40 pins (which figures --
it really is possible to have *less* modem control than a DZ11A, i.e. none
whatever, and no "reader run" either for that matter). If this happened to be convenient I'd *really*
appreciate it please!
It's a matter of me remembering where I've put one of those filters...
-tony