25 Feb
1999
25 Feb
'99
3:42 a.m.
I used to have a 745 about 20 years ago. I eventually gave it to
somebody who needed it more than I.
There was a jumper inside that controlled whether the modem and terminal
sections were connected to each other. By setting that, (I do not
remember which jumper) I was then able to cable the terminal to operate
as a printer for a TRS-80, as well as using the modem for the TRS-80. By
making up a special loop-back cable (in the connector hood), it was still
possible to use the modem and terminal with each other.
Be aware that there are a number of variant models, with differing features.
--
Fred Cisin cisin(a)xenosoft.com
XenoSoft http://www.xenosoft.com
2210 Sixth St. (510) 644-9366
Berkeley, CA 94710-2219
On Wed, 24 Feb 1999, Marvin wrote:
Rick Bensene wrote:
The machine is a "Model 745 Portable" with built-in acoustic coupler
cups at the rear of the machine. It works at 300 or 110 baud.
The first question for y'all is this: On the
rear panel of the machine is
a DB-15 male connector...my assumption this is for hooking up a (RS232 or
current-loop) 'direct connection' to the terminal. I don't have any
documentation
for the machine, and am wondering if anyone out there might know the pinout
for this connector.
According to the tech manual, it sounds like the port is the EIA/Auxiliary
Coupler and the cable has one 15 pin connector attaching to the 745, and two
other cables.
(Keyboard/Printer EIA Interface)
P1-9 ..... P2-1 Protective Ground
P1-13 ..... P2-2 Transmit Data
P1-12 ..... P2-3 Receive Data
P1-10 ..... P2-4 +12v to RTS
P1-1 ..... P2-7 Signal ground
P1-11 ..... P2-8 Data Carrier Detect
P1-15 ..... P2-20 Data Terminal Ready
(Acoustic Coupler EIA Interface)
P1-8 ..... P3-3 Receive Data
P1-3 ..... P3-2 Transmit Data
P1-1 ..... P3-7 Signal Ground
P1-2 ..... P3-8 Carrier Detect
P1-9 ..... P3-1 Protective Ground
P1-6 ..... P3-5 Clear to Send
P1-7 ..... P3-6 Data Set Ready
Hope this helps.