need some info on some sort of pocket terminal

From: Brent Hilpert <hilpert_at_cs.ubc.ca>
Date: Fri Sep 19 08:49:00 2003

Ed wrote:
>
> Not likely in this case, 2 of the wires must carry the power, as there is no
> own powersource in the terminal. I picked it up when collecting 4 11/34's at Shell,
> and in one of the cupboard I found this pocket terminal.
> I have opened the db25 plug, and pins 2 & 3 are wired, suggesting it is at least RS232.
> Other pins are 4 (RTS, wired also to pin 20), pin 7 (GND) and pin 9 (+ voltage).
> The pin assignment is according to the rs232 description.
>
> There is an N8T15 & N8T16 chip on the board, are these similar to the M1488 & M1489
> rs232 line driver chips?

... found listings in an IC Master (1982) (sorry no pinouts):

        N8T15 (Signetics): Line drivers, single-ended (2 per device)
                                / 4-input; RS232B,C; MIL188 / Output +-6V / Power Supply +-12V

        N8T16 (Signetics): Line receivers (2 per device)
                                / hysteresis EIA/MIL / Input Threshold +-2V / Supply Voltage 5V
Received on Fri Sep 19 2003 - 08:49:00 BST