No, this keyboard is not AT compatible. It uses a different protocol.
I have a 3192, but I don't have a keyboard for it yet, so I don't know if it
differs from the RJ45 style terminal keyboards in just connector or if the protocol is
different too. Neither are AT-compatable though.
There is a device called a Soarers converter (unsure on spelling) that will convert it to
USB and allow it to act as a normal HID keyboard. I haven't played with mine enough to
know how well it works, so YMMV.
________________________________
From: Charles Dickman via cctalk <cctalk at classiccmp.org>
Sent: Wednesday, 22 August 2018 20:16
To: General Discussion: On-Topic and Off-Topic Posts
Subject: IBM Model M keyboard for 3192
I got a box of miscellaneous model M keyboards last week. One of them
has 122 keys and the connector is the size of a PC/AT type circular
DIN connector, but the 5 pins are spread over 240deg instead of the
AT's 180deg. The part no. is 1390702 and a little research found it is
from an IBM 3192 terminal.
Is it electrically/protocol compatible with the PC/AT and PS/2
keyboard or a different animal completely?
-chuck