John -- I think Greg means the 8-pin DIN, not the mini-DIN ....
No. The PSK-1 RS-232 port to the Computer is J10, which is a mini-8 DIN on rear panel. I am looking at the back panel of my PSK-1 here in workbench!
The PSK-1 also has 8-pin DIN (J2) for the TNC Modem Connection (via 20-pin TAPR disconnect header on Tiny-2 or TAPR TNC-2); and three 5-pin DIN connections: TNC Radio Connection (J4); VHF Radio (J1); UHF Radio (J3) --- the separate VHF and UHF radio connections were useful for the Icom VHF/UHF radios (271/471; 275/475) of that era.
The PSK-1 and PSK-1T modems do have different rear panel connector types! LOOK at the REAR PANEL (eBay auction # 320392587069 has a rear panel photo) On the PSK-1T, there is an 8-pin Mini-DIN marked CONTROL (RS-232), I assume that Gywn kept the pin out the same as the PSK-1 and would connect this to a PC serial port (RS-232) that is running a terminal emulation or control program. To the left is a Male DB-9 marked PACKET (RS-232) ... A manual for the PSK-1T will confirm its usage/connections.
As I remember, and W3IO probably has a better memory, PacComm introduced the PSK-1 for the PacSats launched at that time. Later, Gywn reintroduced the PSK-1T with some updates and suggested modifications. I first saw a PSK-1T at the 1995 AMSAT meeting in Orlando (1995) --- shown in preparation for AO-40.
Greg -- You apparently outbid me for these items on eBay, assuming you recently obtained them ;-) ) I've been using it to command AO-16... I don't know about the DFM unit, other than I think it is probably 1200 and 9600 baud capable.
Mark, I was watching that eBay auction (# 320392587069), but did not bid on these items -- I already have one! There were two PacComm PSK-1 and DFM TNC combinations for sale on QRZ a couple of weeks ago at $35 per set or $50 for both (great deal)! Yes, the DFM permits usage at 9600 AFSK (which one of the satellites did support).
Greg w9gb