IBM PCradio 

The PCradio was released in late 1991. Designed primarily for mobile workers such as service technicians, salespersons and public safety workers, the PCradio featured a ruggedized build with no internal hard disk drive and was optioned with either a cellular or ARDIS RF modem, in addition to a standard landline modem.

I had been looking for one of these for a while and this one showed up in Italy. It took a lot of effort to get the seller to ship this item, but we got there in the end and it arrived in perfect condition, but missing it's power supply.

It's mono display works in CGA mode with 80 column by 25 text. Storage was on SRAM instead of a hard disk drive. There was a landline and a cellular model and the cellular one could apparently have an attachable handset.

Here is an original newspaper article talking about the new technology. 

Power Supply Pinout

I do intend to build my own power cable and have been given the pinout by a fellow owner:

Looking at the power supply pin holes: Centre hole and and 3 surrounding holes at 10, 2 and 6 o'clock respectively:

Centre - Negative / Black probe on centre, 

10 o clock = -9vdc,

6 o clock -8.73vdc,

2 o clock 0v.