Micro Palm Computers PC/5000: Part 1
14The PC/5000 is the big brother to MPC's PC/4000 - handheld IBM PC compatible machines running MS-DOS.
Both machines run on the same hardware (an 80C88) and have 256KB of system RAM. The PC/4000 has two built-in 256KB storage modules whereas the PC/5000 has a built-in 1024KB storage module and space for a second module that can be added without opening the machine - mine has a second 1024KB storage module.
The PC/4000 is a 1988 manufacture and this PC/5000 appears to be a 1991 manufacture.
This particular machine came with a GE "Type SC-2 Smartcoupler" attached to the DD50 port. I have no information about this attachment apart from it having a catalogue number of "9937450G3". It may have had a barcode wand attached to it - it has a cable that has been cut ... ? It has an 8-bit microcontroller on board (a Motorola MC68HC70508CFN).
I have updated the pinout document on my Github with the Smartcoupler details:
https://github.com/0ddjob/MicroPalm-PC-4000