[cctalk] CoreNET PC-51 info (IBM 5110)

Is anyone familiar with PC-51 and/or CoreNET? These are IBM 5110/5120 related tools developed by an individual in the early 1980s. My understanding is PC-51 was an emulator that ran BASIC programs from the IBM 5110. One keyword new in the IBM 5110 was the "FORMS" keyboard, and you could define input fields (including type-formatting constraints, like sequence of letters and numbers) -- and once defined, you could relatively-easily store all the contents of the fields to a file (on tape or disk). I'm not entirely sure what format PC-51 supported (e.g. could read in ASCII text files containing the BASIC programs?). But I always imagined those customer data entry forms in old Radio Shack or Sears stores -- large department stores -- being developed in something like this. And CoreNET, I think was some kind of "null modem cable" that let the IBM 5110 communicate with an IBM PC 5150. The IBM 5110 has 3x DB25 connectors at the backside (and 1x DB15 cable like what became the "standard" joystick port on some systems in mid-late 1980s). The external tape and disk system would use these connectors -- with software driven from the ROS. I've always imagined it would be possible to "bit bang" across these external IO pins with some PALM-assembly -- the machine should be fast enough to encode 7-bit ASCII at 300 baud across those pins, maybe 1200. I'm not sure if CoreNET used or required any async card or the parallel communication card (that did IEEE-488), i.e. not sure if it was more than just a cable. But what's more interesting - apparently Sony is now the owner of both these assets, PC51 and CoreNET. Maybe Hal Prewitt sold it to them? Why would Sony be interested in it? Anyone happen to know anyone who works at Sony, or ideas on where to start on even "asking them" about it? Might be a lost cause these days. Anyone happen to have a copy of the old manuals of either of these? -Steve