Find: "Z80 Starter Kit" - any hints?

Yo, Z80 Starter Kit SDS SD Systems (C) 1978 MICRO DESIGN CONCEPTS It packs a Z80 w/PIO and CTC, 8 socketed 2101L RAMs (and room for 8 more!), a prototyping area (with labeled address and data bits right there), and two (unpopulated) S-100 slots (with pads for -/+16V and +8V) In addition, there's jacks for a cassette tape drive (and buttons labelled "cass load" and "cass dump"), and below the ROM socket (w/masked programmed ROM "Z-BUG"), a toggle switch ("PGM"/"READ") and a 24-pin DIP socket marked "PRO PROGRAMMER". With all that, I still have questions: o Is there any info on this? It looks much like a SYM-1 or Elf of the day, but with a Z-80. o What ROMs might it program? 1702? (unlikely because of a lack of odd power supply voltages) 2708? There is a pad at one edge of the board that snakes over to the PGM/READ button, marked +25V. I simply do not know which particular 1978 ROMs used that particular programming voltage. o Why might I have heard of "Z-BUG"? Was it a famous monitor program for the Z-80 boards of the late 70's? o If I can't find a good use for this, does anyone want to make me an offer for it? I promise that I won't just go out and post it on E-overpay. Thanks for any hints. I'd love to learn more about the history of this thing. I just got it because it was a) affordable, b) a 1970's SBC, and c) it has a place to add cards and my own circuits, should I decide that's worth the effort. I could always wire on a 6164 RAM and a SCSI chip, but then what would I do? -ethan