[sdiy] Sequential Circuits Mystery Board

[greg montalbano]

I've recently acquired what appears to be a six-voice synth board by SCI;
http://home.earthlink.net/~klosmon/

The only info printed on the board is "1983 Sequential Circuits, Inc   Z-315",
and on the back: "PC099-1   REV A1".

Each of the voices consists of a CEM 3394 (as in the SixTrak, Max, etc) and 
an attendant 4051 CV demultiplexer;  the whole driven by a Z80 CPU with two 
4016 RAMs (no battery backup) and a 6850 UART.
What appears strange to me is the lack of inputs & outputs for the 
board;  there's only one ten-pin connector -- four pins are power supply 
connections to the onboard regulators, two are to the UART data Tx & Rx 
lines, one is the buffered output buss from the CEM chips, and I'm not sure 
yet about the others.
Anybody have any clues as to the origin & purpose of this board?

Thanks.

~GMM   (the OTHER other white meat)