Mystery box

pinout on db-37 suggests power on orange leads to pins 37-35 (or 36) heavier guage wires that go to board and have different shrink insulation (blue) at the board. the p1 and p2 switches were removed, but could be reinstalled, since the wires are showing dangling in photo 14 in the upper left. LED's probably are not driven directly, due to transistor (2222's?) which are across the top of the board. There is a 74123 monostable, which may be used for clocking. Interesting to have bcd -> decimal, that may be used for either actual decode, or was frequently used as a selector if you had under 10 total things to gate. parts list: 4ea 74L02 quad 2input nor 2ea 74L42 BCD to Decimal Decoder 3ea 7404 hex inverter 2ea 74ls181 4 bit alu 1ea 74L75 4 bit bistable latch 1ea 74123 monostable 2ea 74ls83 4 bit full adder fast carry 1ea 74ls75 dual 4 bit latch 1ea 74ls76 jk flipflop 1ea 74ls00 quad dual input nand Stefan wrote: