Pins
a-g and "," : display segments and decimal point
G1 to G13: display grid signal for each digit, and keyboard multiplexing
K0 to K3 and K0' and K3': keyboard and switch multiplex lines
TM, MT, S, RP and ZT are printer controls
MS1 and MS2 are rounding and fixed decimal controls
ACL looks like a clear on power up automatic clear

Voltages are given for this example
VLL  -30V
VGG -15V
Vss 0V