Configuration test
There are 4 diode positions on the Scan PCB which set various options. 2 Are normally fitted, giving 80 step (not 50 step) programs and 10 (not 4) data registers. One of the other diodes exchanges the positions of the ln/log and exp/10^x functions, the last one appears to have no effect. Here, a DIP switch is temporarily soldered to the Scan PCB so as to be able to switch the diodes in and out of circuit to investigate their functions
Configuration test
There are 4 diode positions on the Scan PCB which set various options. 2 Are normally fitted, giving 80 step (not 50 step) programs and 10 (not 4) data registers. One of the other diodes exchanges the positions of the ln/log and exp/10^x functions, the last one appears to have no effect. Here, a DIP switch is temporarily soldered to the Scan PCB so as to be able to switch the diodes in and out of circuit to investigate their functions