After the success of the 5 prototype units of the #Numitron Hexadecimal display module , the 10 series units have been fabricated. I now have 15 hexadecimal modules :

• The 5 prototypes will be used for an "event counter". It could be a cycle counter, or a condition selected from a set of pulse sources.
• 2 modules for the PC
• 2 modules for the Imm8 section of the instruction
• 2 modules for SRC
• 2 modules for DST
• 2 modules for RES

Unlike the prototype modules, the new modules have their IV-9 soldered with the full length of the wires preserved, so they can be resoldered to fit a useful mechanical layout. I had to solder them anyway so the whole could be tested.

I'm pretty satisfied with the results, and now I have to build the other decoders for the remaining fields of the instruction word. I'll start with the @SRC, the COND and the @DST fields that are 3 bits wide each. The circuit has been covered already.

I must also work on the binary counter but I have no idea which project it belongs to. Probably here ?