Address decoder
October 15, 2022
This is what it maybe looks like when it is finished:
virtual complete program counter
These "shelves" on the back side split a binary number into a single bit. The black slots represent all 256 lines of code.
And here are the splitter in real:
make splitter boards
small splitter parts
Diodes are soldered
the splitter
Update from January 2023:
122 lines of possible program code are finished until now.
skyline1
skyline2
skyline3
look from behind
In total, 128 mini boards are needed for 256 lines of maschine language code.
more
FINISH (Update from March 2023)
This decoder would be easy to extend because I added 2 extra pins on the parallel bus. 512 lines of code would be painless.
top view
side view
And as usual the possible addresses go from 0 to 255.