Welp... It seems that I have a serious case of NERD at the moment...
I have no idea why, but I am seriously considering DIYing my own 16 bit minicomputer, built with mostly discrete parts in diode transistor logic, and a register to register Von Neuman architecture, with a reduced instruction set...
Though I will draw a line at interfacing, memory and mass storage. Those would be using ICs and micro controllers...
On self made PCBs...
Though... First I'd have to find cheap and useful Schottky diodes, transistors and test them for speed response when used in a DTL circuit...
Should be relatively easy with a signal generator and an oscilloscope...
Just put down the design for a simple 4 bit sliced ALU that I might implement for my DIWhy mini computer, created with the logic simulator program Digital, which is an easier to use LogiSim like program.
Possible operations are, Not A, A and B, A or B, A xor B, A + B, A + 1, A - B and A - 1, as well as checks for A == B and if Out == 0.
It also got its name, DWMC-16, for DIWhy MiniComputer 16-bit.