Here are some long-awaited screenshots!
Many of these components were constructed before I knew exactly where I was going with this, so there will probably be some vestigial wiring when this is all said and done.
Most of what I've built so far
The pink and purple lines will soon be parallel ports. The different colored lines (red, white, green, cyan) correspond to segments of each command, which are stated in an above post.
I originally built this as a brute-force way to turn decimal into binary, but I found a better way. It may be used for something else in the future though.
Yes, I know it isn't as well optimized as the other ones out there, but I was building this from sheer logic gate knowledge, not online cheats. There will probably be a dozen of these, with subtraction included, in order to create a usable math chip.
I built this area a while back when the "programmable" aspect of this computer was not yet solidified. I will still probably use it, but disconnect it from the bussing it was linked to and instead use a parallel port.
7-Segment Display and Converter
This 7-segment display panel can show 4 digits, take an input similar to BCD, and output operation symbols. The wiring in the back is the BCD to 7-seg converter.
Non Volatile Memory (4 Bytes)
I don't think I'll be needing this, but I keep it around. There are 4 bytes of input and one reset button, which when pressed will write the input to the output of the memory and keep it that way until reset is pressed again. Utilizes the repeater signal locking function.