So after being on a pesky vacation for a week, I put together a plan for construction of the TTL version. I wanted to be able to test as I go, so I figured I'd order the module construction sequence so I could check the system functionality before moving to the next part. Now I just have to acquire the parts...

1. Clock circuit with single-step mode
2. Program counter (low byte only)
3. Instruction ROM
4. Src and Dst registers
5. Control state machine - 3-bit shift reg
6. Decoding ROMs
7. Load reg
8. ALU A
9. ALU chips
10. ALU result reg
11. AEB register
12. Pointer address register
13. ROM data tristate buffer (read byte at PC)
14. PC buffer
15. Data Ram register (may need to modify to store lower 7 bits of either dst or src so they can be buffered to the ROM)
16. RAM
17. UART
18. Expand PC and data ram high byte