hit a road block with the discrete transistor computer project yet again

there's this computer someone made with TTL chips that has brainfuck as its ISA

it is appealing to make in a discrete transistor design because it has no registers or an ALU

however, these 74193 ICs are horrendously complicated--up/down counters with all the loading/clearing/presetting logic

up/down counters are by themselves easy, they're just chained Toggle flip flops

this is the low power schottky (LS) version, the HC version uses 3 XOR gates which are a nightmare to build