Big Decisions

This page  documents the main design decisions and gives some background on each.

Transistors, diodes and resistors


These are the basic building blocks of electronics.   On the plus side they taught at GCSE/A-level, on the negative side there's a lot to wire up.  Easy to put a good number of LEDs in place to see the state.   Relays are simpler, but much slower and so not able to run games.   Integrated circuits are faster and cheap, bu tare black boxes and can't wire in LEDs to see state.


Size


1m by 1m (expected).   It should fit in a car, be mountable on a wall and be visible from the back of a large lecture theatre.

Processor only


RPi Hosted


16 bit architecture


Small instruction set


  lack of push/pop

little/big endian


Third/Forth


non-standard

Descending stacks


fbcc