__ __ /\ \ /\ \ 000 | LDA | Z | A = [X] / \ \ / \ \ 001 | NOR | Z | A = A NOR [X] / /\ \ \ / /\ \ \ OOO D Z XXXXXXX 010 | ADD | C | A = A + [X] / / /\ \ \\/_/\ \ \ \ \ \ \____ Operand 011 | SHR | C | A = [X] >> 1 / / / \ \_\ / / / \ \ \________ Zero Page 100 | LEA | - | A = X / / / __/ / / / / / \ \_________ Dereference 101 | STA | - | [X] = A / / / /\ \/ / / / / __ \___________ Opcode 110 | JMP | - | P = X / / /__\ \ \/ / / /_/\_\ 111 | JFC | - | if !F: P = X / / /____\ \ \ / /_____/ / \/________\_\/ \________/ joewing.net
The Q2 is a 12-bit bit-serial single-board discrete transistor computer. In other words, it's a complete computer system on a single printed circuit board (PCB) whose CPU is made out of roughly 1000 discrete transistors. The Q2 is implemented on a dual-layer PCB using surface mount components, allowing the board to be produced and assembled almost entirely by machine.
The video above is a quick demonstration of the Q2. First the Q2 is programmed via a Raspberry Pi Zero and then the program is run at 80 Hz (the slow clock). The program is available here.