4BoD

Logo

4BoD (4 Bits of DOOM) is a hyper-minimalist fantasy console inspired by Milton Bradley Microvision. It was created as an entry for FC Dev jam by puarsliburf games in 2017.

Capabilities

Program memory: 3072b (256 12-bit instructions).
RAM: 16 nibbles (64b).
Screen: 16x16 (1:1) 1-bit.
Instruction set: 16 instructions.
Sounds: no.

Instruction Set

Instructions set (from)

OP |A |B |Description 0000 - NOP

0001 AAAA - Sets the accumulator to the value stored at memory position A 0010 AAAA - Sets memory position A to the value stored in the accumulator 0011 AAAA - Sets the accumulator to A 0100 - Sets the accumulator to the buttons that have been pressed - Ones place = left button - Twos place = right button - Fours place = up button - Eights place = down button 0101 - Increments the accumulator (Do this 15 times to make a subtraction by overflow)

0110 - Clears the screen 0111 - Shifts the accumulator left 1000 - Shifts the accumulator right 1001 AAAA BBBB - Sets the accumulator to pixel position memory A, memory B 1010 AAAA BBBB - Flips pixel position memory A, memory B

1011 AAAA - Sets a flag called A (Flag 15 is reserved, if you jump to it the program ends) 1100 AAAA - Jumps to flag memory position A

1101 AAAA - Only perform next action if memory position A is equal to the accumulator 1110 AAAA - Only perform next action if memory position A is greater than the accumulator 1111 AAAA - Only perform next action if memory position A is less than the accumulator