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