Editing 4BoD

[[File:4BoD_Logo.PNG|thumb|Logo]]

'''4BoD''' (4 Bits of DOOM) is a hyper-minimalist fantasy console inspired by Milton Bradley Microvision. It was created as an entry for [https://itch.io/jam/fc-dev-jam FC Dev jam] by [https://itch.io/profile/puarsliburf puarsliburf games] in 2017. Now there are lots of reimplementations, programming languages, and games.

==Capabilities==
'''Program memory''': 3072b (256 12-bit instructions).<br>
'''RAM''': 16 nibbles (64b).<br>
'''Screen''': 16x16 (1:1) 1-bit.<br>
'''Instruction set''': 16 instructions.<br>
'''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 AAAA
    0010 AAAA      - Sets memory position AAAA to the value stored in the accumulator
    0011 AAAA      - Sets the accumulator to AAAA
    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 AAAA, memory BBBB
    1010 AAAA BBBB - Flips pixel position memory AAAA, memory BBBB
    1011 AAAA      - Sets a flag called AAAA (Flag 15 is forever 0, bug)
    1100 AAAA      - Jumps to flag memory position AAAA
    1101 AAAA      - Only perform next action if memory position AAAA is equal to the accumulator
    1110 AAAA      - Only perform next action if memory position AAAA is greater than the accumulator
    1111 AAAA      - Only perform next action if memory position AAAA is less than the accumulator

==4BoD FC Family==
* '''4BoD''' by Puarsliburf.
** [https://github.com/oshaboy/4bod-reimplementation 4bod reimplementation] by [https://esolangs.org/wiki/User:Oshaboy Oshaboy]: 4bod reimplementation written in Python.
** [https://github.com/Sam36502/4BOD-C 4BOD-C] by [https://github.com/Sam36502 Sam36502]: C-reimplementation of 4BOD Fantasy Console using raylib.
** [https://github.com/Sam36502/4BOD-Go 4BOD-Go] by [https://github.com/Sam36502 Sam36502]: A Golang reimplementation of 4BOD fantasy console.
** [https://github.com/ItsYurix/NibbleStudio 4BoD-SB](NibbleStudio Micro0.1) by [https://github.com/ItsYurix Yurix]: Implementation in Small Basic with pauses, restarts.
*** [https://github.com/ItsYurix/NibbleStudio 4BoD-CS](NibbleStudio Micro0.2+) by [https://github.com/ItsYurix Yurix]: A C# reimplementation, works faster.
* [https://github.com/Sam36502/4BID-N 4BID-N] by [https://github.com/Sam36502 Sam36502]: A 4-Bit Fantasy Console heavily inspired by the 4BoD console by Puarsliburf.
** [https://github.com/Sam36502/4RCH 4RCH] by [https://github.com/Sam36502 Sam36502]: A 4-bit fantasy console/computer.
* [https://itsyurix.itch.io/blip-4-fc BLIP-4] by [https://github.com/ItsYurix Yurix]: Fantasy console inspired by Microvision, NES, 4BoD, 4BID-N.

[[Category:Fantasy consoles]]
[[Category:4 bit consoles]]
[[Category:Memory-mapped systems]]