Add a truth table to explain switch positions

[bmuessig]

Add a truth table to explain switch positions

[bmuessig]

Here's a full table of all possible programs, while I was at it:

01 23 | Function | Looped C equivalent | Description
----------------------------------------------------------------------------
00 00 | NOP, NOP | void; void;         | Do nothing
00 01 | NOP, INV | void; a=!a;         | Half frequency blink
00 10 | NOP, NOP | void; void;         | Do nothing
00 11 | NOP, HLT | void; while(1);     | Halt forever
01 00 | INV, NOP | a=!a; void;         | Half frequency blink
01 01 | INV, INV | a=!a; a=!a;         | Maximum frequency blink
01 10 | INV, NOP | a=!a; void;         | Half frequency blink
01 11 | INV, HLT | a=!a; while(1);     | Usually one state change, then halt
10 00 | HLT, NOP | while(1); void;     | Halt forever
10 01 | HLT, INV | while(1); a=!a;     | At most one state change, then halt
10 10 | HLT, NOP | while(1); void;     | Halt forever
10 11 | HLT, HLT | while(1); while(1); | Halt forever
11 00 | NOP, NOP | void; void;         | Do nothing
11 01 | NOP, INV | void; a=!a;         | Half frequency blink
11 10 | NOP, NOP | void; void;         | Do nothing
11 11 | NOP, HLT | void; while(1);     | Halt forever

Together with the reset button, you can even get some limited user input (e.g. inverse-useless machine with INV, HLT that toggles the LED on whenever you reset).

[naoto64]

@bmuessig
Thank you very much.
Added a table of circuit operation and switch positions to the document.

[bmuessig]

@bmuessig Thank you very much. Added a table of circuit operation and switch positions to the document.

That's great! Have a good 2024.