ScrapMechanic 4hz 8bit programmable CPU made from over 6000 logic-gates.
Comes with pre-programmed fibonacci and a 7-segment display hooked up to it.
- press the button closest to the display to reset the program counter.
- enable every switch, the last one being the closest to the display.
- watch it do it's thing until it overflows (it will keep on going, though)
The program memory is the largest component. It has 256 12-Bit rows, colored yellow and green.
Programming is done by changing logic-gates to NOR / OR, so that their default state (without inputs) changes.
To start programming, disable the switch located on the front of the program memory to enter human-readable-mode.
| Binary | Opcode | Description |
|---|---|---|
| 00000000 | HLT | Halt |
| 00000001 | LDA | Load from instruction to A |
| 00000010 | LDB | Load from instruction to B |
| 00000011 | STA | Store from A to memory adress |
| 00000100 | STB | Store from B to memory adress |
| 00000101 | STC | Store from C to memory adress |
| 00000110 | MEA | Load from memory to A |
| 00000111 | MEB | Load from memory to B |
| 00001000 | ADD | A+B=C |
| 00001001 | SUB | A-B=C |
| 00001010 | CMP | Compare A and B into C, if true c=00000001 else c=00000000. Adress 01 for >, adress 00 for <, adress 10 for == |
| 00001011 | JMP | Jumps to adress in program memory |
| 00001100 | JIF | Jumps to adress if C = 00000001 |
| 00001101 | OUT | Outputs memory adress to screen |
| 00001110 | ||
| 00001111 |
- CLR adder
- comparisons
- multiplication
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