Warning: this is not complete or useable, even for trivial programs completely broken.
A 16-bit stack-based virtual machine that works with packed instructions. It features 64k of memory and two 256-deep 16-bit stacks, and it comes with a trivial assembler written in Python.
1###############
: Pushes # on the data stack.
0AAAAABBBBBCCCCC
: Executes the instructions A, B, and C.
| Mnemonic | Stack effect | Other effects | |
|---|---|---|---|
| 0x00 | NOP | ||
| 0x01 | DROP | a -- | |
| 0x02 | SWAP | a b -- b a | |
| 0x03 | ROT | a b c -- c a b | |
| 0x04 | DUP | a -- a a | |
| 0x05 | PEEK | a -- S[a] | |
| 0x06 | ADD | a b -- a+b | |
| 0x07 | SUB | a b -- a-b | |
| 0x08 | MUL | a b -- a*b | |
| 0x09 | DIV | a b -- a/b | |
| 0x0A | MOD | a b -- a%b | |
| 0x0B | NEG | a -- -a | |
| 0x0C | AND | a b -- a&b | |
| 0x0D | OR | a b -- a\ | |
| 0x0E | XOR | a b -- a^b | |
| 0x0F | NOT | a -- ~a | |
| 0x10 | SHR | a -- a>>1 | Unimplemented |
| 0x11 | SHL | a -- a<<1 | Unimplemented |
| 0x12 | LOAD | a -- M[a] | |
| 0x13 | STOR | a b -- | M[b]=a |
| 0x14 | TOR | a -- | ( -- a ) |
| 0x15 | RTO | -- a | ( a -- ) |
| 0x16 | JUMP | a -- | PC=a |
| 0x17 | JZ | a b -- | PC=b if a==0 |
| 0x18 | CALL | a -- | ( -- PC), PC=a |
| 0x19 | RET | ( a -- ), PC=a | |
| 0x1F | HALT | Stops the machine |