SCPL 4.1 vm instructions:

opcode  tier    name    description

0x00 ADD    adds values on datastack together
0x01 SUB    subs values on datastack
0x02 MUL    multiplies values on datastack
0x03 DIV    divides values on datastack

0x04 load   loads operand onto datastack
0x05 save   saves top of datastack into operand

0x06 goout  goes out of current object
0x07 goin   goes into top of datastack

0x08 pop    pops top of datastack

0x09 1 call   calls a function. top of datastack specifies amount of arguments, object under that is target function, arguments amount of objects under that are passed as arguments
0x0A 3 callif executes operand if top of datastack is 1.

0x0B equal  checks if the 2 top objects on datastack are equal, if yes, push 1 on datastack
0x0C great  checks if top object on datastack is greater than object under that, if yes, push 1 on datastack

0x0D AND    And's the 2 top datastack objects together and pushes output onto datastack
0x0E NOT    Inverts value on datastack and pushes result onto datastack

0x0F rem    stores value on datastack onto secondary stack
0x10 recall loads value from secondary stack onto datastack

0x11 4 while  executes operand while top of datastack is 1.

0x12 2 try    executes operand and pushes an ATTEMPT_RES object onto datastack

0x13 ret    exits out of code which has the same or greater tier than specified

operand specification:

operand handler must return pointer
operand handler must be registered to work
handler must register with an op_handler class.