@vanja okay perfect, each instruction is 1 byte long. I recommend that you pick a uxntal disassembler(Dexe, beetbug, etc..) and disassemble simple programs to see how they map to bytecode.

But generally, there's a couple of immediate opcodes(LIT, JMI, JCI, JSI) where their value is found after the opcode, and the rest is all postfix.