TST (16 bit, compare register pair with zero)

The SYS instruction performs a software interrupt and sets the PC to the location specified by the following byte times 8. The handle interrupt flag is set.

Opcode

765432	10
110101	r

Operation

F <- Flags[Reg16[r] - 0]
PC <- PC + 1

Assembler syntax examples

TST	BC
TST	DE