If Dn < 0 or Dn > Source then TRAP

Assembler Syntax:
CHK <ea>, Dn

Attributes: Size = (Word, Long)

Description: Compares the value in the data register specified
in the instruction to zero and to the upper bound (effective
address operand). The upper bound is a twos complement
integer. If the register value is less than zero or greater
than the upper bound, a CHK instruction exception, vector
number 6, occurs.

Condition Codes:

X Not affected.
N Set if Dn < 0; cleared if Dn > effective address operand.
Undefined otherwise.
Z Undefined.
V Undefined.
C Undefined.

Instruction Format: