NAME	CHK -- Check bounds
SYNOPSIS	CHK <ea>,Dn Size = (Word) Size = (Word, Long) (68020+)
FUNCTION	Compares the value in the data register specified to zero and to the upper bound. 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, vector number 6, occurs.
FORMAT	15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 1 0 0 REGISTER SIZE 0 MODE REGISTER   <ea>
REGISTER	<ea> specifies upper bound, addressing modes allowed are: Addressing Mode Mode Register Dn 000 No reg. Dn An - - (An) 010 No reg. An (An)+ 011 No reg. An -(An) 100 No reg. An (d16,An) 101 No reg. An (d8,An,Xi) 110 No reg. An (bd,An,Xi) 110 No reg. An ([bd,An,Xi]od) 110 No reg. An ([bd,An],Xi,od) 110 No reg. An Addressing Mode Mode Register Abs.W 111 000 Abs.L 111 001 (d16,PC) 111 010 (d8,PC,Xi) 111 011 (bd,PC,Xi) 111 011 ([bd,PC,Xi],od) 111 011 ([bd,PC],Xi,od) 111 011 #data 111 100
SIZE	11 -> one Word operation 10 -> one Long operation
RESULT	X - Not affected N - Set if Dn < 0; cleared if Dn > <ea>. Undefined otherwise. Z - Undefined. V - Undefined. C - Undefined.

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