MOVEQ - M68K instruction reference

moveqMove quick 
Moves a byte immediate from -128 through 255 into a data register, sign extended to long.
Size .l
Used in trap #15 and its tasksM68K assembly
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XNZVC –●●00
● set from the result
0 always 0
– not changed
Forms  moveq ,   
Operands #imm An 8-bit immediate, -128 to 255, sign-extended to 32 bits, for example #-1 or #$7F. Values 128 to 255 represent -128 to -1. More
Dn A data register, d0 to d7. More
Values 128 through 255 are the unsigned spellings of -128 through -1.
 moveq #100, d0
moveq #-1, d1
moveq #255, d2 ; the encoded byte is $ff, so d2 becomes -1
moveq #-128, d3
; moveq #256, d4 ; error! the encoded value must be -128..255