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DEC IY

Decrement IY.
Function: IY <- IY - 1
 
Format:
1111 1101
 
byte 1: FD
 
0010 1011
 
byte 2: 2B
 
Description: The contents of the IY register are decremented and the result is stored back in IY.
 
Data Flow:
 
Timing:
 
Addressing Mode:
 
Flags:
 
(no effect)
 
Example:

OBJECT CODE
Before:
 
After: