Nintendo GAME BOY Programming Manual page 108

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Game Boy Programming Manual
CY
H
N
Z
CYCL
7 6
5 4 3
2 1 0
ss ← ss - 1
DEC
ss
--
--
--
--
2
00
ss1
011
Decrements the contents of register pair ss by 1.
Example: When DE = 235Fh,
DEC DE ; DE ← 235Eh
108

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