DEC IY

Operation

IY <- IY - 1

Mnemonic

DEC

Operands

IY

b7b6b5b4b3b2b1b0
1 1 0 1 1 1 0 1$DD
0 0 1 0 1 0 1 1$2B

Description

The contents of Index Register IY are decremented.

Condition Bits Affected

None

Example

If Index Register IY contains the integer $2271, then upon the execution of

	DEC	IY

Index Register IY contains $2270.