Instruction Reference Manual 23
Description
This is an instruction prefix. Causes the instruction immediately following to affect the alternate flags, or use
the alternate registers for the destination of the data, or both. For some instructions ALTD causes special
alternate register uses, unique to that instruction.
Example
The instruction
ALTD ADD HL,DE
would add the data in DE to the data in HL and store the result in the alternate register HL'.
The instructions
ALTD LD DE,BC
and
LD DE',BC
both load the data in BC into the alternate register DE'.
ALTD
Opcode Instruction Clocks Operation
76 ALTD 2 [Sets alternate register
destination for following
instruction.]
Flags ALTD I/O
S Z L/V C F R SP S D
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