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MICROPROCESSOR INSTRUCTION REFERENCE->SBB

SBB s    Subtract operand s from Accumulator with Borrow

A <- A - s - C

Flags
    
SSet if result -ve, else cleared
ZSet if result zero, else cleared
ACSet if half carry, else cleared
PSet if parity even else cleared
CSet if borrow, else cleared


s:No of bytesCycles
80858080A
r144
M177


register r may be one of A,B,C,D,E,H,L
M is memory addressed by the HL register pair