Z80 CPU registers

Sign
| Zero
| |   Auxiliary Carry
| |   |   Parity/Overflow
| |   |   | Subtract
| |   |   | | Carry
| |   |   | | |  
S Z   AC   P/O N C                 Flags Common
to 8085
  A Accumulator
B C  
D E
H L
         
SP Stack Pointer
PC Program Counter
                                   
S' Z'   AC'   P/O' N' C'                 Alternate Register set New
to Z80
  A'
B' C'
D' E'
H' L'
         
IX Index Register X
IY Index Register Y
  I Interrupt vector Register
R Refresh Row Register