org 100h    ; program load point under CP/M
    ;
    ; the assembler itself will negate an
    ; 8 or 16-bit constant for us
    ;
mvi a,-43   ; a = D5
lxi h,-43   ; hl = FFD5
    ;
    ; no built-in opcode to negate an 8-bit
    ; register, but nevertheless easily done
    ;
mvi a,43    ; a = 2B
cma
inr a       ; a = D5
    ;
    ; the same approach for 16-bit values
    ;
lxi h,43    ; hl = 002B
mov a,l
cma
mov l,a
mov a,h
cma
mov h,a
inx h       ; hl = FFD5
    ;
jmp 0       ; exit to CP/M
end