Hex Mnemonic Cycles
02 nn ADD A, #nn 8
04 nn ADD A, [N+#nn] 12
05 nn nn ADD A, [#nnnn] 16
CE 00 ss ADD A, [X+#ss] 16
CE 01 ss ADD A, [Y+#ss] 16
CE 02 ADD A, [X+L] 16
CE 03 ADD A, [Y+L] 16
CE 04 ADD [HL], A 16
CE 05 nn ADD [HL], #nn 20
CE 06 ADD [HL], [X] 20
CE 07 ADD [HL], [Y] 20

### Execute

```#nn     = Immediate unsigned 8-Bits
#ss     = Immediate signed 8-Bits
A       = Register A
B       = Register B
[N+#nn] = Memory: (I shl 16) or (N shl 8) or #nn
[HL]    = Memory: (I shl 16) or HL
[X]     = Memory: (XI shl 16) or X
[Y]     = Memory: (YI shl 16) or Y
[#nnnn] = Memory: (I shl 16) or #nnnn
[X+#ss] = Memory: (XI shl 16) or (X + #ss)
[Y+#ss] = Memory: (YI shl 16) or (Y + #ss)
[X+L]   = Memory: (XI shl 16) or (X + signed(L))
[Y+L]   = Memory: (YI shl 16) or (Y + signed(L))
```
```; ADD Ds, Sc
;
; Ds = Destination
; Sc = Source

; (If flags BCD=0 and NIBBLE=0)
Ds = Ds + Sc

;------------------------------------------------

; (If flags BCD=0 and NIBBLE=1)
Ds & 0x0F = (Ds & 0x0F) + (Sc & 0x0F)

;------------------------------------------------

; (If flags BCD=1 and NIBBLE=0)
IF (((Ds & 15) + (Sc & 15)) >= 10) THEN
Ds = Ds + Sc + 6
ELSE
Ds = Ds + Sc
ENDIF
IF (Ds >= 0xA0) Ds = Ds + 0x60

;------------------------------------------------

; (If flags BCD=1 and NIBBLE=1)
IF (((Ds & 15) + (Sc & 15)) >= 10) THEN
Ds & 0x0F = (Ds & 0x0F) + (Sc & 0x0F) + 6
ELSE
Ds & 0x0F = (Ds & 0x0F) + (Sc & 0x0F)
ENDIF
```

### Description

8-Bits Source adds to the 8-Bits Destination.

### Conditions

#### If flags BCD=0 and NIBBLE=0

Zero: Set when result is 0

Carry: Set when result is >= 256

Overflow: Set when result overflow 8-bits signed range (< -128 OR > 127)

Sign: Set when bit 7 of the result is 1

#### If flags BCD=0 and NIBBLE=1

Zero: Set when result is 0

Carry: Set when result is >= 16

Overflow: Set when result overflow 4-bits signed range (< -16 OR > 15)

Sign: Set when bit 3 of the result is 1

#### If flags BCD=1 and NIBBLE=0

Zero: Set when result is 0

Carry: Set when result is >= 100

Overflow: Always Reset

Sign: Always Reset

#### If flags BCD=1 and NIBBLE=1

Zero: Set when result is 0

Carry: Set when result is >= 10

Overflow: Always Reset

Sign: Always Reset

### Examples

```; A = 0x55
; A = 0xD5 (0x55 + 0x80 = 0x(0)D5)
; F = (Zero=0):(Carry=0):(Overflow=1):(Sign=1)
```
```; B = 0x31
; A = 0xCF
; B = 0x31
; A = 0x00 (0xCF + 0x31 = 0x(1)00)
; F = (Zero=1):(Carry=1):(Overflow=0):(Sign=0)
```
```; [HL] = 0xDE
; A = 0xCF
; [HL] = 0xDE
; F = (Zero=0):(Carry=1):(Overflow=0):(Sign=1)
```
```; ( BCD = 1, NIBBLE = 0 )
; A = 0x09
; A = 0x10 (09 + 01 = 10)
; F = (Zero=0):(Carry=0):(Overflow=0):(Sign=0)
```
```; ( BCD = 0, NIBBLE = 1 )
; A = 0x3F (Note, in "nibble mode" the high nibble is always discarded)