Nintendo DMG-01 Manual - Page 61

Game Boy command overview

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Game BoyTM CPU Manual 3. Game Boy command overview 3. Game Boy command overview 3.1. Foreword Since books on the Z80 are getting harder & harder to find, hopefully the information here might be helpful to those trying to understand assembly language specific to GameBoy. 3.2. CPU Registers 3.2.1. Generally The GameBoy has instructions & registers similar to the Intel 8080, Intel 8085, & Zilog Z80 microprocessors. It has eight 8-bit registers A,B,C,D,E,F,H,L and two 16bit registers SP & PC: 15..8 7..0 A F B C D E H L SP PC Some instructions, however, allow you to use the registers A,B,C,D,E,H, & L as 16-bit registers by pairing them up in the following manner: AF,BC,DE, & HL. The F register is indirectly accessible by the by DP Page 61

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Game Boy
TM
CPU Manual
3. Game Boy command overview
3.
Game Boy command overview
3.1.
Foreword
Since books on the Z80 are getting harder & harder to
find, hopefully the information here might be helpful
to those trying to understand assembly language
specific to GameBoy.
3.2.
CPU Registers
3.2.1.
Generally
The GameBoy has instructions & registers similar to the
Intel 8080, Intel 8085, & Zilog Z80 microprocessors. It
has eight 8-bit registers A,B,C,D,E,F,H,L and two 16-
bit registers SP & PC:
15..8 7..0
A
F
B
C
D
E
H
L
SP
PC
Some instructions, however, allow you to use the
registers A,B,C,D,E,H, & L as 16-bit registers by
pairing them up in the following manner: AF,BC,DE, &
HL. The F register is indirectly accessible by the
by DP
Page 61