I'm writing an emulator for the game boy color (for fun). I've found tonnes of resources and references for the original game boy's hardware, namely Imran Nazar's tutorial (http://imrannazar.com/Ga...

As part of the work I've been doing to answer this question about the technical workings of a glitch in Pokémon Red, I've been looking for a way to use a standard debugger to debug a Game Boy ROM. ...

The Game Boy Z80 CPU has a half-carry flag, and I can't seem to find much information about when to set/clear it. What I understand so far is that any 8-bit add, subtract, shift, or rotate operati...

Like so many others, I am writing a Game Boy emulator and I have a couple of questions regarding the instruction 0xE8 (ADD SP, n with an 8-bit immediate). It is claimed here that in 16-bit instruc...

I've tried to decode the following bitmap using the background pallete scheme described at http://imrannazar.com/GameBoy-Emulation-in-JavaScript:-Graphics CE ED 66 66 CC 0D 00 0B 03 73 00 83 00 ...

Since the Gameboy's processor, the LR35902, is a hybrid of the Z80 and the Intel 8080, keeping in mind that the Z80 and the Intel 8080 were designed to be mostly cross-compatible anyways, could any...

While looking through the Gameboy's instruction set, I came across instructions such as: LD A, A LD B, B LD C, C LD D, D ... Each of these instructions has it's own opcode in this table, which ...

This is not a homework problem, it's for a game I'm developing. I have two 16-bit RGB colors, and would like to vary their six channels according to six other four-bit quantities. The algorithm is...

Hello I'm writing an emulator for Game Boy. I use this reference : Gameboy CPU (LR35902) instruction set This document states that opcodes : 0xE2 LD (C),A and 0xF2 LD A,(C) have a length of...

im am writing a simple emulator in go (should i? or should i go back to c?). anyway, i am fetching the instruction and decoding it. at this point i have a byte like 0x81, and i have to execute the ...

Could someone please explain what the opcode 0x08 does on the LR35902 processor. The mnemonic is LD (a16),SP. I'm confused because the stack pointer is a 16-bit value but (a16) is an address to so...

I have begun programming an emulator for the Gameboy classic, my next project after a successful Chip 8 Emulator. As a reference I use the GameBoy CPU Manual. Now on page 66 it says: LD A,(HL) 7...

On the page 87 of the Game Boy CPU Manual it is claimed that the CP n instruction sets the carry flag when there was no borrow and that it means that A < n. This seems to conflict itself, becaus...

According to Gameboy Programming Manual, HALT mode is canceled by the following events, which have the starting addresses indicated. A LOW signal to the /RESET terminal Starting address: 0x...

I've been working on a Game Boy emulator, and I've noticed that there are certain opcodes that exist that would never change any values, such as LD A, A, LD B, B, etc. and also AND A. The first one...

I was reading a tutorial about creating a Game Boy emulator, I understand that the Game Boy uses an 8-bit CPU, but I can't understand why the Gameboy uses two types of data: bytes (8 bits) and word...

I am making a game for the GameBoy in GBDK, and I'm trying to add sounds to the game. GBDK has a function that plays sounds from an array of values, the only problem is that while its playing the s...

Possible Duplicate: How do emulators work and how are they written? I'd like to try writing a basic gameboy emulator, or maybe even NES. I know the basics of C and I'm fairly good at ...

I'm currently developing an emulator for the good old GameBoy and I'm facing some problems understandig how some basic operation codes have to be implemented. Right now I'm implementing the AND o...

On Gameboy Z80, exactly how does the LD HL,(SP+e) operation affect H and C flags? (Half-carry + carry) Reference: http://www.devrs.com/gb/files/opcodes.html