iGBA beta 8

I thank you for evaluating iGBA!

Disclaimer

GameBoy and GameBoy Advance are registered trademarks of Nintendo.
The author is in no way affiliated with Nintendo.
The author is in no way affiliated with any pirate group out there.
The author cannot and will not provide you with any GameBoy or GameBoy Advance games.
This software is supplied 'as-is' with no warranty, implied or otherwise. Whilst I make every attempt to make the software as free from bugs as possible, this is not guaranteed, and I will not be liable for any loss or damage directly or indirectly incurred through the use of this software.

What is iGBA ?

This program is my Gameboy Advance emulator. For the moment, it can run most of the GBA homebrewn demos.
The official site of iGBA is http://igba.multimania.com.
iGBA is designed mainly for the developers which do not have access to the official development kits of the GBA (like me).

How to Use iGBA ?

iGBA is designed to run on Windows9x/Me/2000 with DirectX 5 (I'm not sure of the DirectX version needed but iGBA does not run with WinNT4.0).

To start iGBA, just click on 'iGBA.exe'. Then you can choose a rom file. You can also associated GBA rom files to iGBA or drop a GBA rom file on 'iGBA.exe' icon.

What is emulated ?

CPU

ARM7TDMI CPU with ARM and THUMB opcode sets is 95% emulated in ARM Mode and 95% in THUMB mode.
CPU timings are not correct.

Memory

CPU Internal working RAM at addresses 0x03000000 (32kB).
CPU External working RAM at addresses 0x02000000 (256kB).
Gamepak ROM at address 0x08000000 mirrored at 0x0A000000 and 0x0C000000.
Gamepak RAM at address 0x0E000000 (64kB).
Cartridge flash ROM is emulated.

Timers

Timer 0	OK
Timer 1	OK
Timer 2	OK
Timer 3	OK

DMA channels

DMA starts at right moment (HBLANK, VBLANK, ...) but are still instantaneous. Repeating DMA are is now emulated.

DMA 0	OK
DMA 1	OK
DMA 2	OK
DMA 3	OK

Joypad

Buttons are OK.
iGBA uses following key equivalents for GBA buttons:

GBA button	PC keyboard
A	SPACE
B	TAB
LEFT	A or Q
RIGHT	Z or W
SELECT	CTRL
START	ENTER
PAD UP	CURSOR UP
PAD DOWN	CURSOR DOWN
PAD LEFT	CURSOR LEFT
PAD RIGHT	CURSOR RIGHT

Images

Feature	Tiled Maps (Mode 0&1)	Roto maps (Mode 1&2)	Mode 3	Mode 4	Mode 5	OAM
Size & Shape	OK	OK	N/A	N/A	N/A	OK
Tile Flipping	OK	N/A	N/A	N/A	N/A	OK
16/256-Colors Tiles	256 Colors OK + some 16 Colors features work	N/A	N/A	N/A	N/A	256 Colors OK + some 16 Colors features work
Position offset (scrolling)	OK	OK	N/A	N/A	N/A	N/A
Mosaic mode	OK	OK	OK	OK	NO	NO
Scale/Rotation	N/A	OK	NO	NO	NO	OK
Windows	OK	OK	N/A	N/A	N/A	NO
Color Effect	All	All	OK	OK	OK	OK

Interrupts

VBlank	OK
HBlank	OK
VCounter	OK
Timers 0,1,2 & 3	OK
Serial	No
DMA 0,1,2 & 3	OK
Key	No
GamePak	No

BIOS

BIOS function 0x0B, 0x0C, 0x12 and 0x15 are supported in THUMB Mode.

Sounds

No sound emulated.