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MBC3 RTC save format | |
the RTC data is appended after the sav file, 44 or 48 bytes. you can detect its presence by the save data being 44 or 48 bytes bigger than the cart's ram size, or 44 or 48 bytes bigger than a multiple of 8192. | |
old VBA (from 2005) saves the 44 bytes version, and can load both the 44 and 48 bytes version. | |
VBA-M saves the 48 bytes version, and can *only* load the 48 bytes version. | |
one should load both types, and always save the 48 bytes version. |
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Memory Bank Controller (MBC) 3 for GameBoy Information | |
by bRILLO hEAD, 1-Jan-98 | |
The MBC3 is a memory controller for some GameBoy carts |
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Nitty Gritty Gameboy Cycle Timing | |
--------------------------------- | |
A document about the down and dirty timing of the Gameboy's video hardware. | |
Written by: Kevin Horton | |
Version: 0.01 (preliminary) | |
My findings here are based on the original DMG, Super Gameboy, and GB |
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Interrupt INT 48h - LCD STAT | |
---------------------------- | |
The STAT register (FF41) selects the conditions that will generate this | |
interrupt (expecting that interrupts are enabled via EI or RETI and that | |
IE.1 (FFFF.1) is set). | |
STAT.3 HBLANK (start of mode 0) | |
STAT.4 VBLANK (start of mode 1) (additional to INT 40) | |
STAT.5 OAM (start of mode 2 and mode 1) |
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GameBoy Color DMA-Transfers v0.0.1 13.04.2000/GPZ-HIT | |
------------------------------------------------------------------------------- | |
"old" DMA Transfer (aka 'OAM-DMA') | |
---------------------------------- | |
source: - anywhere from $0000 to $dfff | |
- must be page-aligned | |
destination: - always OAM-Ram at $fe00 - $fe8f | |
length: - always 4*40 (=160 / $a0) bytes |
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THE ISA AND PC/104 BUS | |
IBM, IBM/XT, IBM PC, and IBM PC AT are registered trademarks of | |
International Business Machines Corporation. | |
This file is designed to give a basic overview of the bus found in | |
most IBM clone computers, often referred to as the XT or AT bus. The | |
AT version of the bus is upwardly compatible, which means that cards |
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1.01 - Added some new licensees, fixed some | |
descriptions. | |
v1.00 - Initial release. | |
_______________ | |
This information was taken and compiled from Martin Korth's | |
NO$GMB emulator. Best viewed in DOS EDIT. | |
Every Gameboy ROM header starts off at the HEX offset 0134. |
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Game Boy Sound Operation | |
------------------------ | |
Shay Green (blargg) | |
gblargg@gmail.com | |
http://www.slack.net/~ant/ | |
** This is an incomplete draft | |
This documents the behavior of Game Boy sound; details which aren't | |
relevant to the observable behavior have been omitted unless they |
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LD SP,$fffe ; $0000 Setup Stack | |
XOR A ; $0003 Zero the memory from $8000-$9FFF (VRAM) | |
LD HL,$9fff ; $0004 | |
Addr_0007: | |
LD (HL-),A ; $0007 | |
BIT 7,H ; $0008 | |
JR NZ, Addr_0007 ; $000a | |
LD HL,$ff26 ; $000c Setup Audio |
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; GameBoy Color Boot ROM Disassembly | |
; Dumped by Costis | |
; Commenting by Randy Mongenel (Duo) | |
; WORK-IN-PROGRESS VERSION 09-27-2009 | |
; =========================================================================== | |
; Segment type: Pure code | |
SECTION "ROM", CODE |
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