gbdev/rgbds
1
0
Fork 0
mirror of https://github.com/gbdev/rgbds.git synced 2025-11-20 18:22:07 +00:00
Code Issues Packages Projects Releases Wiki Activity

Initial revision: imported RGBDS source code

Browse Source 
The code comes from the RGBDS source and documentation zip files found
on this website:

http://www.otakunozoku.com/1999/08/01/rednex-gameboy-development-system/

The same website reports:

	"Best of all, it’s free! That’s right! Free! The executables
	are free to use, either for personal hobby use, or full blown
	commercial productions — I know of at least a dozen commercial
	games you can purchase that are written with RGBDS — and the
	source code is free to modify.

	"The only thing I ask is that you do not charge for either
	distributing the executables or source code, and any derivative
	works you give credit to the original authors of the tools.
	That means you have to say “Thanks” to the original authors
	SurfSmurf and Otaku."

Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
This commit is contained in:
Carsten Sorensen
2009-06-11 06:00:24 +02:00
committed by Vegard Nossum
commit e895832b2b
103 changed files with 13891 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

100
doc/ASM/TRG_GB.HTM Normal file
View File

@@ -0,0 +1,100 @@
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<TITLE>xAsm Gameboy</TITLE>
</HEAD>
<BODY BGCOLOR="#692764" TEXT="#F5A0D8" LINK="#8AAEE6" VLINK="#2B9DA4" ALINK="#95F0DA">
<I><H2>Gameboy
</H2></I>
<HR>
<P>The full GB-Z80 instruction-set is implemented with a few modifications to the original Zilog syntax. This is due
to a Bison problem but in my opinion the syntax is better than the original one.<BR>
<H4><BR>
Instructions</H4>
<PRE> ADC
ADD
AND
BIT
CALL
CCF
CP
CPL
DAA
DEC
DI
EI
EX
HALT
INC
JP
JR
LD
LDD
LDI
LDH/LDIO (see note below)
NOP
OR
POP
PUSH
RES
RET
RETI
RL
RLA
RLC
RLCA
RR
RRA
RRC
RRCA
RST
SBC
SCF
SET
SLA
SRA
SRL
STOP
SUB
SWAP
XOR</PRE>
<P>Note that you can use both
<PRE> OR A,B
OR B</PRE>
<H4><BR>Addressingmodes</H4>
<P>Indirect addressing has been changed to [ ] instead of ( ):<BR>
<PRE> A
B
C
D
E
H
L
AF
BC
DE
HL
SP
[BC]
[DE]
[HL]
[HL-]/[HLI]
[HL+]/[HLD]
[SP]
n8 (8 bit expression)
n16 (16 bit expression)
n3 (3 bit CONSTANT expression)
[n16]/[$FF00+n8]
[$FF00+C]/[C]</PRE>
<P>The assembler will intelligently decide between <B>[n16]</B> and <B>[$FF00+n8]</B> in the LD instruction. Note however that if you use any <A HREF="symbols.htm">constant symbols</A> in the expression they had better be defined before the instruction or your symbol-table may become mangled. Also worth noting is that it will only ever select the short $FF00 mode when you use constant symbols. NOT if you use symbols defined in a <A HREF="section.htm">HRAM section</A>. As this defies the whole point of implementing the HRAM sectiontype I've added the LDIO mnemonic. It works like the LD instruction but it will ALWAYS generate the $FF00+ form and it will also automatically logically AND the expression with $FF if it is relocatable. Which is what you want. Trust me ;)<BR>
<BR>
<H4>Conditioncodes</H4>
<PRE> C
NC
Z
NZ</PRE>
<BR><HR>
<FONT SIZE="-1"><I><P ALIGN=RIGHT>Last updated 20 July 1997 by <A HREF="mailto:surfsmurf@matilde.demon.co.uk">Carsten Sorensen</A></P></I></FONT>