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cory21391

Red Cheep-cheep








Since: 04-21-06
From: North Carolina

Last post: 5965 days
Last view: 5965 days
Posted on 08-08-06 07:56 PM Link | Quote
I copied all the info from the ASM thread (Glyph's thread) and I noticed that some of the opcodes are in 3 letter form (ex. LDA) but I'm using a hex editor. As are all the opcodes in the 65816ref.hlp file. I don't like using txt files and compilers. So, is there a list anywhere of all (or most) of the opcodes in hex format and a description (what the opcode IS and what it basically does.) Thanks in advance; trying to learn asm here. BTW, the opcodes that are in hex are only like 3 or 4; so that's not much to work with
Ice Man

Panser



 





Since: 11-18-05
From: Germany

Last post: 6006 days
Last view: 5943 days
Posted on 08-08-06 08:38 PM Link | Quote
If you would read the 65816ref.hlp better, then you would know them.

It explains the opcodes and what they do + they're in hex on the right also.
Here's an example: 

LDA imm8/16	n-----z-	A9 xx xx

LDA dp	        n-----z- 	A5 xx

LDA abs	        n-----z- 	AD xx xx

LDA long	n-----z-	AF xx xx xx

LDA dp, x	n-----z-	B5 xx

LDA abs, x	n-----z-	BD xx xx

LDA abs, y	n-----z-	B9 xx xx

LDA long, x	n-----z-	BF xx xx xx

LDA (dp)	n-----z-	B2 xx

LDA (dp), y	n-----z-	B1 xx

LDA [dp]	n-----z-	A7 xx

LDA [dp], y	n-----z-	B7 xx

LDA (dp, x)	n-----z-	A1 xx

LDA  sr, s	n-----z-	A3 xx

LDA (sr, s), y	n-----z-	B3 xx


These instructions loads a value from the operand to a register. LDA instruction loads to the accumulator; LDX instruction loads to X, LDY instructions loads to Y.

Attachments

65816ref.rar (28952b) - views: 14
Goldensunboy

Snifit








Since: 12-30-05
From: Georgia

Last post: 5912 days
Last view: 5912 days
Posted on 08-08-06 09:16 PM Link | Quote
-LDA imm8/16 Will load the next one or two numbers into the accumulator, depending whether the accumulator is in 8-bit or 16-bit mode. (largest byte last)
-LDA abs will load a number from $7E0000-$7E1FFF RAM. It will load it from a different bank if the direct page number is changed. The address is largest-byte-last.
-LDA long allows you to load a value from anywhere within RAM or ROM, largest byte last.
-I'm not sure about the functions with (dp) in them, but it has something to do with the direct page.
-A ",x" or ",y" is LDA indexed with X or Y. This is used when loading from tables, it adds whatever's on the X or Y register to the said place it's loading from. If it's loading, indexed with X, from $7E0300 (sprite OAM), and 8 is in X, it will load from $7E0308.

Most of the same properties are shared by the STA, STX and STY instruction, too.

(edited by Goldensunboy on 08-08-06 08:17 PM)
cory21391

Red Cheep-cheep








Since: 04-21-06
From: North Carolina

Last post: 5965 days
Last view: 5965 days
Posted on 08-09-06 02:09 PM Link | Quote
Sorry; I must've gotten confused Thanks, though.
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