6502 Tips, Tricks and Links

[TBCTBC]

Thought I would make a thread with some useful information for programming the 6502.

Links

http://6502.org/tutorials/6502opcodes.html
I find this page pretty useful when I need to look up something.

http://www.emulator101.com/6502-addressing-modes/
This page explains the addressing modes in a nice way.
I found this when I needed to understand how indexed indirect works.
I use indirect indexed pretty often, but never indexed indirect.

http://www.ataripreservation.org/websit ... lopc31.txt
A little text describing the illegal opcodes of the 6502. Maybe you shouldn't be using them, but it's fun
I'm not sure how accurate this is or if there's a better page out there.

Does anyone else got any nice links?

[MADrigal]

This is extremely useful information for people like me, trying to learn the 6502 programming.

Much appreciated

[Mobsie]

I give a lot people this link:

http://www.6502asm.com

Is a complete Online Emulator with a lot samples.

[MADrigal]

I give a lot people this link:

http://www.6502asm.com

Is a complete Online Emulator with a lot samples.

Wow it's gorgeous!!

[carlsson]

I needed to understand how indexed indirect works.

Have you ever found a use for that addressing mode, some kind of jump table in zeropage?

The irony is that indirect indexed mode ($nn),y is a staple, something you use very often for dynamic programming and perhaps even more so when dealing with mostly ROM oriented software, while indexed indirect mode ($nn,x) is something I still really haven't found a reason to use.

[Mobsie]

Yes i also use only indirect indexed mode.

For example in my tile-map engine i use tables with the direct screen address to send to the VDP reg.
And for all kinds of calculation or shifting.

[TBCTBC]

I needed to understand how indexed indirect works.

Have you ever found a use for that addressing mode, some kind of jump table in zeropage?

Nope, it's almost useless I thought I could use it for something, but it turned out I didn't need it.