Re: Apple II weather display

[BLuRry <brendan.robert@gmail.com>]

On Apr 20, 7:12 pm, Osgeld <osg...@cheesefactory.us> wrote:
> I dont even know where to begin with ASM, any good references for the
> total noob? especially for the apple but generic would function as well

Everything you ever wanted to know about 6502 assembler:
http://6502.org/

Just a few basic rules to help frame things for you:
The CPU has only three registers that can hold values: A[ccumulator],
X and Y.  Most of the operations you can perform will be in the
accumulator.  The 6502 also has opcode variants to speed things up for
memory locations in the first 256 bytes of ram, called the "Zero
Page".  So you could use memory locations in the zero page (sometimes
affectionately abbreviated ZP) for additional variable storage, just
try not to clobber anything in use by [Pro]DOS if you're trying to
peacefully co-exist with a resident OS.

There's lots of great articles in Nibble magazines (that's where I
learned):
http://www.nibblemagazine.net/

And to code assembler you'll need... well... an assembler of course!
6502.org has an exhaustive list (though quite dated) here:
http://www.6502.org/tools/asm/
My favorite has been Acme for some time: http://www.esw-heim.tu-clausthal.de/~marco/smorbrod/acme/
Though if you want to be totally hard-core old school then you could
use an assembler on the machine directly like Merlin or ORCA/M.
Personally I find it easier to cross-assemble and send programs over
to an emulator for testing.  Then send via serial for final testing on
real hardware later.

I suppose this topic should be a new subject line.  Oh well, such is
life.  This message board is dripping with 6502 coding veterans (and
junkies alike).  Just ask and we'll help!

-B