6 Feb
2003
6 Feb
'03
11:56 p.m.
What do I need to get started with 6502 Assembly on an
apple II?
--- I have:
6502 Machine code reference
Apple IIc+
Prodos
Dos 3.3
--- Things I know I need to know:
What call prints a character?
JSR $FDED ASCII Print
JSR $FDDA Hex Print
JSR $FDE3 Nibble Print
What call gets input of some kind (preferably 1 key at
a time)
JSR $FD1B Wait for key
JSR $FD35 Peek Key
Any calls to clear the screen?
JSR $FC58
Any calls to position the cursor?
$20-$23 Window size
$24,25 Cursor
And then there was JSR $BF00 to execute Prodos commands ($c0 and up).
Not to forget $B700 for RWTS :) (Yes, I know, official entry point
was $3D9 and GETIOB is $3E3)
After all RTFM !
THe manual did list all of this and more. including the Monitor ROM listing.
--- Things I know I need to get:
Assembler
Editor
Get a copy of BigMac, and go ahead. it's a nice all in one
environment, and works fine on every Apple. Well, Merlin
will do the same.
I don't as yet know how to get things from the web
to my Apple II, I
use a Mac mostly to surf
Use a browser :)
Gruss
H.
--
VCF Europa 4.0 am 03./04. Mai 2003 in Muenchen
http://www.vcfe.org/