Apple I Programming
Here are a few simple tips and programs for those interested in programming the Apple I:
To print to screen:
The above snippet relies on the Echo subroutine in the Apple I's ROM. All you need to do is load an ASCII value into the accumulator, then call that subroutine.
To read a character:
This subroutine loops until a key is pressed, then loads its ASCII value into the accumulator. It is not dependant upon the Apple I's ROM. KbdRdy and Kbd are in the 6821.
Subroutine: GetChar.asm.
Comments
Re: Apple I Programming
Tom,
I could not get your link to the disassembler (dcc6502) to work.
Have a Merry Christmas.
Re: Apple I Programming
Looks like dcc6502's site is gone. I tracked down a copy of the program and and uploaded it. The link now goes to its download page.