>> I "cut my teeth" writing 6502 assembler on an Atari.
>
>Yikes, there's a stroll down Olde Phart Lane. That was the first box I ever personally owned. Wrote assembler on it, even had the COBOL compiler. And I spent the big bucks to get 128K of RAM. We're talking serious horsepower. :-)

What Assembler cartridge? I had the original, then stepped up to the OSS Mac65. I think I still have some old assembler code around here...

.MACRO @GPIO
  .IF %0 < 1 .OR %0 > 3
    .ERROR "@GPIO - Bad parameter list"
  .ELSE
    .IF %0 = 1
       JSR XCLOSE
    .ELSE
       LDA # > %2
       LDY # < %2
       JSR %3
     .ENDIF
   .ENDIF
.ENDM

128K?? Wow! You spent some bucks there. I thought I was on top of the world when I got my 800XL with 64K.< bg >

PS - I had to reformat the above to get the parser to take it.:-)