> First problem:  You have code at 0x04 that doesn't belong in the  
> interrupt routine; it looks more like stuff that should be at "start";  

Joe,

Yes. At the bottom of memory are 2 vectors

As absolute addresses you'd have something like

org 0x00 ;reset vector
goto start

org 0x04 ;interrupt vector
goto isr

See Figure 2.1 in the datasheet

Now, you can have the ISR before the main program in memory, after
the main program or within it

For example have the ISR right at the bottom of memory, as some people
prefer. Then you'd have the main code following it, eg

org 0x00

isr code

org 0x100

main code

Similarly the ISR can go after the main code, eg

org 0x00

main code

org 0x1000

isr code

The ISR code can be embedded within the main code

org 0x00
goto start

org 0x04
goto isr

org <program start address>

and isr is a subroutine in the main code that exits with a retfie rather
than a return
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