Just as a follow up, I tried the TMR0 Interrupt Handler Code out last night
on a 16F84 and guess what?  It worked fine.

In the interrupt handler, I simply output a "0" on a bit to light an LED.

So, If you have a mid-range part and need a second interrupt pin or can't
use RB0, here you go.

Douglas J.A.R.Sasse asked:

>First Myke, Where or What is the ISB Number for the PIC Programming book?

Hardcopy: 0-07-913645-1
Softcopy: 0-07-913646-X

>also where Might i do a search (Hardware) for a GRiD Compass 1109 computer
>(laptop) this has NO Floppy drive port's and uses Bubble Memmory for hard
>drive's A-I and has a GPIB and a 19 pin Serial [ ******  ]
<SNIP>

No idea - maybe posting a request on one of the sci.electronics newsgroups
would give you some pointers.  An Alta-Vista search might yield something as
well.

Good Luck!

myke

"Programming and Customizing the PIC Microcontroller" is the January 1998
Electronics Book Club Main Selection.  See "http://www.myke.com".