On Wed, 26 Jan 2005 10:47:31 -0500, list(a)saracom.com <list(a)saracom.com> wrote: Ow! If the VT320 is like its predecessors (VT220...), it uses 9636 and 9637 chips, *not* 1488s and 1489s. I do not recall off the top of my head which one is Tx and which one is Rx, but if you get the pinouts for the chips, it should only take a couple of minutes to determine which is which by using a continuity tester/VOM to trace out the input pin from the interface jack. Both the 9636 and 9637 are 8 pin DIPs, so it wouldn't even take that long *without* a chip pinout. You just need to know which is the RxD input from the outside world... the chip that's attached to that would be the fried one. Also... you might be able to spot a pinhole or other mechanical damage...

MC1488 or 1489, I don't recall which one's the receiver (I think it's the 1488). Usually mounted fairly close to the RS232 port. Happy hunting. *********** REPLY SEPARATOR *********** On 26-Jan-05 at 10:47 list(a)saracom.com wrote: -=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Owner & Head Hardware Heavy, Blue Feather Technologies -- http://www.bluefeathertech.com kyrrin (at) bluefeathertech do/t c=o=m "If Salvador Dali had owned a computer, would it have been equipped with surreal ports?"