Matt

Since you are already using a daughter board how much latitude do you have. A processor with the same die or something close like a
MELPS740 or a little further afield like 6808 or father yet a PIC

6502 code can generally be translated to run on a MELPS by re-arranging the opcode map (I believe the instruction set is a super set but is remapped 6502)
6502 to 6808 close but be careful with carries are reversed in subtract chains (including compares)
6502 to PIC would take some work but is possible



w..

Matt Pobursky wrote:

> Hi Bill,
>
> I think this is one part you're going to have a *real hard time
> * finding. How do I know?
>
> I just finished re-designing a product for a client that's been in
> production since 1985. It originally used a Rockwell R6501Q MPU. See
> where this is heading?
>
> The client builds about 1500 of these units a year and for the past
> several years has been building them with a R6501J mounted on a
> carrier board to fit the old R6501Q quad inline holes. This assembly
> is a life-safety type device and changing the PCB layout would
> require a complete U.L. re-listing to the tune of about $80K. So we
> needed something that would "drop-in" and not require any software or
> PCB re-work. We were lucky to find the R6501J's and be able to adapt
> them to the old PCB design.
>
> The contract manufacturer notified my client around the first of this
> year that they could no longer find *any* of the parts anywhere in
> the world at any price. They bought the last 500 pcs. they could find
> for something like $65 ea. I tend to believe them as they've been on
> a constant search for these parts for several years. They are
> currently manufacturing the last 150 units they have parts for this
> month and we'll be putting the new unit into production in January,
> 2007.
>
> Good luck in your search, but I think you'll find that part very
> hard, if not impossible, to find.
>
> Matt Pobursky
> Maximum Performance Systems
>
> On Wed, 22 Nov 2006 11:51:41 -0500, William Couture wrote:
> > Hi!
> >
> > I was wondering if anyone could point me to a source for some
> > obsolete chips -- R6501J in 68 pin PLCC packaging?  The complete
> > partnumber is R6501J R1702-13 PLCC68
> >
> > We already have a quote from 1stcallelectronics.com, but would like
> > to find additional sources if possible.
> >
> > Thanks,
> > Bill
> >
> > --
> > Psst...  Hey, you... Buddy...  Want a kitten?
> > straycatblues.petfinder.org
>
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