Hi,
I would suspect either MaskROM or factory programmed OTP device.
Try to identify by pinout and then use a programmer to read the chipID and 
work out the exact part number.
Sergei

"matt" <electro_optic@bellsouth.net> wrote in message 
news:AFqse.102973$8S5.17225@bignews3.bellsouth.net...
> Hello Group,
> I am facing the seemingly impossible task to identify a SMD chip marked
> Microchip 85-8024-00 . Microchip obviously has no such part number listed
> nor do I ever recall seeing such part numbering for their products. Custom
> part marking comes to mind.
> However, I googled and found several Far East part brokers which have it ,
> but didn't want to talk with me technical info . Nobody in the USA has any
> idea what this is . I'd appreciate any help.
>
> best regards,
> matt tudor
>
>
> 

Hello Group,
I am facing the seemingly impossible task to identify a SMD chip marked
Microchip 85-8024-00 . Microchip obviously has no such part number listed
nor do I ever recall seeing such part numbering for their products. Custom
part marking comes to mind.
However, I googled and found several Far East part brokers which have it ,
but didn't want to talk with me technical info . Nobody in the USA has any
idea what this is . I'd appreciate any help.

best regards,
matt tudor