ard at p850ug1.demon.co.uk
Mon Jan 5 13:04:14 CST 2009
> Trying to ID some chips I pulled from various pieces of equipment.
> I have a cpu? I pulled out of a modem ... Signetics
> SC80C31BCPN40. This would appear to be an Intel 8031 based
> cpu. But does it have an internal ROM/etc that would preclude
> its reuse ?
The 8031 is ROMless as far as I know. But traditional 8051s (40 pin DIL
package of whatecer) can be used -- the internal ROM can be disabled by
asserting EA (External address), in which case they behave like 8031s. I
am told that some 8031/2s are actually 8051/2s that have been programmed
for some application (in the case of the 8052, often tiny BASIC), and the
ROM has failed the text.
> Searching google for chip part numbers is paramount to useless
> due to all the chip vendors advertising.... there has to be a better
I have found digchip (http://www.digchip.com/) to be quite useful. You
have to register, but I think it's free.
More information about the cctalk