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
way....
I have found digchip (
http://www.digchip.com/) to be quite useful. You
have to register, but I think it's free.
-tony