On Jan 5, 2009, at 12:10 PM, Alexandre Souza wrote:
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 ?
Yep...but even 8051 (which has an internal ROM) can be used as a
romless 8031. There is a pin of internal memory selection you have
to tie down, pin 31 if I'm not mistaken.
Yup, pin 31. Tie it low to enable external program memory.
-Dave
--
Dave McGuire
Port Charlotte, FL