chip identification

[dwight elvey]

----------------------------------------
> From: gordon at gjcp.net
>
> On Sun, 2009-01-04 at 18:58 -0500, Curtis H. Wilbar Jr. wrote:
>> 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 ?
>
> I'm pretty sure the 80C31 is ROMless. Was there a ROM on the board too?
>
---snip---
 
Hi
 The 8031 was the ROM-less version. I always suspected that these
were actually 8051s with defective ROMs. One can use a 8051
in a 8031 socket. It just ignores the ROM in the 8051.
 So, both can be used with an external ROM as though it were
a 8031. It is just one of the pins is tied high or low.
Dwight
 
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