Please watch, both are also not identical from the applications view and not only from the programming.

The 8051 part without C in the name differs in this way:

- its a NMOS device
- its gulping power and so its heating up
- the output stages are not CMOS-compatible, only TTL compatible
- the high current was about 10 times bigger, if the port pin was driven low externally, e.g. on driving a transistor.
- and some more differences exist


Peter