data sheet for com5025

Chuck Guzis cclist at
Sun Aug 20 20:23:13 CDT 2006

On 8/20/2006 at 11:55 PM ard at wrote:

>However, I have seen a 48 pin 5025 that has much the same pinout as 
>(IIRC) the 7900 -- well, one ethernet chip anyhow. Somewhere I have a 
>communciations bridge that can take 3 I/O cards. On the mainboard you fit 
>an 7990 for positions where you have ethernet cards, and a 5025 for the 
>X21 or X25 cards. I think there's a jumper to set too, but that's it.

Yup, that's essentially what the MK5025 datasheet says:  "Nearly
pin-compatible with the Lance chip (MK7990)".  Which is a curious use of
the term "compatible"--i.e. the signals are almost the same, the chip
functionality is not.

Strange but true.


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