Problems with 10Mbit ethernet connections on Adaptec Starfire card

If I connect an Adaptec Starfire card to a 10Mbit, half duplex ethernet, it sees very few (though not 0) packets. Debug logging shows that it's correctly recognising the connection as 10Mbit, half duplex. The port is unusable like this (despite the odd packet or two).

If I connect a 100Mbit back-to-back with another adaptec, or connect myself to the same 10Mbit port as before through a 100Mbit switch (giving me a 100Mbit local connection) it works fine. A tulip board to the same port (direct @ 10Mbit) also works fine.

Anyone else seen anything like this? Couldn't see anything in the archives.

Thanks,

Martin.

PS. Linux 2.4.6 kernel.