Very Computer

Hi,
I'm having problems getting an EtherExpressIII 3c589c PCMCIA network
adapter to work on an AJP P150 laptop, running RH6.0.  The cardmgr
appears to identify/configure the card OK, but pinging any host (either
10base2 or 10baseT) is unreliable, dropping packets and returning errors
e.g. byte n received as 0x0c but expected 0x0e.  I have tried different
IRQ and base address combinations (0x300, 0x210 and IRQ's 3, 9, 10
altered by editing /etc/pcmcia/config.conf) but it's still wrong.
Telnet is also very slow.
Initially I configured the adapter with linuxconf, but after reading
HOWTO-PCMCIA, created (as it wasn't there) a /etc/pcmcia/network.conf as
it described. This too made no difference.  The adapter when inserted
and removed, beeps correctly, the link light shows expected flashes and
no errors are reported in /var/log/messages (shows the auto-detection
also works OK)
It's made more frustrating by the fact that the HOWTO actually refers to
this 3comm card as an example.
Can anyone help please, Thanks,
--
Marvin