Hello,
i just installed some old wifi card into my RB411U.
It seems that the card gets recognized
[admin@MikroTik] > system resource pci print
# DEVICE VENDOR NAME IRQ
0 00:12.0 Intersil Corporation ISL3890 [Prism GT/Prism Duette]/... 48
but no wlan inteface is visible…
[admin@MikroTik] > interface print
Flags: D - dynamic, X - disabled, R - running, S - slave
# NAME TYPE ACTUAL-MTU L2MTU MAX-L2MTU
0 R ether1 ether 1500 1526
1 X ppp-out1 ppp-out
2 R vlan1 vlan 1500 1522
[admin@MikroTik] > interface wireless print
Flags: X - disabled, R - running