You can force "Adaptec AIC-7870 PCI SCSI Controller (emulated)" which is
compatible with 2940

in device manager, select the SCSI adapter, click "Update driver",
"Browse my computer for driver software", "let me pick from a list of
device drivers on my computer", uncheck "show compatible hardware", and
select "Adaptec" as Manufacturer and "Adaptec AIC-7870 PCI SCSI
Controller (emulated)"


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gvollant