JSI Tip 2018. Error when booting the NT 4.0 or Windows 2000 CD with an Adaptec 2490UW?

If your Adaptec 2940 BIOS is setup to allow booting a CD-ROM, you may experience:

BIOS 1.22

CD-ROM became Drive C: ,Hard Drive became Drive D: 

Error: "MISSING OPERATING SYSTEM"

CD-ROM does not become DRIVE C: 

Error: "BOOT: Memory overflow error Please insert another disk."