Otherwise, your 24 bit scanner image will appear very grainy, speckled and mottled at only 256 colors. It's not the scanner image at all, it's probably fantastic, it's just that you can't see it due to the very limited way a 256 color video board must show a 16.7 million color image. Part 11 page. And even with a wonderful video board, the Win95 default is to set it to only 256 colors. Flatbed scanners so far are typically either SCSI interface or parallel port interface.
Film scanners are typically SCSI interface.
As to installation of a SCSI card, it's really like anything else, no harder, no easier. I'd compare it as very similar to installing an internal modem, except more software comes with the scanner. The Mac folks have it made, SCSI is built in by default. Here is how to use the Win95 Device Manager to check your computer for the availability of the necessary free IRQ for a SCSI scanner, so you will know ahead of time if there will be a problem. In the Win95 Device Manager, highlight the TOP line Computer .