Most (all?) Macs from that era used SCSI drives. I believe that they also used SCSI peripherals like scanners. The inclusion of the SCSI port is probably so you can connect those.
Something is off with the image in the ad, because it says that every OrangePC comes with 2 serial ports, parallel, game, and sound blaster input, which is not what the picture shows. I would expect something like this:
What is the use for the SCSI port?
Most (all?) Macs from that era used SCSI drives. I believe that they also used SCSI peripherals like scanners. The inclusion of the SCSI port is probably so you can connect those.
Something is off with the image in the ad, because it says that every OrangePC comes with 2 serial ports, parallel, game, and sound blaster input, which is not what the picture shows. I would expect something like this:
https://i.ebayimg.com/images/g/ZZYAAOSwjwFlyTE2/s-l960.jpg