IBM 5150 - Part 3 скачать в хорошем качестве

IBM 5150 - Part 3

This is Part 3 of my series restoring / reviving an IBM 5150 PC. In this part I inspect and clean the 5 1/4" floppy drives. Update: At the end of this video I spend a good bit of time describing drive select and termination for using two drives on the 5150. And... I got it wrong. What I describe is setting the drive select for both drives to DS0 and putting the termination resistors on drive B:. This would work, but I believe the correct approach is to set both drive selects to DS1, putting the termination on drive A:, and running the ribbon cable to drive B: first, and then wrapping it around to drive A: second. This makes drive A: the last drive on the ribbon cable. Since it is after the twist, drive A: becomes DS0. Since it is also the last drive on the ribbon cable, the chain of drives is correctly terminated. NOW it makes sense. :)