Digibarn Collection ➔ Ohio Scientific Disk Drive
Physical Object
2021.11.03.54.db
Original OSI motherboard designs used 7400-series TTL chips. Instead of using a floppy disk controller IC, OSI used a Motorola MC6850 ACIA Serial Port ACIA chip and a Motorola MC6821 (PIA) chip for the Disk Drive Controller, which made OSI 8" & 5-1/4" Floppy Disks unreadable by other computer systems.