TABLE OF CONTENTS 6. Disk input/output 6-1 6.1 Basic operating principles of disk drives 6-2 6.2 Universal Disk controller 6-6 6.3 Interfacing with non-intelligent 5.25" disk drives 6-8 6.3.1 Moving the read/write head .... 6-9 6.3.2 Reading data from the disk drive 6-13 6.3.3 Writing data to the diskette .... 6-17 6.4 Interfacing with non-intelligent 3.5" disk drives 6-20 6.4.1 Reading dive status 6-22 6.4.2 Sending commands to the disk drive 6-25 6.4.3 Reading disk data 6-27 6.4.4 Writing data to the disk drive 6-29 6.5 Interfacing with intelligent disk drives 6-31 7. Expansion RAM 7-1 7.1 Accessing the expansion RAM 7-1 7.2 Applications of the expansion RAM 7-4 8.
Parallel printer port and serial ports 8-1 8.1 Parallel printer port 8-1 8.2 Serial ports 8-3 IV