IBM SY31-0458-3 Section 08 33FD 53FD Diskette Level 1 free download

File name SY31-0458-3_Section_08_33FD_53FD_Diskette_Level_1.pdf

Contents 33FD/53FD DISKETTE DRIVE AND ERROR CONDITIONS 8-50 ATTACHMENT (Level 1) 8-1 Fast Check . . . . . 8-52 INTRODUCTION 8-1 Not Ready . . . . . 8-52 Diskette Addressing . . 8-1 Missing Erase Current and Unexpected or 33FD Diskette Drive . . . 8-2 Erase Current Present . . . . 8-53 33FD Diskette Drive Assembly 8-2 ID Not Found (Missing Record) 8-53 33FD Operating Sequences 8-3 Read Overrun Check . 8-54 Frequency Modulation Read and Write Circuits 8-4 Write Overrun Check . 5-54 Diskette 1 Format. . . . . . 8-5 Write Parity Check. . 8-54 53FD Diskette Drive . . . . . . 8-6 53FD Diskette Drive Assembly 8-6. 53FD Operating Sequences 8~ 7 Modified Frequency Modulation Read and Write Circuits ... 8-8 Diskette 20 Format 8-9 DATA FLOW . . 8-11 OPERATIONS. . 8-12 Seek Operations . 8-12 Seek Data Flow 8-13 Read Operation 8-14 Read Data Flow 8-17 Write Operation 8-18 Write Data Flow . 8-19 Find Sector Identification Operation 8-20 Find Sector Identification Data Flow 8-23 Write Sector Identification Operation. 8-24 Write Sector Identification Data Flow 8-25 COMMANDS . . . . .. 8-26 I/O Load Command . . . . 8-26 I/O Sense Command 8-28 I/O Control load Command 8-30 Write Byte or Write Address Mark Byte Command . . . . . . . . . . . . . 8-32 Write Data Trigger . . . . . . . . 8-34 Write Cyclic Redundancy Character Byte Command . . . . . . . . . . . . . 8-35 Seek to Next Track Command 8-37 Search for Address Mark Byte Command. 8-38 I/O Control Sense Command . . . . . . 8-40 Sense Interrupt Level Status Byte Command 8-43 Jump on I/O Command 8-44 FUNCTIONAL UNITS 8-46 Data Separator 8-46 I ndex Counter . . . . 8-46 Ready Counter 8-47 Control Storage Initial Program Load Track Counter . . . . . . . . . .