IBM SY31-0458-3 Section 14 Diskette Level 2 free download

File name SY31-0458-3_Section_14_Diskette_Level_2.pdf

Contents 33FD/53FD/72MD DISKETTE DRIVE I/O Sense Command-I/O Control AND ATTACHMENT (LEVEL 2) . . 14-1 Sense Command . . . . . . . . 14-32 INTRODUCTION . . . . . . . 14-1 Jump on I/O Condition Command. 14-34 33FD Diskette Drive . . . . . . 14-2 Sense Interrupt Level Status Byte 33FD Diskette Drive Assembly 14-2 Command . . . . . 14-36 33FD Operating Sequence . . 14-3 FUNCTIONAL UNITS 14-37 53FD Diskette Drive . . . . . . 14-4 Data Separator 14-37 53FD Diskette Drive Assembly 14-4 Index Counter . . . . 14-37 53FD Operating Sequence . 14-5 Ready Counter 14-38 72M D Diskette Magazine Drive 14-6 Control Storage Initial Program Load Autoloader Units . . . . . 14-6 Track Counter . . . . . . 14-38 Diskette Drive Components 14-7 CSIPL Autoloader Sequence 14-38 Logic Cards . . . . . . . 14-7 Read/Write Clock . . . 14-39 Stepper Motors . . . . . . 14-8 Write Trigger . . . . . 14-40 72M 0 Operating Sequences 14-10 Address Mark Detection 14-42 Frequency Modulation Read and Write Circuits 14-12 Bit Ring . . . . . . . 14-42 Modified Frequency Modulation Read and Cyclic Redundancy Character Shift Register . 14-43 Write Circuits . . 14-13 ID Buffer . . . . . . . 14-44 Diskette 1 Format. 14-14 Data Buffer . . . . . . 14-45 Diskette 20 Format 14-15 Sector Sequence Control 14-45 DATA FLOW . . . . 14-16 Track Sequence Control 14-45 OPERATIONS . . . . 14-17 Byte Counter . . . . . 14-46 Diskette Drive Operations . 14-17 Cycle Steal Control 14-46 Seek Operation . 14-17 Interrupt Level 4 Request. 14-47 Read Operation . . . 14-19 DBI Assembler 14-47 Write Operation . . . 14-21 CBI Assembler 14.-47 Write Verify Operation 14-22 Op Decode . . 14-47 Find Sector Identific