F Features 1-1 Fill Memory 6-8 Floppy Disk 1-1,4-4,5-24 Floppy Disk Control Port Address Offsets 5-25 Floppy Disk Controller 4-1,5-24 Floppy Disk Controller Port Address Offsets 5-25 Floppy Controller (765) Test 6-23 Floppy Disk Drive P7 Connector Pin Out B-9 Floppy I/O 6-8 Formatting Guidelines 5-39 Fully Nested Mode 5-l~ Gap 1 5-39 Gap 2 5-39 Gap 3 5-39 Go 6-8 G H Hard Hard Hard Hard Hard Hard Head Help Disk 1-1,4-l,5-l,B-5 Disk Controller 4-4,5-36 Disk Controller Board Circuitry Disk Drive PI Connector Pin Out Disk Drive P2 Connector Pin Out Disk I/O 6-9 Selection 5-36 6-8 5-37 B-7 , B-8 B-6 I Initialization of the system 6-1 Input Port 6-8 In-Service Register (ISR) 5-8,5-9 Intel 8~186 Microprocessor 1-1,2-3,3-1,3-3,4-1,5-3,5-27 Internal CPU's Timer Test 6-22 Internal CPU's Interrupt Test 6-22 Internal CPU's DMA test 6-22 Interrupt Control Operation 5-7 Interrupt Controller Register Offsets 5-8 Interrupt Controller (8259) Test 6-21 Interrupt Mask Register (IMR) 5-9,5-l~ Interrupt Request 5-9 Interrupt Request Register (IRR) 5-8,5-9 K Keyboard 1-1,6-2 Kernel 4-3 1-2