PORTIBM PC Portable (uses same BIOS as XT) 00A0-00AF - PIC 2 - PROGRAMMABLE INTERRUPT CONTROLLER (8259A)
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 0020h-003Fh"PIC 1",INT 70"IRQ8",INT 77"IRQ15"

00A0  RW  PIC 2	 same as 0020 for PIC 1
00A1  RW  PIC 2	 same as 0021 for PIC 1 except for OCW1 (see #P0418)


Bitfields for PIC2 output control word OCW1:
Bit(s)	Description	(Table P0418)
 7	disable IRQ15 (reserved)
 6	disable IRQ14 (fixed disk interrupt)
 5	disable IRQ13 (coprocessor exception interrupt)
 4	disable IRQ12 (mouse interrupt)
 3	disable IRQ11 (reserved)
 2	disable IRQ10 (reserved)
 1	disable IRQ9  (redirect cascade)
 0	disable IRQ8  (real-time clock interrupt)
SeeAlso: #P0014
                                                                                

PORTIBM PC Portable (uses same BIOS as XT) 00A0-00AF - Chips&Technologies 82C100/110 - NMIsee Non-Maskable Interrupt CONTROL
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 0072h"82C100",PORTIBM PC Portable (uses same BIOS as XT) 007Fh"82C100"

00A0  RW  NMIsee Non-Maskable Interrupt mask register (XTIBM PC XT only)
	 bit 7 = 0 NMIsee Non-Maskable Interrupt signal disabled from reaching CPU(Central Processing Unit) The microprocessor which executes programs on your computer.
	       = 1 NMIsee Non-Maskable Interrupt signal enabled
00Ax  RW  mirrors of PORTIBM PC Portable (uses same BIOS as XT) 00A0h