Intel 386 User Manual

D-49
SYSTEM REGISTER QUICK REFERENCE
D.47 POLL (MASTER AND SLAVE)
Poll Status Byte
POLL (master and slave)
(read only)
Expanded Addr:
ISA Addr:
Reset State:
master slave
F020H F0A0H
0020H 00A0H
XXH XXH
7 0
INT — — — — L2 L1 L0
Bit
Number
Bit
Mnemonic
Function
7 INT Interrupt Pending:
0 = No request pending.
1 = Indicates that a device attached to the 82C59A requires servicing.
6–3 — Reserved. These bits are undefined.
2–0 L2:0 Interrupt Request Level:
When bit 7 is set, these bits indicate the highest-priority IR signal that
requires servicing. When bit 7 is clear, i.e., no request is pending, these
bits are indeterminate.

Intel 386 Specifications

General

Architecture	x86
Clock Speed	12 MHz to 40 MHz
Transistor Count	275, 000
Data Bus Width	32-bit
Address Bus Width	32-bit
Instruction Set	x86
Introduced	1985
Maximum Memory	4 GB
Operating Modes	Real mode, Protected mode, Virtual 8086 mode
MMU	Yes
Voltage	5V
Model	Intel 386
Package	PGA
Process	1.5 μm to 1 μm