Intel 386 User Manual

Intel386™ EX EMBEDDED MICROPROCESSOR USER’S MANUAL
4-10
Figure 4-5. DOS-Compatible Mode
3FFH
23H
22H
On-chip UART-0
On-chip UART-1
On-chip 8259A-2
On-chip Timer
0
On-chip 8259A-1
On-chip DMA
0
0H
REMAPCFG
Register
Expanded I/O Space
DOS I/O Space
00000 000
Note:
Shaded area indicates that
expanded I/O space peripherals
are not accessible
A2495-02
F000H
FFFFH

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