 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ä |
Processor
|
|
|
|
ä |
Intel
8088 - PC, XT
|
|
|
|
ä |
20
bit address bus
|
|
|
|
ä |
8 bit
data bus
|
|
|
|
ä |
8086
=> 16 bit data bus, so it executes more
|
|
|
quickly,
fewer cycles needed to load data
|
|
|
| ä |
Memory,
example 1 Megabyte (1 MB)
|
|
|
|
ä |
Memory
map
|
|
|
|
ä |
00000
- 9FFF RAM - interrupt vectors, DOS and
|
|
|
user
program space
|
|
|
|
ä |
A0000
- BFFFF RAM - video display memory
|
|
|
|
ä |
C0000
- FFFFF ROM BIOS, boot ROM
|
|
|
| ä |
Input/Output
|
|
|
|
ä |
Parallel
printer interface (can send bits in parallel)
|
|
|
ä |
Serial
communications (one bit at a time)
|
|
|
|
ä |
Keyboard
- parallel interface
|
|
|
|
ä |
CRT, Disk controllers, add-on boards....
|
|
