© Thomas Kunz 2000
SCE 574
71
Example: IBM PC, Intel 8088/8086
äProcessor
äIntel
8088 - PC, XT
ä20
bit address bus
ä8
bit data bus
ä8086 => 16 bit data bus, so it executes more quickly, fewer
cycles needed to load data
äMemory,
example 1 Megabyte (1 MB)
äMemory
map
ä00000 - 9FFF RAM - interrupt vectors, DOS and user program
space
äA0000
- BFFFF RAM - video display memory
äC0000
- FFFFF ROM BIOS, boot ROM
äInput/Output
äParallel
printer interface (can send bits in parallel)
äSerial
communications (one bit at a time)
äKeyboard
- parallel interface
äCRT, Disk controllers, add-on boards....
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