”
A/DI/O













“”“Where”—
“”“When”—

,

PC

CPUIntelMultI



LBXCPU1CPU2
SBX BIT





6502Z80NSC800808816

10

STD


”80
(GALPAL) (ASIC)
STD
STD


15716VME bus
31
STD

Furture bus
STD
Nu busSTE
/
BUS IRQn*
16(153016714)
VOH () VOL () VIH () VIL ()
VCC= IOH=6mA VCC= IOL=6mA VCC= IOL VCC=
3.76 3.15
0.37 0.9
2.4 2.0
0.5 0.8
EPROM
MS-DOS100%IBMPC

/

DI/DO

TTL
3

I/O
STD


A/DD/A

0~10mA0~ +5V4~20mA1~5V




1μs
4~20mA D/AV/I









80PLCI/O
I/O128