Device Interface Circuits - NEC Advanced Personal Computer System Reference Manual

Processor PCB
l.PHIO
LS14
I
[)o
I>
1::
00
, .
2. IRST
Vee
30 K
LS14
51
1
0.22"'
3. IRQ, lOR, lOW, BHE, DACK
LS14
~~~-----------------[)o~------~I>
4.;_D_Y _ _ _ _ _ _ _ _ _ _ _ : _ _ _
~~----;'""--,
LS OPEN-COLLECTOR
5. IRO TO IRll, DRQO TO DRQl (LS TTL)
Figure 2-9 Device Interface Circuits
2-12