ZiLOG System 8000 Hardware Reference Manual

HRM
Zilog
HRM
The SMD controller has only one 16 bit I/O port, the address
is set by a dip switch located on SMDC A near the P1 (ZBI)
connector. The functions of each key are described below:
KEY
FUNCTION
POSITION
FOR
"7FOO"
1
Re served
ON
{ON
=
O}
2
Address
01
ON
{OFF
=
1}
3
Address
02 ON
4
Address
03
ON
5
Address
04 ON
6
Add re 0303
05
ON
7
Address
06
ON
8
AddrE~ss
07
ON
The I/O por't add re 0303 :.03 "7 FXY", where XY iss pec if i ed by the
dip switch keys 2 thr'ough 8. The I/O address must be even.
The first key is reserved and should be in the "ON" posi-
tion.
A jumper labelled "Piek" (located at SMDC A) may be option-
ally grounded (with shunt installed) to prevent the drive
from eye 1 ing down when con troller power is lost. ( Th i s
feature called Pick and Hold only works with drives that
ha vet his f eat ur e . bui J. tin). In the cas e 0 f the Z :L log 8 "
SMD disk d~ive, leave pick jumper off (shunt not installed).
At the power up sequence, if pick is grounded (wi th shunt
installed) it will enable the first SMD drive to get up to
speed, then the pick signal is transferred to the ne~t
active SMD drive. The drives spin up sequentially, one by
one.
SW1
12
13
14
ON
3 C
2 C
C
•
•
•
OFF
03 KEY 3
02 KEY 2
01 KEY 1
3-20
1:3 (CNAM)
Zilog
00406
3-20

ZiLOG System 8000 Specifications

General

Brand	ZiLOG
Model	System 8000
Category	Desktop
Language	English