Data General NOVA ECLIPSE 6234 Service Manual page 35

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Data General Corporation (DGC) has prepared this manual tor use by DGC personnel and customers as a guide to the proper installation, operation, and
maintenance of DGC equipment and software. The drawings and specifications contained herein are the property of DGC and shall neither be reproduced in
whole or in part without DGC's prior written approval nor be implied to grant any license to make, use, or sell equipment manufactured in accordance herewith .
cs
0
ARM
DISK
10 ( 12)
11 ( 13)
2
ARM
8 ( 10)
9
(11)
DISK HUB
6 7
3
ARM
4
5
DISK
2
3
1
ARM
Head number is decimal (octal)
*
Figure 3-9 •
6234/6280 Head Numbering
Table 3-2. Truth Table for Heao Decode
Head Select (HS), Chip Select (CS)
HS3
HS2 HSl
HSO
cs
0
0 0
x
0
0 0 1
x
1
0
1 0
x
3
0
1 1
x
3
1 0 0
x
2
1 0
1
x
2
1
1
x x
*
No chip selected due to an illegal head address
3-13
015-000133