NorthStar HORIZON Manual page 58

Address
Bus
(from processor)
Controls
to
Disk
256
Byte
PROM
8
16
16
Board Select
Control Logic
Status
from
Disk
8
Multiplexor
Status
Bits
8
8- bit
shift register
Data
Encoder
Data
to
Disk
Data
Separator
Data
from
Disk
Data In
Bus
(to processor)
8
8-bit
shift register
Figure 1T_ Disk Controller Block Diagram
North Star HORIZON Computer
58