Technical information

2.2.1 KDA50 Controller
The KDA50 is an intelligent controller that interfaces with up to four SDI-
compatible mass storage devices on the Q22-bus.
Functional Information
Controller protocol
Bad block replacement
Supported drives
Drives per controller
Controllers
per system
Drive interconnect
Ordering Information
KDA50-SF
KDA50-SG
Performance
ReadIWrite data transfers
Data buffering
Command buffering
Configuration Information
Form factor
Power requirements
Power consumption
Bus loads
Related Documentation
EK-KDA5Q-UG
1 Field installed option.
MSCP
Software dependent
~60,~70,~81,~82,~90
4
1 maximum for VMS 5.1
2
maximum for VMS V5.2 and later
Transformer-coupled radial
~-series disk drive controller, controls up to a
maximum of four RA-series devices
1
Second KDA50 controller, for support of up to four
~-series devices, uses three Q-bus slots 1
Up to 16-byte block mode DMA
32 Kbytes
20 command and response ring buffers
Two quad height
+5 Vdc, 13.5 A (typical)
+12
Vdc, 0.03 A (typical)
67.86
W
3.0 ac
0.5 dc
KDA50-Q User's Guide
2-4 VAX 4000 Model 300 Technical Information