Vax 613 0S Instruction Manual Page 59

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Bits Access Init. Description
2:0 R/W 0 PBS bits for TURBOchannel option #0, 500/800/900
models
5:3 R/W 0 PBS bits for TURBOchannel option #1, 500/800/900
models
8:6 R/W 0 PBS bits for TURBOchannel option #2, 500/800/900
models
11:9 R/W 0 PBS bits for TURBOchannel option #3
14:12 R/W 0 PBS bits for TURBOchannel option #4
17:15 R/W 0 PBS bits for TURBOchannel option #5
20:18 R/W 0 PBS bits for SCSI
23:21 R/W 0 PBS bits for IOCTL
26:24 R/W 0 PBS bits for CXTurbo, 500 models
30:27 R 0 Byte mask for masked I/O read operations; read(0)/no
read(1)
31 R 0 Valid bit for masked I/O read operations
Note
The slots labeled 0-2 on a 400/600/700 model are actually TURBOchannel
option slots 3-5 in the hardware.
TURBOchannel I/O Registers 3–11
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