TU(4) BSD Programmer's Manual (VAX Architecture) TU(4)
t
\btu
\bu - VAX-11/730 and VAX-11/750 TU58 console cassette interface
S
\bSY
\bYN
\bNO
\bOP
\bPS
\bSI
\bIS
\bS
o
\bop
\bpt
\bti
\bio
\bon
\bns
\bs M
\bMR
\bRS
\bSP
\bP
(for VAX-11/750's with an MRSP prom)
D
\bDE
\bES
\bSC
\bCR
\bRI
\bIP
\bPT
\bTI
\bIO
\bON
\bN
The t
\btu
\bu interface provides access to the VAX 11/730 and 11/750 TU58 con-
The interface supports only block I/O to the TU58 cassettes. The devices
are normally manipulated with the arff(8) program using the ``f'' and
The device driver is automatically included when a system is configured
to run on an 11/730 or 11/750.
The TU58 on an 11/750 uses the Radial Serial Protocol (RSP) to communi-
cate with the cpu over a serial line. This protocol is inherently unre-
liable as it has no flow control measures built in. On an 11/730 the
Modified Radial Serial Protocol is used. This protocol incorporates flow
control measures which insure reliable data transfer between the cpu and
the device. Certain 11/750's have been modified to use the MRSP prom
used in the 11/730. To reliably use the console TU58 on an 11/750 under
UNIX, the MRSP prom is required. For those 11/750's without an MRSP
prom, an unreliable but often useable interface has been developed. This
interface uses an assembly language ``pseudo-dma'' routine to minimize
the receiver interrupt service latency. To include this code in the sys-
tem, the configuration must _
\bn_
\bo_
\bt specify the system will run on an 11/730
or use an MRSP prom. This unfortunately makes it impossible to configure
a single system which will properly handle TU58's on both an 11/750 and
an 11/730 (unless both machines have MRSP proms).
/dev/tu1 (only on a VAX-11/730)
D
\bDI
\bIA
\bAG
\bGN
\bNO
\bOS
\bST
\bTI
\bIC
\bCS
\bS
t
\btu
\bu%
\b%d
\bd:
\b: n
\bno
\bo b
\bbp
\bp,
\b, a
\bac
\bct
\bti
\biv
\bve
\be %
\b%d
\bd.
\b. A transmission complete interrupt was received
with no outstanding I/O request. This indicates a hardware problem.
t
\btu
\bu%
\b%d
\bd p
\bpr
\bro
\bot
\bto
\boc
\bco
\bol
\bl e
\ber
\brr
\bro
\bor
\br,
\b, s
\bst
\bta
\bat
\bte
\be=
\b=%
\b%s
\bs,
\b, o
\bop
\bp=
\b=%
\b%x
\bx,
\b, c
\bcn
\bnt
\bt=
\b=%
\b%d
\bd,
\b, b
\bbl
\blo
\boc
\bck
\bk=
\b=%
\b%d
\bd.
\b. The driver en-
tered an illegal state. The information printed indicates the illegal
state, operation currently being executed, the I/O count, and the block
t
\btu
\bu%
\b%d
\bd r
\bre
\bec
\bce
\bei
\biv
\bve
\be s
\bst
\bta
\bat
\bte
\be e
\ber
\brr
\bro
\bor
\br,
\b, s
\bst
\bta
\bat
\bte
\be=
\b=%
\b%s
\bs,
\b, b
\bby
\byt
\bte
\be=
\b=%
\b%x
\bx.
\b. The driver entered an ille-
gal state in the receiver finite state machine. The state is shown along
with the control byte of the received packet.
t
\btu
\bu%
\b%d
\bd:
\b: r
\bre
\bea
\bad
\bd s
\bst
\bta
\bal
\bll
\ble
\bed
\bd.
\b. A timer watching the controller detected no inter-
rupt for an extended period while an operation was outstanding. This
usually indicates that one or more receiver interrupts were lost and the
transfer is restarted (11/750 only).
t
\btu
\bu%
\b%d
\bd:
\b: h
\bha
\bar
\brd
\bd e
\ber
\brr
\bro
\bor
\br b
\bbn
\bn%
\b%d
\bd,
\b, p
\bpk
\bk_
\b_m
\bmo
\bod
\bd %
\b%o
\bo.
\b. The device returned a status code in-
dicating a hard error. The actual error code is shown in octal. No re-
tries are attempted by the driver.
S
\bSE
\bEE
\bE A
\bAL
\bLS
\bSO
\bO
H
\bHI
\bIS
\bST
\bTO
\bOR
\bRY
\bY
The t
\btu
\bu driver appeared in 4.1BSD.
The VAX-11/750 console interface without MRSP prom is unuseable while the
system is multi-user; it should be used only with the system running sin-
gle-user and, even then, with caution.
4th Berkeley Distribution June 5, 1993 2
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