Specifications

OpenVMS VAX Operating System, Version 5.5-2 SPD 25.01.37
A maximum of three additional TU77 magnetic tape
transports can be added to a TxU77 subsystem and
a maximum of seven additional TE16 magnetic tape
transports can be added to a TxE16 subsystem. Dif-
ferent magnetic tape transports cannot be mixed on the
same tape subsystem.
With disks and magnetic tape transports mixed on the
same MASSBUS, the following rules apply:
• Disks can be added to a magnetic tape subsystem to
a maximum of seven additional disks per tape sub-
system.
• Tapes cannot be added to a disk subsystem.
Asynchronous Terminal Controllers
CXA16 16 line serial terminal multiplexer (DEC-423),
maximum
baud rate supported: 38400. (No
modem control) (Q–bus)
CXB16 16 line serial terminal multiplexer (RS422),
maximum baud rate supported: 38400. (No
modem control) (Q–bus)
CXY08 8 line serial terminal multiplexer (RS232),
maximum baud rate supported: 19200. (Full
modem control) (Q–bus)
DHB32 16 line asynchronous terminal controller for
VAXBI, maximum baud rate supported: 19200.
(VAXBI)
DHF11 32 line asynchronous terminal controller (DEC
423), maximum baud rate supported: 19200.
(No modem control) (Q–bus)
DHT32 8 line asynchronous terminal controller (DEC
423). (No modem control) (Micro/VAX 2000)
DHQ11 8 line asynchronous terminal controller (EIA
RS-232-C or RS-423-A), maximum baud
rate supported: 19200. (Full modem control)
(Q–bus)
DHU11 16 line asynchronous terminal controller (RS-
232-C), maximum baud rates supported: VMS
19200, DECnet–VAX 9600. (Full modem
control) (UNIBUS)
DHV11 8 line asynchronous terminal controller (EIA
RS-232-C or RS-423-A), maximum baud rates
supported: VMS 19200, DECnet–VAX 9600.
(Full modem control) (Q–bus)
DMB32 8 line asynchronous terminal controller, max-
imum baud rates supported: VMS 19200,
DECnet–VAX 9600. (Full modem control)
(VAXBI)
DMF32 8 line asynchronous terminal controller, max-
imum baud rates supported: VMS supports
19200, DECnet–VAX supports 9600. (Full
modem control on first 2 lines) (UNIBUS)
DMZ32 24 line asynchronous terminal controller (EIA
RS-232-C or RS-423-A), maximum baud rates
supported: VMS 19200, DECnet–VAX 9600.
(Modem support dependent on configuration)
(UNIBUS)
DSH32 1 line synchronous (full modem control) and
8 line asynchronous (no modem control)
communications controller for the Micro/VAX
2000. DEC423 devices are supported. Maxi-
mum baud rates supported: VMS 19.2 KBPS
(kilobits/second).
DZ11 8 line asynchronous terminal controller (EIA
RS-232-C or RS-423-A), maximum baud rate
supported: 9600. (Partial modem control)
(UNIBUS)
DZ32 8 line asynchronous terminal controller (EIA
RS-232-C or RS-423-A), maximum baud rate
supported: 9600. (Partial modem control)
(UNIBUS)
DZQ11 4 line asynchronous terminal controller
(EIA RS-232-C or RS-423-A), maximum
baud rate supported: VMS supports 19200,
DECnet–VAX supports 9600. (Partial modem
control) (Q–bus)
DZV11 4 line asynchronous terminal controller
(EIA RS-232-C or RS-423-A), maximum
baud rate supported: VMS supports 19200,
DECnet–VAX supports 9600. (Partial modem
control) (Q–bus)
Integral asynchronous serial lines for the Micro/VAX
2000
and the VAXstation 2000.
On the Micro/VAX 2000, one line is the modem/data line
and three are data-only lines. On the VAXstation 2000,
the lines support keyboard, mouse, modem connection,
and printer or plotter. DECnet–VAX supports all four
asynchronous data/modem RS-232C serial lines up to
9.6 KBPS on the integral 4 line asynchronous controller
for Micro/VAX 2000.
Synchronous Controllers
The VAX Wide Area Network Device Drivers software
product contains the synchronous device drivers and is
required when using synchronous communication op-
tions. Refer to SPD 29.64.xx for more information.
DMB32 Point-to-point synchronous interface. (VAXBI)
DMC1
1 High-speed local point-to-point synchronous
interface; retired device, no longer offered as
an option. (UNIBUS)
DMF32 Point-to-point or multipoint synchronous inter-
face. (UNIBUS)
DMP11 Point-to-point or multipoint synchronous in-
terface; (UNIBUS) retired device, no longer
offered as an option.
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