Tru64-FAQ-Hardware

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Tru64-FAQ-Hardware
Hardware 1 -- Where can I get information about Alpha chips?

www.alpha-processor.com

Hardware 2 -- What are the pinouts of the MMJ jacks?

This describes the 6-pin modified modular jack (MMJ) used for serial ports on various Digital hardware.

Digital carries four DB-to-MMJ adaptors. They are internally wired as follows:


                   Rdy Out  TX+  TX-  RX-  RX+  Rdy In
Adaptor Gender     1      2    3    4    5     6       Use with:
--------------------------------------------------------------------
H8575-A   F      20      2    7    7    3    6&8     VTxxx terminal
H8571-C   M       6      3    7    7    2     20     Digital printer
H8571-D   M       6      3    7    7    2     20     Modem
H8571-E   M      20      2    7    7    3    6&8     Female terminal
                                                      or LaserWriter
--------------------------------------------------------------------

RS-232 using DB-25 connectors:
                                 DTE                     DCE
                              Terminal                  Modem
                             or computer
Pin Number Signal Name
    2          TD        Transmit Data                   -->;
    3          RD        Receive Data                    <--
    7          GND       Ground                          ---
    6          DSR       Data Set Ready                  <--
    8          DCD       Data Carrier Detect             <--
   20          DTR       Data Terminal Ready             -->;

Hardware 3 -- Where can I get a disktab entry for the XXX disk?

newfs is smart enough to get the geometry of the disk from the drive, although this feature is not documented for all versions. Use:

newfs /dev/rrz#x /dev/rrz#x

For most uses, you don't need a disktab entry on Digital UNIX. The disklabel command can get the default partition table and geometry from the disk driver and will put that in the label. When the label is present, newfs doesn't need a disktab entry either.

A collection of contributed disktab entries is in /pub/DEC/ultrix-disktabs on the usual archive machines. Get a copy of the file for an up-to-date list. The disktab collection may also be used on Digital UNIX, but not all entries have been tested on all platforms.

Hardware 4 -- How can I read/write MS-DOS floppy disks?

If you have a floppy disk drive on your ULTRIX or OSF/1 system, get "mtools", a set of MS-DOS utilities for UNIX. The package can be copied from ftp://prep.ai.mit.edu/pub/gnu/mtools-2.0.7 It works on both DECstations and Alphas.

When you build mtools, you need to find out which device your floppy is (/dev/rrz2c is common). Then you can clone the SPARC definitions, or #define SPARC and make /dev/rfd0c a symlink to the one you need.

Hardware 5 -- How can I get disktab information for a new disk?

For disks that do not have entries in the /etc/disktab file, the following disklabel command will query the disk itself for geometry information:

disklabel -rw /dev/rrzXc unknown

Where /dev/rrzXc is the device name of the disk.

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