Date: Sun, 17 Jan 93 20:03:00 PST
From: cdl@edu.ucsd.mpl (Carl Lowenstein)
To: info-pdp11@com.transarc
Subject: DLV11J alias DLVJ1

OK, here goes a graze through the manual.  By the way, the right FM
is "Microcomputer Products Handbook EB26078" Digital Equipment Corp. 1985.
A very informative book, it stands out in a decade of DEC handbooks
as the only one with real information in it.

The M8043 is a 4-channel asynchronous serial line unit, known as DLVJ1,
previously known as DLV11-J.

E,D,S,P per channel can be connected either to 0 or 1.  The 0'ness and
1'ness are the same as the address jumpers, which are labelled near
the connector end of the board.

The standard    E = 0   Odd parity
configuration:  D = 1   8 data bits
                S = 0   1 stop bit
                P = 1   Parity inhibited

Data rate selection is done by pins labelled 0,1,2,3 for the 4 channels,
and another set U = 150
                T = 300
                V = 600
                W = 1200
                Y = 2400
                L = 4800
                N = 9600
                K = 19200
                Z = 38400

The configuration of the address and vector jumpers is somewhat complicated
by the fact that channel 3 can be pre-empted to be at the standard PDP11
console address, somewhat independent of the addresses assigned to the
other channels.

Address bits <12-8> have 3 wire-wrap posts, labelled 0 1 X
Jumper X to 1 for a 1   Jumper X to 0 for a 0

Address bits <7,6> have two wire-wrap posts.
Jumper in for a 1       Jumper out for a 0

Jumpers C1 and C2 select the console address.  To have a console at
standard address (177560) install both jumpers X to 1.  To have merely
another serial port in the block of addresses selected by address bits
<12-6> install both jumpers X to 0.

Vector bits <7,6> have two wire-wrap posts.
Jumper in for a 1       Jumper out for a 0

Vector bit 5 has 3 wire-wrap posts.
If channel 3 is to be at the console address, jumper X to 0
Otherwise, jumper X to 1 for a 1, remove jumper for a 0

By the way, the use of channel 3 as a console device requires that
the base address be set to 176500, 176540, or 177500.

The standard configuration of the board is

                        addr    vec
        channel 0       176500  300
        channel 1       176520  320
        channel 2       176540  340
        channel 3       177560  060

The jumpers M0,N0 and so on for the other channels can be used
to set up the line drivers/receivers for balanced RS422 rather
than the unbalanced RS232/RS423 that is the standard setup.

For RS422, jumper M0 to 2 in its line of 3 posts,
likewise jumper N0 to 2.  
Also add a 100-ohm termination resistor, on the pads provided.

For RS232, jumper M0 to 3, and N0 to 3 (standard setting).

Lots more than you really wanted to know, I'm sure.

By the way, here's one more useful bit of information, not findable
in almost any DEC manual.

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DLV11-J Connector, seen from edge of card:

  9  7  5  3  1

 10  8  6  4  2

                        RS232           RS232
                        for DTE         for DCE
Signals on connector    usually female  usually male
 1      UART clock
 2      GND             7               7
 3      Xmit data +     3               2
 4      Xmit data -
 5      GND
 6      index key
 7      Rcv data -      jump to 9       jump to 9
 8      Rcv data +      2               3
 9      GND
10      +12v                            20 (DTR)

                        connect to      connect to
                        terminal        modem
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