2.11BSD/man/cat4/dr.0

DR(4) UNIX Programmer's Manual DR(4)

NAME
dr - DR11-W general purpose interface driver

SYNOPSIS
/sys/conf/SYSTEM:
NDR _d_r_1_1-_w__u_n_i_t_s # DR11-W

/etc/dtab:
#Name Unit# Addr Vector Br Handler(s) # Comments
dr ? 172410 124 5 drintr # dr11-w (b-bus emulator)
dr ? 172430 130 5 drintr # dr11-w (gc-bus emulator)
dr ? 172450 134 5 drintr # dr11-w (em-2 interface)

major device number(s):
raw: 12
minor device encoding:
bits 0007 specify DR unit

DESCRIPTION
The _D_i_g_i_t_a_l _E_q_u_i_p_m_e_n_t _1_9_8_1-_8_2 _P_e_r_i_p_h_e_r_a_l_s _H_a_n_d_b_o_o_k states
the following about the DR11-W:

The The DR11-W is a general purpose, direct memory
access (DMA) interface to the PDP-11 UNIBUS or VAX
UNIBUS. The DR11-W moves data directly between memory
and the UNIBUS to and from the user's peripheral.

It features:

o+ Word or byte transfers.

o+ Programmed or direct memory access (DMA) block
transfers.

o+ Burst data transfers.

o+ User-controlled transfer rates up to memory speed.

The DR11-W is a 53-line direct memory access (DMA)
interface to the PDP-11 UNIBUS or VAX UBA, which allows
the user to control data transfers between the host
processor and a peripheral. The DR11-W has 32 data
lines (for transferring 16-bit parallel data) and 21
control lines (for transferring control and status
information.

When used as an interprocessor buffer (IPB), the DR11-W
allows data transfers between two processors. Inter-
processor communication is accomplished by attaching
one DR11-W to each processor UNIBUS or UBA and then
cabling the two DR11-Ws together.

Printed 11/26/99 January 27, 1996 1

DR(4) UNIX Programmer's Manual DR(4)

There. Now you know as much about it as I do.

A number of _i_o_c_t_l(2) calls apply to the dr devices, and have
the form
#include <pdpuba/drreg.h>
ioctl(fildes, code, arg)
int *arg;
The applicable codes are:

DRGTTY Get DR11-W status.

DRSTTY Set flags and function.

DRSFUN Set function.

DRSFLAG Set flags.

DRGCSR Get CSR and WCR.

DRSSIG Set signal for ATTN interrupt.

DRESET Reset DR11-W interface.

DRSTIME Set timeout.

DRCTIME Set timeout inactive.

DROUTPUT Put word in output data register.

DRINPUT Get word from input data register.

DRITIME Don't ignore errors on timeout.

FILES
/dev/dr[0-7] device special files
/dev/MAKEDEV script to create special files
/dev/MAKEDEV.local script to localize special files