CHAPTER
1
INTRODUCTION
1.1
INTRODUCTION
The
CRt
I/CMl
1 Card Reader System
is
a card handling system designed
to
interface with the PDP-II family
of
processors and peripherals
to
read marked
or
punched Hollerith data cards
at
rates up to 600 cards per minute.
The
CRll/CMII
System consists
of
two distinct components: a card reader and a DEC PDP-II interface unit,
which
is
referred
to
as
the
CRII
Controller.
a.
Card Reader
b.
CRII
Controller
1.2 SCOPE
A motorized card handling device
that
reads information from EIA standard
(Hollerith code) cards. The unit reads I2-row, 80-column cards
at
a nominal
rate
of
200
to
600 cards per minute, depending on the specific card reader
used. Q
The
CRII
System
is
fully compatible with
DocumationVpunched
card
and mark/sense readers and GDI punched card and mark/sense readers.
An interface between the card reader and
the
PDP-II Unibus. Controls
data
transfers between the card reader and other devices
in
a PDP-II System.
Provides a 12-bit
output
character for standard data transfers and an 8-bit
output
character (one byte) when
it
is
desired
to
use the proposed compressed
Hollerith code. Also monitors reader operation and issues appropriate con-
trol commands.
The controller
is
completely plug-compatible with the above-mentioned card
readers; no modifications are required.
Also referred to
as
"control unit", "interface", and "reader control".
This manual provides the user with the information needed
to
operate the
CRI1/CMll
Card Reader System and
provides the theory
of
operation and logic diagrams necessary to understand and maintain the
CRt
I Controller.
The CRI l/CMI 1 Card Reader System
is
referred
to
in this manual
as
the
CRII
Card Reader System.
This manual and the appropriate card reader manual must be used together for a complete understanding
of
the
entire
CRII
System. The prime subject
of
this manual
is
the
CRII
Controller. In addition
to
providing com-
plete coverage
of
the controller, this manual includes sections covering overall system operation and programming.
Because
of
the number
of
different card readers
that
can be used with
the
CRl1
Controller, this manual only cov-
ers
the
operation
of
the Documation Model M200 Card Reader. Operation
of
other card reader models,
as
well
as
any significant differences, are included in Appendix
A.
§ Documation
is
a trademark
of
Documation, Incorporated, Melbourne, Florida.
1-1
