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MAINDEC-12-D9CA-D

December 1969

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Document:	PDP-12 Operating Procedure
Order Number:	MAINDEC-12-D9CA-D
Revision:	0
Pages:	3
Original Filename:	http://bitsavers.org/pdf/dec/pdp12/diagnostics/01_01_MAINDEC-12-D9CA-D_Dec69.pdf

OCR Text

IDENTIFICATION
Product Code:

MAINDEC-12-D9CA-D

Product Name:

PDP-12 Operating Procedure

Date Cre~ted:

December 1, 1969

Author:

Harold Long

ABSTRACT
Due to console switch and control differences between
Family-of-Eight and PDP-12 computers, the following generalized
instructions are given to insure proper loading and starting
of punched paper tape programs supplied by DEC for the PDP-12.

REQUIREMENTS
2.1 £61.uipment
a)
b)

Any PDP-12 computer with necessary options for each
particular program.
An ASR-33 teletype or equivalent.

2.2 Preliminary Programs
a)
b)

RIM - Formatted tapes require only that the rim loader
be in core and operating.
,
BINARY - Formatted tapes req~ire that the binary loader
be in core and operating.

LOADING PROCEDURES
3.1 Rim Loader
The Rim Loader is a minimum-logid program designed to load
basic processor and memory diagndstics. It is toggled in from
the console in the following manrler:
a)
b)
c)
d)
e)
f)
g)
h)
i)

Set the MODE switch to 8 Moog.
Set the IF switches to the desired memory bank (usually~~~).
Depress I/O preset.
Place the address of the first instruction in the left
switches (7756).
Place the first instruction in the right switches (6¢32).
Depress FILL: this loads the instruction at the specified
address, and also places that address in the MA register.
Depress FILL STEP: this reloads the instruction at the
specified address, and incren'lents the MA.
Place the second, and succeeding, instructions in the right ·
switches, depressing fill st~p after each instruction.
When completed, the MA should equal 7776.

RIM LOADER
(Low· SPEED)
CONT
6¢32
6¢31
5357
6¢36
71¢6

ADDR
7756
7757
776¢

7761
7762
7763
7764
7765
7766
7767
777¢
7771
7772
7773
7774
7775

7¢¢6

751¢
5357
7¢¢6

6¢31
5367
6¢34
742¢
3776
3376
5356

3.2 Binary Loader
The Binary Loader is a rim-formatted program designed to
increase loading speed by 50% over the r_im loader. rt is
loaded using the rim loader in the following manner.
a)
b)
c)
d)
e)

f)
g)
h)
i)

J)
k)
1)

Set the MODE switch to 8 mode.
Set the IF switches to the desired memory bank in which the
rim loader resides (usually¢¢¢).
Depress I/O preset.
Set the teletype reader switch to free.
Open the teletype reader and insert the program tape such
that the directional arrows are visible and pointing in
the direction of tape travel with the leader punches over
the sensing fingers.
Close the reader and set the reader switch to start.
Get the teletype front panel switch to on line.
Set the left switches to 7756.
Insure that the computer is set to 8 mode.
Depress start LS.
The program tape will read in: when the data transfer is
completed, as indicated by the trailer code passing over the
reader, momentarily depress stop.
The Binary Loader is now in core.

3.3 Rim-Formatted Paper Tapes
The procedure is identical to loading the Binary Loader,
section 3.2.