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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:	4
Original Filename:	http://bitsavers.org/pdf/dec/pdp12/diagnostics/MAINDEC-12-D9CA-D_PDP-12_Operating_Procedure_Dec69.pdf

OCR Text

IDENTIFICATION
Product code:

MAINDEC-12-D9CA-D

Product. Nallie:

PDP-12 O~erating Procedure

bate cte::itecl:

bece;mber i, 1969

Author:

aiiroia i.ahg

ABSTRACT
Due to console switch and control differences between
Family-of-Eight and PDP-12 computers, tpe fol~owing generalized
instructions are given to in.sure proper loaging and starting
of punched paper tape prograrils supplied by DEC for the PDP-12. .

REQUIREMENTS
2.1 :Eguiptnent
a)
b)

Any PDP-12 computer with n,ecessary options for each
particular program.
An ASR-33 ~eletype or equivalent.

2.2 Preliminary Programs
a)

RIM - Formatted tapes require only that the :i:'im l.oader
be in core and ope.ta.ting.
BINARY - Fdrmatt(!d tapes require that the binary load.er
be in core and operating.

LOADING PROCEDURES
3.1 Rim Loader
The Rim Loader is a minimum-logic program designed to load
basic processor and memory diagnostics. It is toggled in from
the console iri the following manner:
a)
b)

cl
d}
e)

f)
g)

h)
i}

Set the MODE switch to 8 MODE.
Set the IF switches to the desired memory pank (usually¢¢¢).
Depress I/o preset.
·
Place the address. of the first instructiqn in the left
switches (7156).
Place the first instruction in the right switches (6¢32).
Depress FILLr this loads the instruct:j.on .at the specified
addres$, aµa also places that address in the MA register.
Depress FILL. STEP7 this reloads the instruction at the
specified address, and increments the Ml\.
Place the second, and succeeding, instructions in th.e right
switches, ¢1epressing fill E1tep after each instruction.
When completed, the MA stiould E!qual 7776.

RIM LOADER
(LOW SPEED}
ADDR
7756
7757
7760
7761
7762
7763
7764
7765
7766
7767
777¢
7771
7772
7773
7774
7775

CONT
6¢32
6¢31
5357
6¢36
71¢6
7¢¢6
751¢
5357
7¢¢6
6¢31
5367
6¢34
742¢
3776
3376
5356

Binary Loader is a rim-formatted proqram designed to
increase loading speed by 50% over the rim loader.
rt is
loaded using the rim loader in the following manner.

Th~

a}
b)
c)
d)
e)

f)
g)
h)
i)
j)
k)
l)

set the MODE switch to 8 mode.
Set the !F 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 transfP.r is
completed, as indicated by the trailer code passing over the
reader, momentarily depress stop.
'T'he Binary Loader is now in core.

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

3.4 Binary.,-Formatted Paper Tapes
The l:)inary loa'cjer must be in core prior to attempting tc;>. loa.d
a binary-formatted paper tape;. once this.is.i.tccomplished, the
program i$ loacjed in the following manner~
·

b)
C:)
d)

f)
g)

h}
i}
j}
4.

Place the program tape in the reader {eit{ter high or low speed)
with the a;i:rows visib~e and pointing in tpe direction of travel.
set the reader to on line;.
set the mode switch to B mode.
Set the left switches. to 7777 •
Set the right switches to 4fd${1fd i f using the low speed read.er,
and to ¢¢¢¢ i f using the high speed reader.
Set the IF switches to the memory bank in which the binary
loader resides {normally fll¢fd).
Depress r/g preset. ·
· ·
Depress start LS.
The program will read into cor.e and the binary 10 ader will'
stop1.the .Ac must equal ¢~9fj, ,if not, a tfansfer error has
occurred, and the program riiust be reloadeCI.
Remove the program tape from the reader.

STARTING PROCEDURES
Refer to the appropriate writeµp for the startinq address and
switch setting~ for each program.
a)
b)
c)

P~ace the ~tarting address in the left s-w:J:tches;.
Place the ~esired switch op1:;ion settings ~n the right switches.
Place the memory bank in which the program.resides in the
·
IF switche~ {normally fdfdfd).
Set the mode switch to 8 mode.
Depress I/6 preset,,
.
.
Depress start LS.
The progra~ is now running as described in the applicable
-writeup!

ERROR ROUTINE
rn general,.whenever a program refers to a particular switch
option se:ttirig ~ that setting wHi be place<'! if.l the right swucl"1es.
When a prqgram refers to an error restart or qptiohal restart
address, that address will be placed in the left switches, and
the start LS key used~
·
·
cont. key has the sa~e function in the PDE.,-12 as in
computers; namely, to contiryu~ execution of a
program after a hait.
· ·

Th~

Family~of~Eight