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MAINDEC-12-D9CA-D

December 1969

4 pages

Original

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Document:	PDP-12 Operating Procedure
Order Number:	MAINDEC-12-D9CA-D
Revision:	000
Pages:	4
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/maindec-12-d9c/maindec-12-d9ca-d.pdf

OCR Text

IDENTIFICATION
Product Code:

MAINDEC-12-D9CA-D

Product Name:

PDP-12 O~erating Procedure

batP Crer>ted:

December 1, 1969

Author:

Harold Long

ABSTRACT
Due to console switch and control differences between
Family-of-Eight and PDP-12 computers, the fol~owing 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 ?S.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 require that the binary loader
be in core and operating.

LOAD.ING PROCEDURES
3.1 Rim Loader
The Rim Loader is a minimum-logic program designed to load
basic processo~ and memory diagnostics. rt is toggled in from
the console in the following manner:
a)
b)
c)
d)
e)
f)
g)
h)
i)

Set the MODE switch to 8 MODE.
Set the IF switches to the des ired memory bank (usually [iJ[iJ[iJ).
Depress I/0 preset.
Place the address of the first instruction in the left
switches (7756).
Place the first instruction in the right switches (6[iJ32).
Depress FILL~ this loads the instruction at the specified
address, apd also places that address in the MA register.
Depress FILL STEP1 this reloads the instruction at the
specified address, and increments the MA.
Place the second, and succeeding, instructions in the right
switches, µepressing fill step after each instruction.
When completed, the MA should equal 7776.

RIM LOADER
(LOW SPEED)
ADDR
7756
7757
776¢
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

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

c)
d)
e)

f)
g)

h)
i)
j)

k)
l)

Set the MODE switch to 8 mode.
Set the IF switches to the desired memory bani< in which the
rim loader resides (usually¢¢¢).
Depress I/O preset.
Set the teletype reudcn:· switch to free.
open the teletype rec«:'!er 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.
Tm;ure that the computer is set to fl 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.
'rhe Binary Loader is now in core.

3. 3 R:i,__m-Formatted Par.er Tapes
The procedure is identical to loading the Binary Loader,
section 3.2.

3.4 Binary-Formatted Paper Ta12es
The binary loader must be in core prior to attempting to load
a binary-formatted paper tape. once this is accomplished, the
program is loaded in the following manner.
a)
b)
c)
d}
e}
f}
g)
h)
i}
j)

Place the program tape in the reader (eitper high or low speed)
with the arrows visible and pointing in the direction of travel.
Set the reader to on line.
Set the mode switch to 8 mode.
Set the left switches to 7777.
Set the right switches to 4flfflfflf if using the low speed read.er,
and to flfflfflfflf i f using the high speed reade!·
Set the IF switches to the memory bank in which the binary
loader res:i.des (normally flfflfflf).
Depress I/O preset.
Depress start LS.
The prograrn wi 11 read into cor.e and the binary load.er will'
stop~ the AC must equal flfflJflfflJ, if not, a transfer error has
occurred, and the program must be reloaded.
Remove the program tape from the reader.

STARTING PROCEDURES
Refer to the appropriate writeup for the starting address and
switch settings for each program.

al
b)
c)
d)
e)
f)
g)

Place the starting addtess in the left switches.
Place the desired switch option settings in the right switches.
Place the memory bank in which the program resides in the
IF switches (normally flfflfflf).
Set the mode switch to 8 mode.
Depress I/6 preset.
Depress start LS.
The program is now running as described in the applicable
writeup.

ERROR ROUTINE
In general, whenever a program refers to a particular switch
option setting, that setting will be placed itj the right switches.
'tlhen a program refers to an error restart or optional restart
address, that address will be placed in the left switches, and
the start LS key used.
The cont. key has the same function in the PDP~l2 as in
Family-of-Eight computers, namely, to continu¢ execution of a
program after a halt.