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DIGITAL-7-13-I

July 1965

3 pages

Original

72.8kB

Document:	RIM Loader
Order Number:	DIGITAL-7-13-I
Revision:
Pages:	3
Original Filename:	http://bitsavers.org/pdf/dec/pdp7/DIGITAL-7-13-I_RIM_Loader_Jul65.pdf

OCR Text

IDENTIFICATION

1.1

Digita 1-7-13-1

1.2

Read-I n-Mode Loader

1.3

July 21, 1965

PDP

LIBRARY

Digital-7-13-1
Page 1

ABSTRACT

The RIM Loader is a minimum-sized routine for reading and storing information contained on
readin mode tapes via the perforated tape reader.
3.

REQUIREMENTS

3. 1

Storage_
13 Decimal (15 octal) memory locations.

3.3

Equipment
Standard PDP-7.

USAGE

4.1

Loading
The RIM Loader, if not already in core, may be placed in memory by either of two methods.

Since it is a very short program, it may readily be loaded manually by the console switches
and control keys. To do this proceed as follows:
4.1.1
Set into the MEMORY ADDRESS switches the address of the first memory location into which
information is to be loaded. (07763 or 17763)
4.1.2
Set the intended contents (700101) of this location into the ACCUMULATOR switches and
press the DEPOSIT key.
4.1.3
Set the intended contents (617763) of the next memory location into the ACCUMULATOR
switches and press the DEPOSIT NEXT key.

4.1.4

Repeat the last step unti I the whole program has been placed in memory.

Alternately the RIM Loader may be placed in memory by the photo reader if a -punched paper
tape containing the program is avai lable. This tape must be in a format similar to normal binary format
(see below) except that channel 7 is never punched until the last group of three characters occurs. In
this last group the first character only appears with channel 7 punched; the remaining two characters do
not have channe I 7 punched.
Place the tape in the photo reader and set the address at which loading is to commence, 7762
or 17762, in the MEMORY ADDRESS switches. Depressing the READ IN key will now load the program.
4.2

Calling Sequence
None. This routine cannot be called as a subroutine.

4.3

Startup/Entry

4.3.1

Place the RIM format tape in the reader.

4.3.2

Set the ADDRESS swi tches to 17770 (7770 for 4K mach i ne).

4.3.3

Press START

RESTRICTIONS (Not Applicable)

Di gita 1-7-13-1
Page 3
10.

PROGRAM

10.4

Program Listing

As previously stated this program may be placed into the PDP-7 memory by using either the
DEPOSIT key or the READ-I N key.
Location

Octa I Contents

7762 OR 17762
7763
17763
7764
17764
7765
17765
7766
17766
7767
17767
7770
17770
7771
17771
7772
17772
7773
17773
7774
17774
7775
17775
7776
17776

0
700101
617763
700112
700144
637762
700144
117762
057775
417775

1177~l::>2..
0
617771

0
RSF
JMP .-1
RRB
RSB
JMPIR
RSB
GO,
JMS R
G,
DAC OUT
XCT OUT
JMS R
OUT, 0
JMP G

11 •

DIAGRAMS (Not Applicable)

12.

REFERENCES

12. 1

Other' Library Programs

/S UBR OUTI NE TO READ
/AN 18-BIT BINARY WORD
/WAIT FOR FLAG
/READ BUFFER
/FETCH BI NARY WORD
/EXIT SUBROUTINE
/ENTRANCE: SELECT BINARY
/FE TCH A WORD
/STORE IT (DAC OR JMP)
/EXECUTE IT
/READ NEXT WORD
/EXECUTE FIRST OF PAIR
/CONTINUE

See Digital-7-12-I, F.F. Loader and Digital-7-16-I, Block Format Loader.
12.2

Digital Manuals
See PDP-7 Users Handbook, Section 14.