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XX-C0AD8-52

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Document:	LC8-L Parallell Control for LA30-P
Order Number:	XX-C0AD8-52
Revision:
Pages:	10
Original Filename:	http://bitsavers.org/pdf/dec/pdp8/pdp8i/LC8-L_Parallell_Control_for_LA30-P.pdf

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PARALLEL C ONT
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GULICK

MAYNARD,MASS~\KUSETTS

DATE

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17-30 - 71

CD CO o:~

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PARALLEL CPNTROL FOR
LA3fZf-p

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PARALLEL INTERFACE
INTERFACE CABLE

ENGINEERING SPECIFICATION

}\CCBPTANCE PROCEDURE

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ACCESSORY LIST
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TITLE

SIZE CODE

PARALLEL CONTROL FOR LA30'_p
URA 132
I)I("}() (325)

J(J4X

N471

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NUMBER

REV.

LC8-¢ _

1 0 9ILLY'l

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Tt1IS'SCHEMATlC IS fURNISHED ONLY fOR HST .AND MAINTE"ArtCl PU"POSES. THE
CIRCUITS ARE PROPRIETARY IN NATURE AND SHOULD DE TRUTEO ACCORDINGLV

COP'l'RIGHT 1971 .V DIGIT~L EQUIPMENT CO.POIIATIOH

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UNLESS OTHERWISE INDICATED:
CAPACITORS ARE .01 UF ,IOOV, 20~
DIODES ARE DEC664
RESISTORS ARE 330,1/4W, 5:-;
DEC 7474 =E2 ,E4,E6,E 7
DEC7400 =E3,E5,EB,EII
DEC7410 =EIO
DEC7430= EI
DEC7440= E9

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ON ALL IC'S

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DEC fORM NO.
DRD 116

TRANSISTOR &. DlOOE CONVERSION CHART
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DEC
EIA

DEC

DEC6S4

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THIS SCHEMATIC IS FURNISHED ONLY FOR TEST AND MAINTENANCE PURPOSES, THE
CIRCUITS ARE PROPRIETARY IN NATURE AND SHOULD BE TREATED ACCORDINGLY,
COPYRIGHT 1971 BY DIGITAL EQUIPMENT CORPORATION

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RI2
330
CI2
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+5V

R4
220

BH2

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330

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6

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BIT 05

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AL2

AF2

AFI

AH2

AJ2

ANI

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UNLESS OTHERWISE INDICATED:

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AEI

ENABLE
DEVICE
SELECT

1----------1--0 HH

J I IS 1209941
CAPACITORS ARE ,01 UF, 100V, 20%
RESISTORS ARE 1/4W, 5%
EI = DEC7430
E2,E4,E5,E7,E9 BE II = DEC7440
E3 =DEC7404
E6 B E8= DEC7400
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MAVNARO. hoIIAS5ACHUSlETTS

8
This drawing and. specifications, heroin, are the property of Digital Equipment Corporation and s~all not be
reproduced.or copied or used in whole or
part as

LEGE.ND

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DIGITAL EQUIPMENT CORPORATION

ENGINEERING SPECIFICATION

MAYNARD, MASSACHUSETTS

(

TITLE

ENGINEERING' SPECIFICATION
TITLE

DATE

CONTINUATION SHEET

LC8-L

6/30/71

LC8-L
Abstract:

REVISIONS
DESCRIPTION

REV

k:HG NO

ORIG

DATE

APPD BY

DATE

The LC8-L is a parallel trans·fer interface to the LA3.0 DECWriter
for the PDP8/I, 8/L, 12 and DC.02 option. By use of pin compatible
boards, it is a plug-in replacement (for keyboard and printer
functions) wherever the M7.06, M7.07 boards are normally used.
I.

General:
The LC8-L parallel interface is used with the LA30-P DECwriter.
It may be used as a replacement for the console teletype
control on the PDP8/I, 8/L, or 12 or as a control for additiona
LA3.0-P keyboard/printers. The instruction set is identical
to that of the normal teletype control of these machines,
with the following exceptions:
1.

There is no paper tape reader on the LA 3.0 , hence no
reader run.

There is no paper tape punch on the LA3.0.

The maximum input/output rate is 3.0 characters/second.

Output to the printer is only 7 bits (AC5-l1).
bits can be sent, but bit-8 (AC4) is ignored.

If a non-printing character is sent to the LA3.0 printer,
it does not go through a normal print cycle, but indicates
that it is ready to print again in approximately 1-2 psec.

The LA3~ has no hardware TAB, FORM FEED or VERTICAL TAB
features.

CARRIAGE RETURN takes several character times, but the
printer Ready Flag is set again-2 usec. after a CAR RET
instruction. When the next character is sent, however,
the Ready Flag is not set again until the CAR RET has
finished and this character has been printed.

(

ENG

John Kirk

DEC FORM NO.
ORA 107

NUMBER
LC8-I~-l

REV

Eight

ENGINEERING SPECIFICATION

CONTINUATION SHEET

~------,-----------------------------------------------------------------------1
TITLE

LC8-L

ENGINEERING SPECIFICATION
TITLE

It is possible, by changing an internal switch for the
LA3~ keyboard to generate lower case characters.
Normally
this is set so that only upper case character codes are
generated whether the keyboard is in SHIFT or nota

The LA3¢ Printer cannot print lower case characters,
these are interpreted as upper case.

10.

There is no BELLi CNTRL Gis treated as non-printing.

110

End of Line (,. 80 characters) is trapped and any subsequent characters sent before a CAR RET are not printed.

LC8-L

Control Signals:
Receiver Strobe - sent to the LA3~ Printer to enable
printing of a character. There is no printer buffer
internal to the M7719, the data for transmission to
the LA3% is established on the Output Data lines at
the start of the output lOT instruction and Receiver
Strobe is asserted during IOP4 of this same instruction

Demand - sent by the LA3~ Printer to request the next
character, stays true until the next Receive Strobe.

Transmitter Strobe - sent by the LA3~ keyboard and
used on the M77l8 to strobe the character generated
by the keyboard into the keyboard buffer in the M7718.

Number of Data Elements per Character - seven

Logic Levels Between LA3~ and LC8-L - TTL

Cable between

LA3~

and LC8-L

Standard length is 25 feet.
The cable used terminates in
an M9~4 connector at the LA3~ and two H8S6 4~ pin connectors
at the LC8-L.
Connector #1 plugs into the M77l8, Connector
#2 into the M77l9.
The cable assembly is part #

III.

Physical
The LC8-L consists of two double height M-series logic boards
which are pin compatible, for such signals as BMB3-8, lOPs,
AC input and output lines, with the M7~6 and M7~7 teletype
control boards.
The M706 is replaced by the M77l8 and the
M7¢7 by the M77l9.
The W~76D teletype connector is no longer
used Q nor is the module slot into which it plugs.
Instead,
the M77l8 and M77l9 have each only a single module handle
(on the 'B' half of each board) 0 in the area where the lA'
handles would normally be, two H8SS 4~ pin Berg connectors
are mounted with their pins p~inting to the handle ends of
the boards.
The LA3~-P cable plugs into these connectors.

CONTINUATION SHEET

Programming

Specifications - Environment
Operating Temperature
Operating humidity
Storage temperature

:
:
:

o - 55°C
10 - 9~/o non condensing
-15 +6S o C

Specifications - Operating
A.

Type of transmission - Parallel
Type of reception - Parallel

DEC FORM NO 16-1022

The LC8-L uses the standard PDP8/1 teletype keyboard/teleprinter
instruction set with the following changes:
KSF
KCC
KRS
KRB

6,031
6,032
6,034

TSF
TCF
TPC
TLS

6,041

DEC FORM NO 16-1022

6~36

6¢42
6,044
6~46

Skip if keyboard flag is set
Clear AC & keyboard flag
Read keyboard buffer, static
Clear AC, clear keyboard flag and read keyboard
buffer
Skip if printer flag is set
Clear printer flag
Load printer buffer and print
Clear printer flag, load printer buffer & print

ENGINEERING SPECIFICATION
TITLE

LC8-L

CONTINUATION SHEET

Device Codes
The instruction list in Section V assumed that the LC8-L
was replacing the console teletype (device codes ~3 and ~4).
Any device codes that would normally have been used for a
serial interface with the M7~6, M7~7 may be used with the
M77l8 and M77l9 by wiring the appropriate combinations of
BMB 3-8 to pins AD2, AEl, AFl, AHl, AH2, AJI on the M77l8
and pins AE2, AEl, AF2, AFl, AH2, AJ2 on the M77l9.

DEC FORM NO 16-1022

DIGITAL EQUIPMENT CORPORATION

MADE BY
DATE

QUANTITY /VARIATION

MAYNARD, MASSACHUSETTS

ACCESSORY LIST

ON DOCUMENT CHANGE

R. Allen
4/19/72

ENG~~.P
'r'ti:1'J2

DATE "

LEGEND
DOCUMENT

Iu
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NOTICE

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PRO D ~ J a'\_/~)..,{;., II.SSUED SECT. PM PAPER TAPE
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DATE

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DESCRIPTION

NO. DWG NO./ PART NO.

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M8329

Interface Module

7008417

Interface Cable

M7718

Interface Module

M7719

Interface Module

. 7008514

Interface Cable

LIBKI_T- 8E- LC8E

Software Kit

A-Ml-LC8-0

Print Set

nAc-8E-HR3B-D-Lf!R-E

Maintenance

A-SP-IC8-L-l

Engineering Specification

Manual

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TITLE
Accessory Shipping List

SHEET
DEC 16-(325}-1075-N172

DRA 121

I OF

A Al
DIST.

NUMBER

ECO NO

REV.

LC8-0-1

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