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Burroughs 280

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B280

BURROUGHS B260/B270/B280
MANUFACTURER
Burroughs Corporation

PRODUCTION RECORD
Number produced to date         278
Number in current operation     278
Number in current production    200
Number on order                 200
Anticipated production rate      18/month
Time required for delivery       3 to 6 months

RELIABILITY, OPERATING EXPERIENCE
A complete checking and testing of the equipment is made before release to 
the customer. The system is deigned for easy maintenance. 
Completely equipped and educated field engineering personnel for preventive
maintenance and support.

                     COST, PRICE AND RENTAL RATES
--------------------------------------------------------------------------------
COMPONENTS OF BASIC SYSTEM                           COST OF COMPONENTS
                                       B-260       B-270       B-280    Weight
B260/B27O/B28O    Processor         $ 51,000    $ 56,100    $ 55,475    1,200
B124              Card Reader         15,200      15,200      15,200      300
B304              Card Punch          27,000      27,000      27,000
B321              Line Printer        49,800      49,800      49,800    1,750
                          TOTAL    $ 143,000   $ 148,100   $ 147,475
Additional equipment.:
B102/B103        Sorter-Reader        68,000
B341             Paper Tape Punch      9,500
B122             Card Reader           8,800
B303             Card Punch           18,000
B322             Multiple Tape Lister 66,400
B421             Magnetic Tape        26,600
B141             Paper Tape Reader    16,800
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                                              MONTHLY RENTAL COST
                                        B-260       B-270       B-280
B260/B270/B280   Processor            $ 1,500     $ 1,650    $  1,585
B124             Card Reader   $400
B304             Card Punch     650
B321             Line Printer 1,200 
                                        2,250       2,250       2,250
                              TOTAL   $ 3,750     $ 3,900    $  3,835
Additional equipment:
B102/B103        Sorter-Reader        $ 2,000
B322             Multiple Tape Lister   1,600
B122             Card Reader              220
B421             Magnetic Tape            700
B341             Paper Tape Punch         190
B303             Card Punch               450
B141             Paper Tape Reader        400
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B260

Burroughs B260 Photo by Burroughs   Corporation

APPLICATIONS
Business data processing applications.

B260 is an improved punched card EDP. The system can combine in a single 
run collating, calculating, summarizing, summary punching and printing 
operations which presently require multiple runs on conventional
punched card equipment.

B270 Financial EDP System provides a combination of MICR, punched. card, 
paper tape and magnetic tape capabilities adaptable for every type of 
financial application. The system can be used for proof and transit,
general-purpose financial accounting, or as a satellite to a larger system.

B280 EDP-System. This syetem combines high-speed magnetic tape units with 
high-speed punched card and paper tape capabilities. It can function as 
a low cost EDP system or as an off-line satellite for large scale
computer systems.

PROGRAMMING AND NUMERICAL SYSTEM
Internal number system            Binary coded decimal
Decimal digits/word               Character machine
Decimal digits/instruction,       12, 6-bit characters
Instructions/word                  3
Instructions decoded              42
Arithmetic system                 Fixed point
Instruction type                  Three address
Number range                      12 character operands
Instruction word format
+-------+-------+-------+-----------+-----------+-----------+
|  1    |   2   |   3   |  4     6  | 7       9 | 10     12 |
+-------+-------+-------+-----------+-----------+-----------+
|  OP   |  M    |  N    |    AAA    |   BBB     |   CCC     |
+-------+-------+-------+-----------+-----------+-----------+
| Oper- | Vari- | Vari- | A-Address | B-Address | C-Address |
| ation | ant   | ant   |           |           |           |
+-------+-------+-------+-----------+-----------+-----------+

Automatic coding  
   Report generators  
   Multiprocessing package  
   Assembler  
   Tape sort generator  
   Utility routines

ARITHMETIC UNIT
          Incl. Stor. Access
             Microsec
Add     10     4 + 4 (M + N) + 5L
Mult    10     3 + 6N + 21MN
Div     10     (M + 1 + M - N)(48 + 6 ON)
Arithmetic mode     Serial
 M & N variants of instruction.
 Add - M & N = number of digits in operands,
 Multiple - M = mumber of digits in multiplicand,
 N = number of digits in multiplier.
 Divide - M = number of digits in dividend,
 N = number of digits in divisor.
Timing                Asynchronous
Operation             Sequential
 Simultaneous program operation with multiprocessing
software.

B270

Burroughs B 270                       Photo by Burroughs Corporation

STORAGE
                 No. of        No. of     Access
                 Characters    Digits     Microsec
Magnetic Core     4,800        4,800       10
Magnetic Tape
No. of units that can be connected      6 Units
No. of chars/linear inch of tape      555.5 Chars/inch
Channels or tracks on the tape          7 Track/tape
Blank tape separating each record        0.75 Inches
Tape speed                              90 Inches/sec
Transfer rate                       18,000/50,000 Chars/sec
 Start time                              6.7 Millisec
 Stop time                               7.1 Millisec
 Average time for experienced
operator to change reel of tape         25 Seconds
 Physical properties of tape
 Width                                   0.5 Inches
 Length of reel                      2,400 Feet
Composition                       Heavy-Duty Mylar
The magnetic tape is compatible with the IBM 727, 729, and 7330 tape units. 
Tape rewind speed is 320 inches/second. 
Dual gap read-write heads provide lateral and longitudinal 
parity checking.

INPUT
Medium                Model        Speed
Card Reader           B 122       200 cards/min
Card Reader           B 124       800 cards/min
 (1 or 2 possible in system.
Paper Tape Readers    B 141       500 chars/min
                                1,000 chars/min
 (1 or 2 possible in system). 
Sorter-Reader         B 102/103 1,600 items/min
(Speed for flow mode. 1 possible in system.
The cards are read photo-electrically. 51, 61, or 80 column cards in B 124 
Card Reader, 80 columns only in the B 122 Card Reader. 
Can process MLP cards and post card thicknesses. Cards 
are read serially by character.

OUTPUT
Medium                Model          Speed
Card Punch            B 303       100 cards/min
Card Punch            B 304       300 cards/min
 (1 punch available in system.
Line Printer          B 321
 Single space                     700 lines/min
 Double space                     650 lines/min
(2 printers available in system.
Multiple Tape Lister  B 322     1,565 lines/min
(2 listers available/system).
Paper Tape Punch      B 341       100 chars/min
(1 available in system.
The above listed peripherals use buffered operation permitting independent 
operation. The Line Printer Buffer is loaded in 1.3 millisec. 
The Multiple-Tape Lister Buffer is loaded in 0.7 millisec. 
All other units use buffers located in the processor.

The Line Printer carriage skip speed is 25 to 40 inches/second controlled 
by a 12-channel punched carriage tape. The horizontal spacing is 
10 chars inch, the vertical spacing is 6 or 8 lines/inch.

The paper tape used is 5, 6, 7, or 8 level tape. Any code may be translated.

CIRCUIT ELEMENTS OF ENTIRE SYSTEM
 Type                   Quantity
Tubes                       0
Magnetic Cores          5,044 (Usable)

CHECKING FEATURES
Fixed Core - each character checked for parity. 
Magnetic Tape - lateral and longitudinal parity check. 
Card Reader - validity check on all characters. 
Printer - parity and sychronization check. 
Card punch - hole and row count check. 
Paper Tape Reader - parity check on all characters. 
Paper Tape Punch - Validity check.

POWER, SPACE, WEIGHT, AND SITE. PREPARATION
Power, computer system      13.4 - 36.0 KVA
 Dependent on system configuration.
Volume, computer system    247 - 2,076 cu ft
Area, computer system       59 - 423 sq ft
Room size
             23 ft 6 in x 20 ft 6 in to 27ft 6 in x 27 ft 9 in
Floor loading               30 lbs
                           500 lbs concen max
Capacity, air conditioner    2.7 - 7.5 Tons
Weight, computer system  6,073 - 14,190 lbs
Site preparation requirements
Temperature range         - 72o F, + 8 - 7oF.
Relative Humidity         - 50°% + 10%
The data processing rooms should be of adequate size to functionally layout 
the system units to achieve optimum operating efficiency.