disadvantages,O
~ In general, operation over leased voice-grade lines with IBM modems at 1200 or 2400 bps requires no conditioning; opera-tion at 4800 bps requires Cl condiopera-tioning. IBM markets an external 2400 bps modem (3872) and a 4800 bps modem (3874). The EIA interface is compatible with IBM, Bell System, and independent modems of appropriate char-acteristics.
All 3770 models include space compression/expansion for elimination of long sequences of spaces from transmission.
A 2-character sequence replaces up to 63 spaces. This fea-ture is usable with non-transparent data in either BSC or SDLC protocol as long as the diskette drive is neither the source nor destination of the transmitted data.
A 3770 terminal (any model) using SDLC line protocol can operate as a tributary station on a multipoint leased line with IBM 3270, 3601, 3602, 3614, 3624, 3631, 3632, 3651 Model 50, 3767, and 3791 terminals, and System/32, System/
34, and Series/l processing units; a System/370 including a 3704/3705 Controller acts as the control station. All ter-minals and 3704/3705 features must be operating with the same type of clocking source (self-clocked modem or business-machine provided clocking) and at the same transmission speed.
Emulation software is available that permits the program-mable 3774-Pl and -P2 and 3775-Pl to function as the non-programmable 3774-1 and -2 and 3775-1, which are no longer available, to provide compatibility with existing arrange-ments.
DEVICE CONTROL
All models execute off-line data entry and document pre-paration functions under the direction of user-written appli-cation programs, which are written from a subset of IBM 3790 programming statements combined with 3770 state-ments that control punched card I/O, display, Itnd diskette storage operations. Programmable functions include: data entry checking for range and self-check numbers, alphabetic or numeric-only fields, and field length; logical operations that include compare and test; conditional and unconditional branching; arithmetic operations including add, subtract, multiply, and divide; horizontal and vertical forms control;
format and edit operations for picture, justify, fill, and case;
support for data transfer from storage to storage, immediate data to storage, and diskette storage operations; operation with sequential data on diskettes (relative data sets); and operation with user-created indexing to data sets. Program control is provided for diskette storage, the optional 480-character display, the 2502 or 3501 Card Reader, and the 3521 Card Punch. The 3521 Read feature can serve as an alternative to the 2502 and 3501 Card Readers. Program-ming statements provide for writing on the display by
char-acter, field, or line, erasing the screen, and vertically and horizontally positioning the cursor. The display can be used to exhibit error messages, keyed data, responses to inquiries addressed to the data sets stored on diskettes, and fill-in-the-blanks data entry forms. Off-line operations can be auto-matically interrupted to receive an unsolicited CPU message, which is stored on diskette and conditionally printed. The interrupted program is then resumed.
Programmable Communications allows a 3774 or' 3775 to initiate and control a communications session with the host computer and to execute a program, including peripheral input/ output, during the communications session. Essentially, the communications line can be treated by the programmer as another input/output device. For SDLC operation, SNA protocols are used to maintain com-munications. The function is also available for BSC terminals.
The Programmable Communications feature requires 7K bytes (SDLC) or 2K bytes (BSC). The card punch requires 3K bytes. Additional memory is required for working stor-age buffers, the card reader and the display.
Application programs for terminals are assembled on a System/370 computer via a DOS/VS or OS/VS Assembler and 3790 Host Support, including a Macro Library contain-ing a Program Validation Services (PVS) program. As-sembled programs are validated, optionally tested, and for-matted for the terminal by the PVS program. The assembled program is transmitted to the appropriate terminal and stored on diskette. Upon request, the stored program is loaded into terminal program storage from diskette, where it is executed. Program selection can be operator or CPU initiated. The selected program can call another program from diskette storage without operator or CPU interven-tion. An operator-selectable job control capability permits selection and execution of a predefined series of 3770 pro-grams; the executing program can alter the series.
CPU messages can add or delete 3770 application programs;
create, load, erase (the contents of) or delete a data set at a 3770 terminal; solicit a data set from a 3770; select and initiate program execution at a 3770; initiate an automatic power-down sequence at a 3770; and deliver formatted data for a non-programmable 3770, which is received and written to a system data set on diskette. The programming state-ments for a programmable 3770 provide support for trans-mitting the formatted data to the printer under control of an application program.
For SDLC operation, the 3770 series terminals are supported for IBM System/370 Model 115 through 168 systems includ-ing a 3704 or 3705 Communications Controller (usinclud-ing NCP / VS) attached locally or remotely and operating under DOS/
VS, OS/VSl, or OS/VS2. Access methods supported are VT AM or TCAM through VTAM. IMS/VS support under OS/VSl or VS2 and CICS/VS support under DOS/VS, OS/VSl, or OS/VS2 is provided. Remote job entry support is provided under the three operating systems by POWER/
VS (DOS/VS), RES (OS/VSl), and JES2, JES2/NJE, and JES3 (OS/VS2).
Programming support via 3790 Host Support is provided under DOS/VS, OS/VSl, or OS/VS2.
A BSC 3770 terminal with appropriate input and output devices and optional features is supported under a subset of the support provided for the 2770 terminals. Specific fea-tures and functions available on the 2770 but riot the 3770 family which may affect user applications programming include conversational mode, terminal-to-terminal operation, status message, 128/128 and 512/512-byte alternating buffer (supported for the 3776), security ID, printing EBCDIC transparent data, 1053 ribbon shift, punch column 81, and . . . AUGUST 1979 © 1979 DATAPRO RESEARCH CORPORATION, DELRAN, NJ 08075 USA
REPRODUCTION PROHIBITED
C21-491-104
Programmable Terminals
IBM 3774/3776 P Series Programmable Keyboard/Printer Terminals
~ expanded 144-position print line. The full selection of input and output devices available with a 2770 terminal is not implemented for 3770's, whicb may require changes in both programming and procedures.
COMPONENTS
KEYBOARD: Tbe standard typewriter-style keyboard consists of 44 alpbanumeric data keys in an EBCDIC arrangement. The functions of the underscore/byphen, back-space, back-space, and "Print Character" keys are repeated auto-matically when the keys are beld down. The optional ASCII Feature provides 48 ASCII data keys, capable of producing 94 ASCII graphics, in place of the standard 44 keys. In addi-tion to the data keys, the keyboard contains funcaddi-tion keys, operating mode swltcbes, indicator lights, and a 3-position numeric display. A Keylock feature disables all operator-activated controls.
MATRIX PRINTER: This bidirectional wire-matrix unit is the standard printer in the 3774 Communications Terminals.
It prints serially by cbaracter at a rated speed of 80 or 120 characters per second, depending upon the model (see price list). There are 132 print positions, spaced 10 to the incb.
Vertical spacing is 6 or 8 lines per incb. A 94-character set is standard.
Up to 6-part forms ranging from 3 to 15 inches in width can be used. A friction-feed platen is standard, and a variable-width forms tractor for pin-feed forms is optional. An optional forms stand facilitates the feeding and stacking of continuous forms.
LINE PRINTER, 120 LPM: This unit is the standard printer in the 3775 Communication Terminal. It normally prints a line at a time from characters engraved on the revolving inter-changeable metal print belt. During a key entry operation, however, the print platen lowers to enable the operator to see the line being printed. Maximum print speed is 120 Ipm with a 64-character set or 80 Ipm with a 94-character set.
Both sizes of character sets are available with either EBCDIC or ASCII grapbics. There are 132 print positions, spaced 10 to the incb. Vertical spacing is 6 or 8 lines per inch. A variable-width forms tractor feeds continuous forms up to 15 inches in width. A Dual Independent Forms Feed option permits two forms of different sizes to be printed at the same time using two independently indexed pin feed mechanisms.
3784 LINE PRINTER: This optional output device, avail-able only with 3774 Communication Terminal, is functionally similar to the 377'Ss integral line printer described in the paragraph above. The 3784, however, can also be equipped with a 48-character set, giving the user a choice of three rated print speeds: 1551pm with the 48-cbaracter set, 120 Ipm with the 64-character set, or 80 Ipm with the 94-character set.
Dual buft'ers, 132 print positions, and a variable-width forms tractor are all standard. A 3784 Attachment is required on the 3774.
2502 CARD READER: Reads 8O-column cards punched in ASCII or EBCDIC code (determined by transmission code selection). Two models are available, which differ only in rated speed. Model AI reads 150 cards/minute; Model A2 reads 300 cards/minute. The input hopper holds 700 cards, and the output stacker holds 600 cards. Options permit read-ing 51- or 8O-column cards, 66- or 80-column cards, and mark-sense (optical) reading. Mark-sense reading permits marking up to 40 columns; marked and/or punched data can be read from the same card. Cards having unacceptable marks are offset-stacked. The 2502 can be attached to a 3774
or 3775 equipped with the 3782/2502 Card Reader Attach- ( ...
ment feature via the 3782 Model 2 Card Attachment Unit. \ 3501 CARD READER: A table-top unit that reads 80-column cards serially at SO cards per minute. Cards can be punched in either EBCDIC or ASCII. The input hopper and output stacker each hold about 400 cards. The 3501 requires a 3501 Card Reader Attachment feature on the 3774 or 3775.
3521 CARD PUNCH: A table-top unit that punches cards at 50 cards/minute. The input hopper and output stacker each hold ahout 400 cards. The 3521 requires a 3782/3521 Card Punch Attachment feature on the 3774 or 3775 and the 3782 Model I Card Attachment Unit. The 3521 fits atop the 3782. The Card Print feature permits printing up to 80 char-acters along the top edge of a card; a 64-character set from either EBCDIC or ASCII is used. The Card Read/Punch Check feature enables a 3521 to function as a card punch or a card reader. Cards cannot be read and punched in the same cycle. The feature also enables a column-by-column com-parison between punch data and data read from the card after punching; a failure of this check stops the punch and lights an error indicator. The Punch Check feature must be inhibited if cards with internal scores or prepunched data are punched. If the 3770 terminal is already equipped with a 3501 or 2502 Card Reader, the Card Read portion of this feature is inoperable.
DISKETTE DRIVE: Reads and writes on same type of flexible disk used in IBM 3740 data entry equipment. Data organization is the same as in the 3740; i.e., data is recorded on one side of the diskette in sectors of 128 characters. There are 74 tracks and 26 sectors per track. The first track is reserved, as it is in the 3740. In addition, two sectors (one 256-character record) are reserved for job identification. The I, maximum storage capacity is 949 256-character records, or 242,944 characters. Data is read or written via one movable read/write head.
Data can be organized on the diskettes in two ways. An interchange format records the 256-character record in two consecutive sectors; appropriately prepared diskettes can be interchanged with 374O's. In the 3770 mode, the 256-character buffer record is written in two non-consecutive sectors for increased performance.
The diskette drives are located in the desk pedestals. Key-locks are available for one or both doors. The 3774 and 3775 are delivered with both pedestals in place, whether or not the two drive options are installed.
OPERATOR ID READER: Reads magnetic stripe cards using the ABA format. A total of 40 characters can be read from the stripe. The cards are the size of a standard credit card (:Pis by 2'1a inches). The encoding format on the stripe is four bits plus parity for each character.
PRICING
All 3770 series models and components (except the 2502 Card Reader) are available under IBM's LRA (Lease Rental Agreement) which provides month-to-month rental and two-year lease arrangements, and for purchase. All monthly charges below include prime shift maintenance; a separate plan is available for purchased units. Unlimited usage is included under either monthly plan. Extended maintenance is available at extra cost up to a total premium of about 40 percent for 24 hours per day 7 days per week coverage.
II
© 1979 DATAPRO RESEARCH CORPORATION, DELRAN, NJ 08075 USA REPRODUCTION PROHIBITED
AUGUST 1979
#1460
#1461
#1470
#1462
#1481
#1482
#3701
#5500
#5501
#5502
#5600
#5602
#5610
#7951
#3901
#1201
#1390
#3250
#3401
#3402
#4650
#3551
#4660
#5450
#6010
#4901
#4902
IBM 3774/3775 P Series Programmable Keyboard/Printer Terminals
Remote ConnectIOn
~ to Host Computer
Desk Console Keyboard
80 cps 13714.P,I.
120 cps ~3114.P2',
"
120 Ipm (3775 P1) Printer 3250 Record [hspIayFeaturl!
6K bytes Memorv Addmonel 4K, 81<:, 12K. or 16K bytes
Memory
---Diskel1eDrille
DisketteOnw
80/120/155Ipm;
3174 only
Card 5Qcpm
j---g]
Rqder 501OR 1
OR 1 I
150 Of' JOOcpm
5O",m
Monthly Rental*
Short Ext.
Term Term
3774-Model P1; 80 cps printer $325 $277
Model P; 120 cps printer 367 312
3775-Model P1; 1 20 Ipm printer 492 419
Features
Communications
Feature-SDLC/BSC, Switch Control 26 22
BSC, Point-to-Point 15 13
SDLC 13 11
BSC Multipoint 13 11
Communications
Driver-W/o Business Machine Clocking 13 11
With 1200 bps Business Machine Clocking 15 13
EIA Interface 13 11
1200 bps Integrated
Modem-Non-Switched 19 16
Switched, Auto-Answer 26 22
Switched, Manual Answer 19 16
2400 bps Integrated
Modem-Non-Switched, Point-to-Point 71 60
Non-Switched, Multipoint 76 65
Switched with Auto-Answer 76 65
Switched Network Backup 11 9
Modem Fan-Out 21 18
ASCII Feature 18 15
Audible Alarm 40" 40"
Display, 480 characters 98 83
Door Keylock 15'* 15"
Door Keylock, Dual 30** 30'*
Keylock 35** 35*'
Dual Independent Forms Feed (3775 only) 29 25
Keypad, Numeric
I
12 10Operator 10 Reader 13 11
Record Format Feature 26 22
Diskette
Storage-First 72 61
Second 72 61
C21-491-105 Programmable Terminals
Monthly Purchase Maint.
$10.560 $122.00 11,920 131.00
16,000 157.00
840 5.50
520 3.00
440 3.00
440 1.00
440 2.00
520 3.00
440 1.00
668 4.00
840 4.00
668 4.00
2,320 5.00 2,520 5.00 2,520 6.00
360 0.50
720 1.00
600 0.50
40 0.50
3,200 36.00 15
30 35
1,000 11.50
400 2.00
440 1.50
840 4.50
2,360 17.00
2,360 7.00 ~
AUGUST 1979 © 1979 DATAPRO RESEARCH CORPORATION, DELRAN, NJ 08075 USA REPRODUCTION PROHIBITED
C21-491-106
Programmable Terminals
IBM 3774/3775 P Series Programmable Keyboard/Printer Terminals
Monthly Rental*
Short Ext.
Term Term Storage
Increments-#6800 4K 18 15
#6801 8K 33 28
#6802 12K 46 39
#6803 16K 60 51
I/O Attachment
Features-#8050 3501 Card Reader 13 11
#8149 378212502 Card Reader 19 16
#8150 3782/3521 Card Punch 19 16
#8155 3784 Printer (3774 only) 19 16
I/O Devices
3782 Card Attachment Unit:
Modell; for 3521 Card Punch 42 36
Model 2; for 2502 Card Reader 61 52
Optical Mark Read 26 22
2502 Card Reader:
Model Al; 150 cpm 150
Model A2; 300 cpm 187
Interchangeable Feed; 51/80 or 66/80 col. 32
Optical Mark Read 148
3501 Card Reader; 50 cpm 119 101
3521 Card Punch; 50 cpm 248 211
Card Print 72 61
Card Read/Punch Check 63 54
3784 Line Printer; 80-155 Ipm (3774 only) 375 319
#4450 Forms Stand 62" 62"
#8700 Variable Width Forms Tractor (3774 only) 6 5
#58XX Print Belts 160" 160"
'Includes maintenance.
"Single use charge .•
© 1979 DATAPRO RESEARCH CORPORATION, DELRAN, NJ 08075 USA REPRODUCTION PROHIBITED
Monthly
~
Purchase Maint.
351 4.50
637 6.50
910 11.50 1.170 13.50
440 0.50
640 4.00
640 3.50
640 0.50
1,400 2.00 2.000 1.50
840 1.50
6,160 50.50 6,680 50.50 1,330 16.00 5,830 29.00 3,400 19.50 7,000 37.50 2,120 9.00 1,880 26.00 12,200 83.50
62
160 0.50
160
AUGUST 1979
C21-491-101 Programmable Tenninals
IBM 3774/3775 P Series Programmable Keyboard/Printer Terminals
An expanded 3775 Model PI is shown above. Included in this configuration are the 801 120 /pm printer and one diskette drive (left pedestal); a second drive could be added via a right pedestal mounting. Atop the terminal work surface is a 3501 5().cpm card reader. The 3521 50-cpm card punch is shown at the right of the photograph sitting on top of the 3782 Card Attachment Unit. which controls the punch.