LINE PRINTER OFF-LINE

Manual controls are provided that allow an operator to operate the Line Printer with the Card Reader and with a Tape Transport off-line. Using the manual

con-trols, the operator can list card information from the Card Reader or list tape information.

8.3.2.1 OPERATION WITH A TAPE TRANSPORT. To list a tape on the Line Printer, the operator must perform the following, figure 8-4:

a. Rotate the Tape Transport Selection switch to the OFF-LINE PRINTER position. This selects the Tape Transport f01" the Line Printer.

b. Rotate the Printer Unit Selection switch to the OFF-LINE TAPE position.

This selects the Line printer for the off-line Tape Transport.

c. Depres s the LogicRe set button located on the Tape Control Section of the Magnetic Tape Console Control Panel. This clears the tape control logic and places it in an Idle state.

d. Depress the Logic Reset button located on the Line Printer Control Section of Magnetic Tape Console Control Panel. This clears the Line Printer control log ic and place s it in an Idle state.

e. Position the tape using the manual Tape Position rotary switch.

f. Place the Tape Transport in the Automatic mode by depressing the Auto Mode button located on the Tape Control section of the Magnetic Tape Console Control PaneL This makes the Tape Transport ready to transmit data to the Line Printer.

g. Place the Line Printer on-line with the Tape Unit Transport, paragraph8.3.2.3.

h. Depress the List Tape or List File button located on the Line Printer Con-trol Section of the Magnetic Tape Console ConCon-trol Panel. Depressing either of these buttons causes the printing of data to be initiated. Depressing the List File.

button causes the printing of data from the tape until a file mark is detected.

Depressing the List Tape button causes the printing of data from the tape until an end of tape marker is detected. When an end of tape marker is detected, the Tape Transport will rewind automatically.

8.3.2.2 OPERATION WITH THE CARD READER/PUNCH .. To list cards on the Line Printer, perform the following:

Section VIn

Figure 8-4. Line Printer Control Panel

Se ction VIn

Paragraph 8.3. Z. 3

a. Rotate the Card Unit Selection switch to the OFF-LINE PRINTER position.

This selects the Card Reader/Punch for the Line Printer.

b. Rotate the Line Printer Selection switch to the OFF-LINE CARDS position.

c. Depress the Reader On buttons located on the Card Reader/Punch and the Card Control Section of the Magnetic Tape Console Control Panel.

d. Depress the Line Printer On button located on the Line Printer and place the Line Printer on-line with the Tape Transport.

e. Depress the Logic Reset button located on the Line Printer Control Section of the Magnetic Tape Console Control Panel. This action clears the Line Printer control logic.

f. Depress the Error Reset button located on the Card Control Section of the Magnetic Tape Console Control Panel. This clears the card control logic.

g. Depress the List Cards button located on the Line Printer Control Section of the Magnetic Tape Console Control Panel. This initiates the listing of cards that will continue until a card stacker is filled with cards, or all the cards have been printed, or a parity error has occurred. In a filled stacker condition, re-moving the cards will cause the printing of cards to be re-initiated. In an error condition, the operator must depress, in sequence, the Error Reset button for the card control logic, the Logic Reset button for the line printer control logic and the List Cards button to restart the printing of cards.

8.3. Z. 3 LINE PRINTER CONTROLS. To turn on the Line Printer, the operator must depress the On button on the Line Printer. In addition to this, the operator must depress the On-Line/Off-Line button on the Line Printer. This places the Line Printer on-line.

Seve ral controls are located on the Line Printer which enable the operator to position the paper in the Line Printer correctly. A Top of Form button advances the paper in the Line Printer until a Top of Form punch (channel Z) is detected in the control tape. A Load Paper button advances the paper one line at a time for ease of positioning of the paper, responding to punches in channell of the control tape.

A Test Print button on the Line Printer, when depressed, causes the Line Printer to print continuous rows of characters. This enables the operator to adjust the character phasing and penetration on the Line Printer. The character to be

Se ction VIII Paragraph 8.3.2.3 (Cont. )

printed is determined by the settings of the DSI-DS6 switches located on the back of the Line Printer. The character phasing and penetration controls are located respectively on the front and top of the Line Printer. A Form Position control on the front of the Line Printer allows the operator to position a printed line of infor-mation accurately on the printed lines of the paper being used.

Several indicators on the front of the Line Printer indicate a Line Printer hang -up condition.

A Paper Break indicator signals the operator that paper is not being fed through the Line Printer. A Paper Out indicator signals the operator that paper is not being fed into the Line Printer. A Throat Open indicator signals the operator that the sliding glass cover over the Line Printer is open. Both the Paper Break and Paper Out indicators, when activated, place the Line Printer off-line.

The Fast-Slow switch has no effect on Line Printer operation, except when printing with the Test Print button, in which case it selects test printing at 500 or 1000 lines per minute.

Section IX

SECTION IX

DISC MEMORY

The Disc Memory provides bulk storage of 124 megabits of data and provides real-time storage of one million bits of data for the Data Proces sing System. The Disc Memory is connected to the Central Processor via a trunkline that has provisions to accommodate a total of seven Disc Memories. Each Disc Memory is in turn equipped with provisions to accommodate seven Auxiliary Disc Memory consoles.

1£ required, the Disc Memory associated with a Central Processor may be

expanded to seven Disc Memories and forty-nine Auxiliary Disc Memories to pro-vide bulk storage of approximately s even billion bits of data.

Operationally, the Central Processor program, via the Disc Memory Interface in the Central Processor, addresses a Disc Memory and transmits prepare-file data to the Disc Memory. This operation may be in one of many modes, including storing and retrieving by fixed addres s, storing on available obsolete areas, retrieving by record content, obsoleting purged data or output to display. After being instructed for an operation, the Disc Memory operates simultaneously with the Central Processor, and data transfer to or from the Core Memory is on an interlace basis with the Cent,ral Proces s or program, until the transfer is complete.

When the transfer is complete, the Central Proces sor is notified via a Unit Not Busy Interrupt. Disc Memory to Central Processor and Central Processor to Disc Memory transfers are buffered through a high speed (400 nanoseconds cycle time) Core Buffer that provides storage for the key, mask and control information used to set up the search criteria on content retrieval operations.

Bulk/ auxiliary storage is arranged in 128 character block storage units ⁰ A block or mUltiples of a block can be key searched, transferred, obsoleted or counted.

The next addressable unit of information is a data-band which contains 1350 blocks.

Each of the two twins in a Disc Memory contains 60 data-bands. Each Disc Mem-ory contains six discs, three discs per twin. These twins may be operated in re-dundant mode (write and read the same data in parallel) or in separate mode, at program option. Error checking is performed on all Disc Memory operations and

data transfers to protect stored data and provide an error alarm.

Section IX

Paragraphs 9.1 to 9. 1. 3

Real-tillle storage capacity of a Disc Melllory is approxilllately one lllillion bits of data. Data for display on the Display Consoles is translllitted by the Central Proces sor to the Disc Melllory in the sallle lllanner as all other data.. The data forlllat is changed in the Disc Melllory to conforlll to the requirelllents of the respective display interface.

The twin feature allows cOlllplete duplexing by allowing, at progralll option, the sallle data to be written into both Twins. Silllilarly, the data lllay be read in dual, and a detected error in one Twin or a difference between the Twins, will be indi-cated to the Central Processor. If dual operation is not desired, either Twin may be operated in a single lllode and addressed as a single unit at progralll option.