Line Cord

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(

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POWER

The 5110 operates with any of the following five single-phase AC power sources:

• 60 Hz - 100 Vac - 115 Vac

• 50 Hz - 100 Vac - 220 Vac - 235 Vac

D

Line Filter (L 1)

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AC Capacitors (Cl, C2)

II

Fuse (F1)

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^{Line Cord}

AC Power Box

AC power enters the 5110 through a line cord

a

^that

attaches to the filter

D

in the AC power box. The AC power box also contains the AC capacitors

II

^{and the}

F1 fuse holder

B.

The power on/off switch controls the distribution of AC power.

Internal Operation of the 5110 341

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Power Supply PC Board

The PC board uses a small, high power, high frequency transistor switching regulator (TSR) supply to develop five DC voltages for the 5110 system:

+5 Vdc -5 Vdc

Basic logic voltage

Tape control card, storage cards, BSCA cards, and common ROS +8.5 Vdc Storage cards, keyboard, display

adapter, printer adapter, BSCA cards, and all ROS cards

+12 Vdc Display unit, tape select magnets, tape LEDs, BSCA cards, and 5114 R1 relay

-12 Vdc Tape unit, 5114 R1 relay, BSCA cards, and asynchronous communi-cations/serial I/O card

The DC outputs may vary from +10% to -9% of the rated voltage before they affect the operation of the system.

DC Power Distribution

The five voltages supplied to the attached I/O devices are distributed through the interface port of the 5110 through the power cable of the attached device. All I/O devices, except the 5103, also have an interface port to which the next device is attached in serial fashion. The 5106, the 5114, and the 5103 each have an I/O cable assembly that includes a power connector plug (A 1).

The voltage ground is distributed through the I/O cable signal connectors (A2, A3) of the I/O cable.

The +5 Vdc supplied to the 5114 is not used by the 5114 nor is it distributed to any devices attached to the 5114. The 5114 develops its own +5 Vdc and supplies this voltage through the A 1 connector to any devices that are attached.

Power Supply Protection

The 5110 power supply has built-in overvoltage, undervoltage, and overcurrent protection. The overvoltage protection shuts down the power supply when the +12 Vdc output exceeds +16 Vdc. The undervoltage. protection shuts down the power supply when the -5 Vdc is less than -3 Vdc. The overcurrent protection automatically shuts down the power supply when the current in the primary of the transformer is excessive. Any time that the power supply automatically shuts down the 5110, the computing system should be powered down with the on / off switch for at least five seconds before it is powered up again.

Reference Voltage

A +6 Vdc controlled voltage is provided on the display card (G2) as a reference in critical voltage

measurements.

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5110 Operations

POWER ON PROCEDURE, INITIALIZATION, AND BRING-UP DIAGNOSTIC

When the 5110 is powered up or when the restart switch is pressed, executable ROS provides the processor with the instructions of the bring-up diagnostic. Before the user enters any programs or data, the processor executes these instructions to determine if the 5110 is operating correctly. If a failure is detected during the bring-up diagnostic, the 5110 will stop with a bring-up halt or a process check. If LOADO or CLEAR WS appears on the bottom line of the display, the bring-up routine and the IPL have run successfully.

Upon completion of the bring-up diagnostic, the processor starts to execute the initial program load (lPL)

I

routine, beginning at address OOOA in executable ROS.

The language in which the 5110 will be operated is selected when the routine examines the status of the APL/BASIC switch on the console.

The processor next executes an I/O microprogram that flashes the cursor on the display screen. The program then waits for a keyboard interrupt indicating the entry of a program or instruction.

I/O OPERATION AND DATA TRANSFER FROM KEYBOARD TO DISPLAY AND PRINTER

The following program illustrates how the processor interprets input through the execution of microprograms and controls the execution of a BASIC program. keyboard, the processor executes an I/O microprogram that flashes the cursor and waits for a keyboard processor begins operating at level 3.

3. The interrupt causes the I/O microprogram to stop the flashing of the cursor and to pass control to the keyboard I/O microprogram.

4. The level 3 microprogram transfers the key code to a register in the processor through the 'data bus in'line.

The keyboard I/O microprogram converts the key code to 5110 internal code by using the translation table in common ROS. The microprogram transfers the trans-lated characters to hex OOBO in read/write storage, the interrupt is reset, and control is returned to the I/O microprogram.

The I/O microprogram checks the internal code to deter-mine if the key that was pressed was a data key or a func-tion key. If a data key was pressed, the internal code is moved to the read/write storage buffer area. The display adapter then transfers the internal code for the key from the buffer area to the display adapter through the 'read data bus' line, using the cycle steal data transfer controls.

The data is decoded, using the ROS on the display card to select the correct character dot pattern. The selected dot pattern is put on the 'machine video' line to the dis-play unit and the I/O microprogram resumes flashing the cursor and waits for the next keyboard interrupt.

When the EXECUTE key is pressed at the end of a BASIC microprogram in executable ROS.

5110 Operations 343

The processor begins to execute the BASIC

microprograms and calls out microprograms that are located in BASIC ROS. This BASIC ROS microprogram checks the statement in the display screen buffer and stores the statement in the user area of read/write storage. Each statement is stored in the same manner until a RUN statement is encountered by the BASIC interpreter; at this time, all of the statements are interpreted and executed. (If this had been a calculator statement, each statement would have been interpreted and executed as it was entered.)

When the PRINT FLP,C statement is interpreted, the interpreter places information in the input/output control block (lOCB) of read/write storage for the print

operation and passes control to the I/O microprogram.

The I/O supervisor microprogram checks the device address and passes control to the printer I/O microprogram.

The printer I/O microprogram transfers the data to the printer, which prints the data, places a return code in the 10CB, and returns control to the I/O microprogram.

(The data flow is from the print buffer in read/write storage to the printer through the processor, the base I/O adapter, the I/O cable driver, and the printer adapter.)

The BASIC microprogram determines that there are no more statements to be interpreted and returns control to the I/O microprogram. The I/O microprogram flashes the cursor and waits for a keyboard interrupt.

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^Contents

DIAGNOSTIC AIDS 4·2 I/O CONTROL INFORMATION (lOC) 4-92

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5110 Diagnostics Overview. 4·2 Device Address 4·92

5110 Diagnostics Overview Chart. 4·3 I/O Command 4-93

Bring Up Diagnostic. 4-6 ERROR CODES. 4-94

Bring Up Diagnostic Chart . 4·7 Error Codes and Device Address Summary 4·95

Diagnostic Control Program (DCP) 4-8 Tape Error Codes 4·96

DCP Normal Mode 4-9 Diskette Error Codes 4·97

Display 4·10 5103 Printer Error Codes 4·103

Alter 4·11 Print Emitter Error Timing (Nominal Timings) 4·106

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DCP Diagnostic Mode 4·12 Serial I/O Error Codes 4·107

Branch Function. 4·13 BRING·UP DIAGNOSTIC HALT CODES 4·109

Call Function 4·15 ROS Content and CRC Errors . 4·111

Diagnostic Diskette Volume Label 4·26 Parallel I/O Error Codes 4·112

Diagnostic Supervisor Program (DSP) • 4·27 Binary Synchronous Communications (BSC) Error

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MAP Diagnostic Integration (MOil 4·29 Log and History Table. 4·113

Tape Write Diagnostic Routines 440 5110 Symptom Index 4·114

5103 Printer Diagnostic Routines. 446 5110 Service Tips 4·117

Tape Read Test and Auxiliary Tape Diagnostic Routines 4·50 General Tips . 4·117

Diskette Diagnostic Routines 4·55 Tape File Recovery 4·117

Asynchronous Communications Adapter/Serial I/O Error Retry Bypass 4·118

Adapter Program and Diagnostic Routines 4·57 Tape Mark 4·118

BSC Diagnostic Routines 4-62 Freelance Aids 4·118

Parallel I/O Diagnostic Routines 4-63 Card and Board Jumpers 4·119

SERVICE AIDS. 4-64 Read/Write Head (007) Errors . 4·119

Error Indicators . 4-64 Intermittent Process Checks 4·119

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CE Switches . 4-64 Dropping Records 4·119

Jumpers 4-64 Attachment of a TV Monitor 4·120

Machine Check Jumper. 4-64 MOl Failure Isolation Charts 4·121

Basic Language Jumper. 4-64 MDl800-Printer 4·121

Katakana Check Jumper 4-64 MOl 820-Async Comm/Seriall/O 4·122

Logic Card Jumpers . 4-65 MOl 821-Binary Synchronous Communications

Display Registers 4-65 Adapter (BSCA) 4·122

Read/Write Storage Size 4-66 MOl 823-Parallel I/O 4·122

Status Bytes . 4-67 MOl 840-Tape Read 4·123

Tape Status Byte 4-67 MOl 860-Tape Write 4·124

Printer Status Bytes. 4-67 MOl 881-Diskette Drive 4·125

Diskette Status Byte 4-68 MOl 890-Communications Routines. 4·126

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Status Byte Bit Descriptions 4-69

Tape Status Byte 4-69

Printer Status Bytes. 4-69

Diskette Status Bytes 4-69

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Binary Synchronous Communications (BSC) Error Log

and History Table • 4·70

Errors. 4·70

Print Plot Forms Movement Exerciser Program 4·71

Print Plot Error Chart 4·72

Teleprocessing Diagnostic Analyzer Tester 4·73

FREE LANCE TROUBLESHOOTING GUIDE 4·74

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How to Use This Guide. 4·74

Recommendations on Failure Information 4·74

Failure Isolation Chart . 4·75

Intermittent Process Check. 4·76

Tape 4·76

AC Power Grounding Checks 4·76

5110 SYSTEM FUNCTION TEST 4-80

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System Function Test Overview 4-81

System Test 4-84

Device Exercisers 4-86

Contents 4-1

Im Dokument IBM 5110 Computer (Seite 119-124)