Tandy WP-2 Manual de usuario

TANDY9

Service

Tandy WP-2

Portable Wordprocessor

Catalog Number: 26-3930

SPECIFICATIONS

Microprocessor

Clock Speed

Memory

Keyboard

Display

Externa] Connections

Battery

AC Adapter

Power Consumption

(ai 6VDC)

NEC 70008A-6(Z80 type)

5.5296 MHz

256 KByte Standard ROM (BIOS, WORDPROCESSOR, and speli check), 32 KByte Standard RAM

(VRAM and Free Area)

ROM: Option (IC Card) Expandable up to 256 Kbyte

RAM: Option (RAM chip) Expandable 32 Kbyte or 128 Kbyte (RAM Disk)

Option (IC Card) Expandable 32 Kbyte, 64 Kbyte, 128 Kbyte (IC Card)

Full-size 62 keys.

"Supertwist" LCD, 480 X64 pixels, 8 X80 characters

AC Adapter

DB-25 Parallel Printer

DB-9 Serial Port

DIN-8 Cassette Tape

IC Card-38 Memory Card

AA size battery X4, Alkaline or Ni-Cd

6VDC 400 mA, UL listed (Cat. No. 26-3804)

UNIT NORMAL LIMIT

mA 80-90 140

Radio Shack and Tandy are registered trademarks of Tandy Corporation.

CONTENTS

Section ISYSTEM OVERVIEW .. 1-1

1-1 External View 1-1

I-2 Internal View.. 1-4

I-3 Specifications 1-6

Section II DISASSEMBLY INSTRUCTIONS 2-1

11-1 Top Case 2-1

II-2 Keyboard 2-3

II-3 LCD 2-4

II-4 Main PCB 2-4

II-5 Sub PCB 2-6

Section III MAINTENANCE 3-1

lll-l Clean the Case and LCD Display 3-1

Section IV Theory of Operation 4-1

IV-1 Hardware Specifications 4-1

IV-2 Description of Block Diagram 4-4

IV-3 CPU 4-4

IV-4 Memory Map 4-5

IV-5 Main RAM Control Circuit 4-5

IV-6 Expansion RAM Control Circuit 4-6

IV-7 ROM Control Circuit 4-6

IV-8 I/O Address Map 4-7

IV-9 Interrupt 4-9

IV-10 Keyboard 4-9

IV-1 1Cassette Interface Circuit 4-10

IV-1 2Printer Interface Circuit 4-11

IV-1 3Serial Interface Circuit 4-12

IV-1 4Buzzer Control Circuit 4-13

IV-1 5LCD Controller 4-13

IV-1 6Power Supply 4-14

IV-1 7Software Calls 4-1

IV-1 8Software and Hardware Memory Map 4-17

IV-19 IC Card 4-20

Section VTROUBLESHOOTING 5-1

Section VI EXPLODED VIEW/PARTS LIST 6-1

VI-1 Exploded View 6-1

VI-2 Electrical Parts List 6-2

Main PCB Assembly 6-2

LCD Unit 6-6

Mechanical and Assembly Parts 6-7

Keyboard Unit 6-8

Section VII PCB VIEWS 7-1

VII-1 Main PCB Top View 7-1

VM-2 Main PCB Bottom View 7-2

VII-3 LCD PCB View 7-3

Section VIM CIRCUIT DIAGRAMS 8-1

VIII-1 Main PCB Circuit Diagrams -8-1

APPENDICES

Appendix A. LCD SPECIFICATIONS A-1

1. Application A-1

2. Composition A-1

3. Mechanical Specifications A-2

4. Electrical Specifications -A-3

5. Interface Specifications A-5

6. Optical Characteristics..... A-9

7. Precautions in Use A-1

8. LCD Module View A-1

Appendix B. INSTALLATION OF OPTIONAL RAM B-1

Appendix C. KEYBOARD LAYOUT, CONNECTER PIN ASSIGNMENTS,

AND CHARACTER CODE TABLES. C-1

Keyboard Layout C-1

2. Connector Pin Assignments C-2

3. Character Code Tables C-5

Appendix D. ROM CALLS AND SPELLER INFORMATION D-1

1. ROM Calls D-1

2. Speller Information D-1

List of Illustrations

Table Page

Number DESCRIPTION Number

1-1 Front View 1-1

1-2 Rear View 1-2

1-3 Bottom View 1-3

1-4 Main PCB 1-4

1-5 LCD PCB 1-5

2-1 DSUB Connector Screw Removal 2-1

2-2 Removal of Main Batteries 2-1

2-3 Top Case Removal ,2-2

2-4 LCD Cable Removal 2-2

2-5 Keyboard Removal 2-3

2-6 LCD Removal 2-4

2-7 Main PCB Removal 2-5

2-8 Back-up Battery Cover and Back-up Battery Removal 2-6

2-9 Lower Case View 2-6

4-1 Block Diagram ,4-3

4-2 Memory Map 4.5

4-3 Main RAM Control Circuit 4-5

4-4 Expansion RAM Control Circuit 4-6

4-5 ROM Control Circuit 4-6

4-6 Interrupt Control 4-9

4-7 Keyboard Control ,4-9

4-8 Cassette Interface Circuit 4-10

4-9 Printer Interface Circuit ,4.11

4-10 Serial Interface 4-12

4-1

Buzzer Control Circuit 4-1

4-12 LCD Controller ,4-13

4-13 Power Supply 4-14

4-14 Power Supply Circuit 4-15

6-1 Exploded Vrew 6-1

7-1 Main PCB Top View 7-1

7-2 Main PCB Bottom View 7-2

7-3 LCD PCB View 7-3

A-1 Block Diagram A-1

A-2 Dot Dimensional Drawing A-2

A-3 Vo Adjusting Circuit ,A-4

A-4 LCD Screen A-5

A-5 Timing Chart A-6

A-6 Timing Chart a-8

A-7 Timing Chart A-8

A-8 Optical Characteristics Measurement System A-9

A-9 Definition of Response Time A-9

A-10 Definition of 8and <b A-10

A-11 Definition of Contrast Ratio A-10

A-1

Operational Precautions A-1

A-1

LCD Module A-13

B-1 RAM Insertion B-1

C-1 Keyboard ,C-1

C-2 Keyboard ,C-1

C-3 RS-232C Connector ,C-4

C-4 Cassette Connector ,,C-4

C-5 Printer Connector C-4

C-6 External Card Connector ,C-4

List of Tables

Table Page

Number DESCRIPTION Number

C-1 RS-232C Interface C-2

C-2 Cassette Interface C-2

C-3 Printer Interface C-2

C-4 Expansion Card Interface ,C-3

C-5 Character Code Table C-5

C-6 ESC Sequence Code (VT52) C-11

I. SYSTEM OVERVIEW

This manual has been prepared for Tandy technicians working in the field or in repair centers. Users of this manual

should be acquainted with the ^PD70008A-6 microprocessor and the 82C51 UART.

The Tandy WP-2 has the following applications programs in the standard ROM: TEXT, TELCOM, PHONE(AD-

DRESS), CALENDAR(SCHEDULE), SPELLCHECK, and FILES.

1-1. External View

1. Keyboard: Can be used like astandard typewriter. However, the Tandy WP-2 does have afew special keys, (See

Appendix Cof this manual for more details.)

2. LCD Screen: The Tandy WP-2 display is eight lines by 80 characters.

3. Power Switch: Pressing this switch turns the power on and off. To conserve the batteries, the Tandy WP-2

automatically turns the power off if you do not use it for 10 minutes in the default setting.

4. CONTRAST control: This control adjusts the contrast of the LCD display.

5. PROTECT Switch: This switch is used to prevent discharge of the Lithium battery, used for RAM back up. The

Tandy WP-2 operates only when the power switch is set to ON. Set this switch to the OFF position when the Tandy

WP-2 will not be used for along period of time. Note that the RAM is not backed up when this switch is set to

the OFF position, and all information RAM in will be lost.

LCD Screen

1.Keyboard

3. Power Switch

5. Protection Switch

4. Contrast Control

Figure 1-1. Front View

i-i

1. Expansion Card (IC Memory) Slol: Insert the IC memory card into this slot. The connector in the slot is connected

to the system bus of the CPU.

2. Serial Interface Connector (RS232C): Attach aDB-9 cable (such as Radio Shack Catalog Number 26-265) to this

connector when you need to receive or transmit serial information. This connector is also used for the FDD.

3. Printer Interface Connector: For hard-copy printouts of information, attach any Radio Shack parallel printer to this

connector, using an optional/extra printer cable.

4. Cassette Interface Connector: To save or load information on acassette tape, connect the cassette recorder here.

An optional/extra cassette recorder cable is required.

5. AC Adapter Jack: Connect the appropriate end of Radio Shack's AC adapter {Catalog Number 26-3804, optional/

extra) to this connector. Connect the other end of the AC adapter to astandard AC wall-outlet or approved power

strip.

3. Printer Interface Connector

4. Cassette Interface Connector

©Seriaf Interface Connector (RS232C)

©Expansion Card Slot

5. AC Adapter Jack

Figure 1-2. Rear View

1-2

1. Main Battery Compartment: When an AC adapter is not connected, the Tandy WP-2 gets its power from four AA

size batteries installed in this compartment.

2. Back-up Battery Compartment: The Tandy WP-2 gets RAM back-up power from aLithium battery (CR-2430)

installed in this compartment.

3. RESET Button Hole: If the Tandy WP-2 locks up (i.e., the display "freezes" and all keys seem to be inoperative),

push this button; the display returns to the Main menu (siari-up). All data stored in RAM will be lost when you

press RESET. It is not likely that the Tandy WP-2 will lock up when you are using the built-in applications programs.

However, it might occur with customized programs.

4. Stands: Pull down to make the WP-2 sit at an angle.

©Main Battery Compartment ©Back-up Battery Compartment

«O

^R^!-,l:^KM :] N-:UI. :.la.|

ifeVaH&KT.jq

SJAL

33!

(=^~

o©

O©

(S) Reset Button

©Stands

Figure 1-3. Bottom View

1-3

1-2. Internal View

Optional RAM Compartment: An optional RAM can be inserted into this compartment to enhance the Tandy WP-2

capabilities.

The Tandy WP-2 consists of four printed circuit boards:

*LCD PCB

*Keyboard PCB

*Main PCB

*Sub PCB

Figure 1-4. Main PCB (Bottom View and Top View)

[-4

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