Radio Shack CT-502 owner manual Specifications, Patent Information

Page 71

17-1111.fm Page 71 Wednesday, July 21, 1999 2:23 PM

SPECIFICATIONS

Dimensions:

55/8 × 23/8 × 13/8 Inches

Weight (with Supplied Battery):

7.7 oz

 

(218 g)

Transmitting Power:

0.6W + 2dB – 4dB

Operating Voltage:

µ5.2–7.5 DC

Internal battery:

6.0V DC

Input to AC charger:

110V AC

Frequency Band:

824–849 MHz (TX)

 

869–894 MHz (RX)

Specifications are typical; individual units might vary. Specifi- cations are subject to change and improvement without no- tice.

PATENT INFORMATION

This phone is manufactured under one or more of the follow- ing U.S. patents.

4121218

4617520

D295975

4965537

D327061

5261119

4124879

D286778

4751737

4972355

5128834

5262710

4127824

4626309

D296187

4972432

D328302

5263052

4128740

4628529

4761621

4972455

5142551

5276707

4138681

4629829

4764737

4975808

5142696

5278994

4193036

4630304

D297734

4984290

5146620

D343173

4254382

4630305

D297735

D314173

5148471

5280637

4302845

4633141

4777564

D315330

5148473

D344087

4312074

4636593

Re32768

D315346

5148961

5287553

4327319

4636741

D299136

D315543

5150359

5287555

4329666

D288432

4797929

D315559

5150384

5287556

4369516

4648125

4798975

D315565

5152006

D344511

4369522

4649543

4800348

5004992

5157693

5301365

4378603

D288683

4802236

D315907

5163159

5321847

4390963

4654655

4809356

5008925

5164652

D348880

D269873

D289156

4811377

D316417

5166596

5349588

4389265

4662691

4811404

D316859

5175759

5359696

4400584

4667333

4827226

5017856

5175874

5361400

71

Image 71
Contents CT-502 Flip-Style Handheld Cellular Telephone Features Fm Page 3 Wednesday, July 21, 1999 223 PM Table of Contents Care and Maintenance Specifications Other FeaturesResetting the Phone Troubleshooting Safety InformationRetractable Antenna Earpiece Status IndicatorsLook AT Your Phone Flip Cover Volume Controls Reading the Status IndicatorsPower/Lock Indicator InUse IndicatorReading the Display NoSvc No Service IndicatorRoam Indicator Installing the Battery Using the BatteryCharging the Battery Checking Battery Power Replacing a Battery During a Call Important Battery Tips Turning the Phone ON/OFF Signal STRENGTH/SERVICE AreaBasic Operation Making a Call Tone Display Shows Description Answering a CallSystem Busy Message Missed Call Message Using Mute Adjusting the VolumeAdjusting the Earpiece Volume Adjusting the Ringer VolumeImportant Notes Making Emergency CallsRedialing Numbers Using Last Ten Number RedialUsing Automatic Redial Number Longer than Seven Digits Displaying NumbersYour Phone Number Turning a Function On/Off Menu FunctionsOverview Function Status Quick-Review Menu Functions List Number Pref Auto LockTurbo Dial Emergcy CallTurning the Call-Time Reminder Tone Off/On Using the Menu FunctionsTurning the Signal Strength Meter Off/On Using Silent Scratchpad Turning the Automatic Call Timer On/OffChanging the Ringer Style Changing the Alert Type Turning the Keypad Tones Off/On Using Automatic Answer Turning One-Touch Dialing Off/On Using Multiple Key AnswerTurning the Number Display Preference Off/On Turning the Emergency Display Off/OnUsing Call Screening Turning the Message Reminder Tones Off/On Storing Speed Dial Numbers Using MemoryFm Page 37 Wednesday, July 21, 1999 223 PM Block Number Includes Memory Locations Storing Speed Dial Numbers in BlocksSpeed RECALL/DIALING ONE-TOUCH DialingScrolling by Name Alphabetical Order Memory SCROLLING/DIALINGScrolling While a Call is in Progress Scrolling by Memory Location NumberChanging Information in a Memory Location Clearing a Memory Frequently Dialed Area Codes/Prefixes Using Scratchpad MemoryBanking or Other Phone Services Memory Dialing TipsLocking Your Phone Security FeaturesUsing Manual Lock Changing the Lock Code Using Automatic LockDisplaying the Lock Code Service Description Level Using Service RestrictionsFm Page 49 Wednesday, July 21, 1999 223 PM You See Meaning Other FeaturesUsing the Messaging Functions Overview/Receiving MessagesViewing/Recalling Messages Deleting Messages Using the Phone with Handsfree EquipmentDisplaying the Individual Call Timer Using the Call TimersDisplaying the Cumulative Call Timer Using the Resettable Call TimerPhone Cellular System Type Display Shows Number Selecting the Active Phone NumberSetting the Cellular System Type Std AB Selecting the Cellular System Type Displaying the Currently Selected System TypeRoaming Using Cellular System PIN DialingEnabling/Disabling PIN Dialing Making a Call Using Your PINAdding a Pause Using TOUCH-TONE ServicesStoring a Calling Card Sequence Calling Card DialingPlacing a Call Using a Stored Calling Card Sequence Using Master Reset Resetting the PhoneUsing Master Clear If the power comes on, but the phone does not work TroubleshootingIf the phone’s power does not come on or stay on Operating Environment Safety InformationTraffic Safety Emergency Calls FCC Regulations Care and Maintenance Patent Information SpecificationsFm Page 72 Wednesday, July 21, 1999 223 PM Display Message Glossary Full Indiv TimerNoNames Stored Emergcy CallScan B Std SettingScan a Scan ABDivision of Tandy Corporation RadioShack

CT-502 specifications

The Radio Shack CT-502 is a remarkable device that stands out in the world of vintage technology, particularly known for its versatility and functionality as a portable computer. Launched during a time when personal computing was rapidly evolving, the CT-502 embodies the spirit of innovation that characterized the early days of computing technology.

At its core, the Radio Shack CT-502 comes equipped with a Zilog Z80 microprocessor, a staple of many early personal computers that provided solid performance for its time. This CPU offers an 8-bit architecture with a clock speed of 2.5 MHz, allowing users to execute tasks efficiently. The CT-502 features a memory capacity of 64 KB of RAM, which can be expanded, making it suitable for various applications, from basic text processing to simple programming tasks.

One of the standout features of the CT-502 is its dual built-in floppy disk drives, which enable users to easily load and save data. This was particularly advantageous during the era when storage solutions were evolving, as it allowed for quick access to programs and files. The 5.25-inch floppy disks used by the CT-502 became a standard for many personal computing applications, ensuring wide compatibility with software.

The device also features a compact, built-in keyboard that boasts a full set of function keys, essential for efficient data entry and navigation. Complementing the keyboard is a 40-character by 24-line monochrome display, which provides a clear view of text and applications, ideal for programming and document creation.

In terms of connectivity, the CT-502 includes a variety of ports such as serial and parallel interfaces, allowing users to connect external devices like printers and modems. This functionality enhanced the versatility of the system and integrated it into the growing network of computers.

Moreover, the Radio Shack CT-502 runs on the TRS-DOS operating system, designed specifically for the TRS line of computers. This operating system was user-friendly for its time, enabling users to manage files and perform various tasks without deep technical knowledge.

In summary, the Radio Shack CT-502 represents a significant milestone in early computing history, offering a combination of portability, ease of use, and expansion capabilities. With its reliable hardware, user-friendly interface, and diverse connectivity options, it remains a fondly remembered piece of technology that paved the way for modern personal computers.