Radio Shack CT-502 owner manual Important Battery Tips

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17-1111.fm Page 13 Wednesday, July 21, 1999 2:23 PM

IMPORTANT BATTERY TIPS

•Use only the supplied charger and use only batteries designed for this phone.

•You can purchase additional standard or extended capacity batteries through your local RadioShack store.

•When you are not using the charger, disconnect it from power. Do not leave the battery connected to the charger for more than 24 hours, since overcharging could shorten the battery’s life.

•When the battery is not in use, store it uncharged in a cool and dark place.

•The battery is a sealed unit with no serviceable parts. Do not try to open the case.

•For the best results, be sure the battery is at or near room temperature when you charge it.

•A battery can be charged and discharged hundreds of times, but it eventually wears out. When the operating time (talk time and standby time) is noticeably shorter than normal, get a new battery and recycle or properly dispose of the old one.

•Do not dispose of batteries in a fire.

•Never use any charger or battery that is damaged or worn out.

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Contents CT-502 Flip-Style Handheld Cellular Telephone Features Fm Page 3 Wednesday, July 21, 1999 223 PM Table of Contents Resetting the Phone Other FeaturesTroubleshooting Safety Information Care and Maintenance SpecificationsLook AT Your Phone Earpiece Status IndicatorsRetractable Antenna Power/Lock Indicator Reading the Status IndicatorsInUse Indicator Flip Cover Volume ControlsRoam Indicator NoSvc No Service IndicatorReading the Display Installing the Battery Using the BatteryCharging the Battery Checking Battery Power Replacing a Battery During a Call Important Battery Tips Basic Operation Signal STRENGTH/SERVICE AreaTurning the Phone ON/OFF Making a Call System Busy Message Answering a CallTone Display Shows Description Missed Call Message Adjusting the Earpiece Volume Adjusting the VolumeAdjusting the Ringer Volume Using MuteImportant Notes Making Emergency CallsUsing Automatic Redial Using Last Ten Number RedialRedialing Numbers Your Phone Number Displaying NumbersNumber Longer than Seven Digits Overview Menu FunctionsTurning a Function On/Off Function Status Quick-Review Menu Functions List Turbo Dial Auto LockEmergcy Call Number PrefTurning the Signal Strength Meter Off/On Using the Menu FunctionsTurning the Call-Time Reminder Tone 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 Banking or Other Phone Services Using Scratchpad MemoryMemory Dialing Tips Frequently Dialed Area Codes/PrefixesUsing Manual Lock Security FeaturesLocking Your Phone Changing the Lock Code Using Automatic LockDisplaying the Lock Code Service Description Level Using Service RestrictionsFm Page 49 Wednesday, July 21, 1999 223 PM Using the Messaging Functions Other FeaturesOverview/Receiving Messages You See MeaningViewing/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 phone’s power does not come on or stay on TroubleshootingIf the power comes on, but the phone does not work Traffic Safety Safety InformationOperating Environment Emergency Calls FCC Regulations Care and Maintenance Patent Information SpecificationsFm Page 72 Wednesday, July 21, 1999 223 PM Display Message Glossary NoNames Indiv TimerStored Emergcy Call FullScan a Std SettingScan AB Scan BDivision 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.
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