Radio Shack CT-502 owner manual Charging the Battery

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To remove the battery, be sure the phone is turned off, then press the latch at the top of the battery and slide the battery toward the bottom of the phone until it stops. Then lift the bat- tery off the phone.

Note: If you have an extra charged battery and the currently installed battery becomes low during a call, you can change the battery without ending the call or losing the connection. See “Replacing a Battery During a Call” on Page 12.

CHARGING THE BATTERY

The nickel metal-hydride (NiMH) battery supplied with your telephone is shipped in a discharged state to extend the bat- tery’s life. It must be fully charged before you can use your phone.

We recommend that you charge a new battery overnight, but no longer than 24 hours, using the AC charger supplied with your phone. Recharging time for the supplied battery is about 3 hours, although the time varies based on the amount of charge left in the battery. For the recharging time of any other battery type, see the instructions provided with that battery.

Follow these steps to charge the supplied (or any approved) battery using the charger supplied with your phone.

1.Install the battery on the phone.

2.Insert the charger’s flat plug into the charging jack on the bottom of the phone.

Note: The plug fits into the jack only one way. If you have difficulty inserting the plug, turn it over and try again. Do not force it!

3.Plug the charger’s power cord into a standard AC outlet.

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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 Troubleshooting Safety Information Other FeaturesResetting the Phone Care and Maintenance SpecificationsLook AT Your Phone Earpiece Status IndicatorsRetractable Antenna InUse Indicator Reading the Status IndicatorsPower/Lock Indicator Flip Cover Volume ControlsRoam Indicator NoSvc No Service IndicatorReading the Display Using the Battery Installing 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 Ringer Volume Adjusting the VolumeAdjusting the Earpiece Volume Using MuteMaking Emergency Calls Important NotesUsing 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 Emergcy Call Auto LockTurbo Dial Number PrefTurning the Signal Strength Meter Off/On Using the Menu FunctionsTurning the Call-Time Reminder Tone Off/On Turning the Automatic Call Timer On/Off Using Silent ScratchpadChanging the Ringer Style Changing the Alert Type Turning the Keypad Tones Off/On Using Automatic Answer Using Multiple Key Answer Turning One-Touch Dialing Off/OnTurning the Emergency Display Off/On Turning the Number Display Preference Off/OnUsing Call Screening Turning the Message Reminder Tones Off/On Using Memory Storing Speed Dial NumbersFm Page 37 Wednesday, July 21, 1999 223 PM Storing Speed Dial Numbers in Blocks Block Number Includes Memory LocationsONE-TOUCH Dialing Speed RECALL/DIALINGMemory SCROLLING/DIALING Scrolling by Name Alphabetical OrderScrolling by Memory Location Number Scrolling While a Call is in ProgressChanging Information in a Memory Location Clearing a Memory Memory Dialing Tips Using Scratchpad MemoryBanking or Other Phone Services Frequently Dialed Area Codes/PrefixesUsing Manual Lock Security FeaturesLocking Your Phone Using Automatic Lock Changing the Lock CodeDisplaying the Lock Code Using Service Restrictions Service Description LevelFm Page 49 Wednesday, July 21, 1999 223 PM Overview/Receiving Messages Other FeaturesUsing the Messaging Functions You See MeaningViewing/Recalling Messages Using the Phone with Handsfree Equipment Deleting MessagesUsing the Call Timers Displaying the Individual Call TimerUsing the Resettable Call Timer Displaying the Cumulative Call TimerSelecting the Active Phone Number Phone Cellular System Type Display Shows NumberSetting the Cellular System Type Std AB Displaying the Currently Selected System Type Selecting the Cellular System TypeUsing Cellular System PIN Dialing RoamingMaking a Call Using Your PIN Enabling/Disabling PIN DialingUsing TOUCH-TONE Services Adding a PauseCalling Card Dialing Storing a Calling Card SequencePlacing a Call Using a Stored Calling Card Sequence Resetting the Phone Using Master ResetUsing 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 Specifications Patent InformationFm Page 72 Wednesday, July 21, 1999 223 PM Display Message Glossary Stored Emergcy Call Indiv TimerNoNames FullScan AB Std SettingScan a Scan BRadioShack Division of Tandy Corporation

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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