Radio Shack CT-502 owner manual Using Master Clear

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17-1111.fm Page 65 Wednesday, July 21, 1999 2:23 PM

USING MASTER CLEAR

Master clear lets you enter the preset security code (000000) to do the following:

•Reset all of the phone’s special functions to their default settings (see “Menu Functions List” on Page 24)

•Delete all information stored in memory

•Clear the resettable call timer

Follow these steps to perform master clear.

Caution: Performing master clear deletes all information stored in memory.

1. Press FCN OPER 0 .

2. Enter the 6-digit security code twice.

3. To clear the phone, press WXY9 STO .

When the phone finishes resetting (when Busy disap- pears, for example), you can use it as usual.

Note: Depending on your phone’s settings and the amount of information stored in memory, Busy might appear, the phone might sound a continuous beep, and it might take several minutes to finish clearing.

To exit without performing master clear, press END.

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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 SpecificationsRetractable Antenna Earpiece Status IndicatorsLook AT Your Phone Power/Lock Indicator Reading the Status IndicatorsInUse Indicator Flip Cover Volume ControlsReading 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 Adjusting the Earpiece Volume Adjusting the VolumeAdjusting the Ringer Volume Using MuteImportant 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 Turbo Dial Auto LockEmergcy Call Number PrefTurning 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 Banking or Other Phone Services Using Scratchpad MemoryMemory Dialing Tips Frequently Dialed Area Codes/PrefixesLocking 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 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 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 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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