Radio Shack CT-502 owner manual Reading the Display, NoSvc No Service Indicator, Roam Indicator

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NoSvc (No Service) Indicator

Flashes or lights steadily if the phone is beyond the range of the cellular service area, meaning calls cannot be made or re- ceived. See “Signal Strength/Ser- vice Area” on Page 14.

Roam Indicator

Flashes or lights steadily if the phone is accessing a service area outside of your home sys- tem (roaming). See “Roaming” on Page 59.

READING THE DISPLAY

Your phone’s display provides a full range of messages and indicators to assist you with the phone’s operation. Since many of these messages contain more characters than your phone can display at one time, the phone displays most mes- sages across more than one display. For example, the phone displays Signal then (within about 1 second) Mtr On to in- dicate that the signal meter display feature is turned on.

Note: When referring to a displayed message, this manual in- cludes the entire message (such as Signal Mtr On).

For a complete listing of display messages and indicators, see “Display Message Glossary” on Page 73.

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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 Other Features Resetting the PhoneTroubleshooting Safety Information Care and Maintenance SpecificationsRetractable Antenna Earpiece Status IndicatorsLook AT Your Phone Reading the Status Indicators Power/Lock IndicatorInUse Indicator Flip Cover Volume ControlsReading the Display NoSvc No Service IndicatorRoam Indicator Using the Battery Installing 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 Volume Adjusting the Earpiece VolumeAdjusting the Ringer Volume Using MuteMaking Emergency Calls Important NotesRedialing 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 Auto Lock Turbo DialEmergcy Call Number PrefTurning the Call-Time Reminder Tone Off/On Using the Menu FunctionsTurning the Signal Strength Meter 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 Using Scratchpad Memory Banking or Other Phone ServicesMemory Dialing Tips Frequently Dialed Area Codes/PrefixesLocking Your Phone Security FeaturesUsing Manual Lock Using Automatic Lock Changing the Lock CodeDisplaying the Lock Code Using Service Restrictions Service Description LevelFm Page 49 Wednesday, July 21, 1999 223 PM Other Features Using the Messaging FunctionsOverview/Receiving Messages 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 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 Specifications Patent InformationFm Page 72 Wednesday, July 21, 1999 223 PM Display Message Glossary Indiv Timer NoNamesStored Emergcy Call FullStd Setting Scan aScan AB 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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