17-1111.fm Page 53 Wednesday, July 21, 1999 2:23 PM

USING THE CALL TIMERS

Your phone has three call timers that let you check the length of your calls (“air time”):

Individual call timer — times each call you make or answer in minutes and seconds, and automatically resets each time you make or answer a call or turn off the phone. See “Displaying the Individual Call Timer.”

Resettable call timer — times the calls you make or answer in minutes, and it can be reset at any time. See “Using the Resettable Call Timer” on Page 54.

Cumulative call timer — times all the calls you make or answer in minutes, and it cannot be reset. See “Display- ing the Cumulative Call Timer” on Page 54.

Notes:

Each call timer begins counting when you hear the first ring (during an outgoing call) or when your phone rings (or vibrates) to signal an incoming call.

If your phone receives a call but you do not answer it, each timer resets to the time it had before it received that incoming call.

Displaying the Individual Call Timer

The individual call timer tracks each call you make in minutes and seconds, and automatically resets each time you make or answer a call or when you turn off the phone.

To display the individual call timer for the last call, press RCL

# # . The air time of your last call (such as 00 45 to show 45 seconds) appears for about 15 seconds. Press any key to clear the display sooner.

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Radio Shack CT-502 owner manual Using the Call Timers, Displaying the Individual Call Timer

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.