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To turn the microphone on again, press FCN MNO6 again so Mute disappears.

Hint: To help you remember which key to use, note that “M” (for mute) appears on the MNO6 key.

Note: Pressing END to end a call also turns the microphone back on.

MAKING EMERGENCY CALLS

Your phone is preprogrammed to let you dial your local emer- gency number (such as 911) at the press of a single button, even if the phone is locked (see “Locking Your Phone” on Page 45). Before you can use this feature, however, you must first program the emergency number you want to use in memory location 01 of your phone. See “Storing Speed Dial Numbers” on Page 36.

To place an emergency call once you have stored the emer- gency number, simply hold down 1 for about 1 second. Emergcy appears and the phone dials the emergency num- ber.

Important Notes:

•If one-touch dialing is turned off (see “Turning One- Touch Dialing Off/On” on Page 32), you cannot make

emergency calls using the

1 key.

•When you make an emergency call, give your name and cellular phone number, as well as the location of the inci- dent. Remember that your phone might be the only means of communication at the accident scene. Do not end the call until you are advised you may do so.

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Radio Shack CT-502 owner manual Making Emergency Calls, Important Notes
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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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