Features

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Your RadioShack CT-502 Flip-Style Handheld Cellular Tele- phone with Silent Vibrating Alert is a state-of-the-art personal cellular telephone. It has all of these features:

Special Messaging Service Features — the phone is pre- programmed to work with special (subscription-only) messag- ing services offered by many cellular carriers, including calling line ID, voice mail notification, and short (alphanumer- ic) messages.

Vibration and Silent Alert Modes — let you set the phone to vibrate gently (instead of ring) when it receives a call, or make no sound or movement at all, to avoid disturbing oth- ers.

Nine Different Ringer Styles — let you set the phone’s ring- er to help you distinguish your phone’s ring from that of an- other phone.

Easy-to-Read Seven-Character Display — bright red LED characters let you see essential call information in almost any lighting condition.

Call Timers — let you keep track of the individual and cumu- lative call time (air-time), and includes a timer that you can re- set as you wish (so you can track monthly airtime, for example).

Speed/Memory Dialing — lets you store up to 50 phone numbers (of up to 32 digits each) and names (of up to 14 characters each) in memory and dial any of them by pressing one or two buttons.

Memory Scrolling — lets you rapidly search the memory lo- cations for a number you stored.

RadioShack is a registered trademark used by 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.