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For example, to enter the letter Y, press three times (since the letter Y is third in the series of letters on that key).

Notes:

•To store a space, press # twice (without entering a letter).

•To enter the letter Q (even though it is not printed on

the key), press twice. The other letters (P, R, and S) appear in sequence before/after Q as they do in the alphabet.

•If you make a mistake, repeatedly press CLR or to erase each incorrect character, then enter the cor- rect character(s).

4.When you finish, press STO to store the information in memory. The selected memory location number appears on the display to confirm the entry.

Note: If you previously stored information in the selected memory location, or if the phone’s memory is full, the selected memory location number and Full appear briefly, then the currently stored information and Change? flash on the display.

To select a different memory location, press END then STO , enter the new memory location number (or press to automatically select the first unused location), then press STO .

To use the selected memory location and replace the information currently stored there, press STO .

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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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