Radio Shack CT-502 specs

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6.Within 8 seconds, press STO then enter the 2-digit mem- ory location number (01–50) where you want to store the

card sequence, or press to automatically select the first unused memory location. Alpha or STO appears to prompt you for the next step.

Note: If you are unable to complete this step seconds, the display goes blank. Press END recall the display and try again.

within 8

STO to

7.Enter the name to describe this calling card sequence (XYZ LONG DIST, for example), then press STO . To proceed without storing a name, simply press STO .The phone displays the memory location number you selected to confirm the entry.

Placing a Call Using a Stored Calling Card Sequence

1.Recall the calling card sequence from memory, then

press SND to dial the call. (Or, if you stored the sequence in any memory from 02–09, simply hold down that num- ber for one-touch dialing.) Enter Number appears. This prompts you to enter the area code and phone num- ber you want to call.

2.Enter the area code and phone number you want to call,

or recall that number from memory, then press SND. The phone begins dialing the call.

Note: When you press the keys, the phone sounds dif- ferent tones than the ones it normally makes.

3.When you hear the prompt, press SND to dial the calling card PIN (or other information you stored in the calling card sequence).

Note: Repeat this step for each sequence you stored.

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.