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Notes:

•Calls can be made on your phone from only one phone number at a time, and you cannot activate the other phone number while a call is in progress.

•To receive calls on both numbers at the same time (if you subscribe to no-answer transfer or call forwarding ser- vice through your cellular carrier), you can set both num- bers to forward to the other number if not answered. Otherwise, a caller who calls the inactive number receives the standard “not in service” message.

SETTING THE CELLULAR

SYSTEM TYPE

Each cellular market area has two cellular service providers. One of the providers is designated Provider A and the other Provider B. When your phone is activated for service, find out from your dealer whether your cellular provider is type A or B.

Notes:

•Usually, it is less expensive to use the same company for cellular service when you are in your home city and when you roam (see “Roaming” on Page 59). To do this, you need to know whether your cellular service provider is type A or B in your home city and in each city where you plan to travel.

•It is possible for a cellular service provider to be (or have agreements with) Provider A in some cities and Provider B in others.

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Radio Shack CT-502 owner manual Setting the Cellular System Type
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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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