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Radio Shack CT-502 owner manual Roaming, Using Cellular System PIN Dialing

Models: CT-502

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17-1111.fm Page 59 Wednesday, July 21, 1999 2:23 PM

ROAMING

In some areas, the cellular system’s computer automatically recognizes roaming telephones. In other areas, you must contact the service provider before it can recognize your phone. The operator needs to know your telephone number, your phone’s ESN (Electronic Serial Number), and how you plan to pay for your calls. There is normally an additional charge for roaming calls.

Note: Your phone’s ESN is under the phone’s battery; how- ever, the roaming cellular service provider can usually auto- matically determine your phone’s ESN when you call.

When you roam, the Roam indicator on your phone flashes slowly when the phone is using a home-type cellular system. The indicator flashes rapidly when the phone is using a cellu- lar system that is different from your home system.

USING CELLULAR SYSTEM

PIN DIALING

Your cellular carrier might require that you use a personal identification number (PIN) when you make calls. This num- ber assures the cellular system that the person placing the call is an authorized user.

Contact your cellular service provider to determine if a PIN is required and obtain the PIN (7 digits or less) to place calls through the cellular system you subscribe to. If a PIN is re- quired, follow the steps in “Storing Speed Dial Numbers” on Page 36 to store your PIN in memory 07, then follow the steps in “Enabling/Disabling PIN Dialing” on Page 60 to en- able PIN dialing on your phone.

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Radio Shack CT-502 owner manual Roaming, Using Cellular System PIN Dialing
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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.