17-1111.fm Page 62 Wednesday, July 21, 1999 2:23 PM

CALLING CARD DIALING

To use your cellular phone to dial long distance numbers with a calling card number, you can simply dial as you usually would (for example, dial 0 and the telephone number then press SND, then enter your calling card number when you hear the prompt).

For convenience, your phone lets you store a calling card se- quence in memory with your long distance carrier’s calling card PIN. When you use this stored sequence to make a call, the phone automatically sends the required calling card infor- mation and prompts you to enter the telephone number you want to call.

Storing a Calling Card Sequence

1.If you dial a regular phone number (such as a 1-800

number) to start a calling card call, enter that number, then enter a pause (press FCN SND STO ).

Or, if you dial 0 before the telephone number to start a calling card call, press OPER 0 so 0 appears.

2.Press FCN SND # so Insert Num‘N flashes.

3.Within 8 seconds, press STO so ‘N appears after the numbers you previously entered. (‘N represents the place where the phone will prompt you to enter the area code and number you want to call.)

Note: If you are unable to press STO within 8 seconds, the display clears. Press any key to recall the display.

4.Enter another pause.

5.Enter your calling card PIN number.

62

Page 61 Page 63
Page 62
Image 62
Radio Shack CT-502 owner manual Calling Card Dialing, Storing a Calling Card Sequence
Page 61 Page 63

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.
Top Page Image Contents