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USING SCRATCHPAD MEMORY

Your phone’s scratchpad memory lets you temporarily store a telephone number on the display during a call. This is handy, for example, when someone gives you a number during a call and you don’t have a place to write it down.

To store a number in the scratchpad memory during a call, simply press the keys to enter that number. After you press END to end the call, you can press SND to immediately dial the scratchpad memory number.

Note: Unless you previously selected the silent scratchpad feature (see “Using Silent Scratchpad” on Page 27), be sure to tell the other party on the call that they will hear tones as you press the keys to enter the number.

MEMORY DIALING TIPS

Frequently Dialed Area Codes/Prefixes

To reduce the number of keystrokes you use to dial frequent- ly called area codes or prefixes, store that area code or prefix (including the 1, if necessary) in memory. To dial a number using that memory, simply recall that memory, enter the re- maining digits of the telephone number you are calling, then press SND to place the call.

Banking or Other Phone Services

For convenience, you can store in your phone’s memory the touch-tone command sequences you use when calling your bank or other phone services. See “Using Touch-Tone Ser- vices” on Page 61.

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Radio Shack CT-502 owner manual Using Scratchpad Memory, Memory Dialing Tips, Frequently Dialed Area Codes/Prefixes
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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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