17-1111.fm Page 52 Wednesday, July 21, 1999 2:23 PM

2.To view another message, repeatedly press (to scroll backwards) or # (to scroll forwards) until that message appears.

3.When you finish, press END to exit the message func- tion.

Deleting Messages

To delete an individual message, recall that message, then hold down CLR until the phone displays Deleted.

To delete all messages in the stack, while viewing any mes- sage, hold down CLR until the phone displays Deleted (briefly) then Erase All. Then press CLR again to confirm the deletion.

When you finish, press END to exit the message function.

USING THE PHONE WITH HANDSFREE EQUIPMENT

Your phone is preprogrammed to work with most optional handsfree equipment that lets you automatically switch from handset to handsfree mode in your vehicle when you place the phone in the handsfree holder.

Some handsfree equipment might require you to turn off (mute) the phone’s microphone when switching to handsfree, using the procedure described in “Using Mute” on Page 18. See the owner’s manual provided with your handsfree equip- ment for more information, or contact your local RadioShack store for assistance.

52

Page 51 Page 53
Page 52
Image 52
Radio Shack CT-502 owner manual Using the Phone with Handsfree Equipment, Deleting Messages
Page 51 Page 53

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