17-1111.fm Page 73 Wednesday, July 21, 1999 2:23 PM

DISPLAY MESSAGE GLOSSARY

Message

 

Description

See

 

 

 

Page(s)

 

 

 

NN’

Memory scrolling is active (where

40

 

NN is the memory number)

 

 

 

 

o

Shows a pause stored in memory

61

 

 

 

Alpha or STO

Prompts you to press the “alpha”

36

 

keys or

STO

 

 

 

 

Auto Ansr

Automatic answer

31

 

 

 

Auto Lock

Automatic lock

46

 

 

 

A1

Two-system operation; non-wire-

55

 

line system is active, using phone

 

 

number 1

 

 

 

 

A2

Two-system operation; non-wire-

55

 

line system is active, using phone

 

 

number 2

 

 

 

 

B1

Two-system operation; wireline sys-

55

 

tem is active, using phone number

 

 

1

 

 

 

 

 

B2

Two-system operation; wireline sys-

55

 

tem is active, using phone number

 

 

2

 

 

 

 

 

One Min Timr

Call-time reminder tone

26

 

 

 

Busy

Master clear in progress

65

 

 

 

Call

Call now being, or was previously,

16, 17

 

received

 

 

 

 

 

Change?

Memory prompt to caution before

36, 42

 

overwriting previously stored infor-

 

 

mation

 

 

 

 

 

Clear?

Memory prompt to caution before

43

 

clearing a memory entry

 

 

 

 

Emergcy

Emergency call in progress

19, 33

 

(using

1 )

 

 

 

 

 

73

Page 73
Image 73
Radio Shack CT-502 owner manual Display Message Glossary

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.