Radio Shack 85 owner manual Operation, Turning on the Amplifier, Setting the Level Control

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12-1977.fm Page 23 Tuesday, July 13, 1999 10:07 AM

OPERATION

TURNING ON THE AMPLIFIER

The amplifier automatically turns on whenever you turn your vehicle’s ignition switch to ACC or ON. POWER lights when the amplifier is operating.

SETTING THE LEVEL CONTROL

For the best performance, you can adjust the level of audio signals that enter the amplifier by following these steps.

Cautions:

•When the amplifier’s internal temperature reaches 202×F, the automatic thermal protection system lowers the amplifier’s output power until it cools down.

•The sound distorts if any output channel shorts. Turn off the amplifier and try to locate the short.

•To prevent draining the vehicle’s battery, do not operate the amplifier using the ignition switch’s ACC position for too long after turning off the vehicle’s ignition.

1. Turn both LEVEL MIN/MAX controls fully counterclockwise to MIN.

Note: The right level control adjusts the inputs to CH1 and CH2 (normally the front) and the left level control adjusts the inputs to CH3 and CH4 (nor- mally the rear).

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Contents 85 × 4 High Power 4-Channel Trunk Mount Amplifier Automatic Thermal Protection FeaturesMute Turn On Circuit eliminates Contents Choosing a Mounting Location Before YOU Begin the InstallationPreparation Connecting Ground and PRIMARY/SWITCHED Power Illus please add a dwg that illustrates step Low Level Input Connections Connecting to Your Autosound SystemFm Page 9 Tuesday, July 13, 1999 1007 AM Fm Page 10 Tuesday, July 13, 1999 1007 AM High-Level Input Connections Floating Ground Connection Common Fm Page 13 Tuesday, July 13, 1999 1007 AM Preparing the Speaker Wires Connecting the SpeakersConnecting Four Speakers Connecting Two Speakers Unbridged Connection Connecting Two Speakers Bridged Connection Fm Page 18 Tuesday, July 13, 1999 1007 AM Connecting Two Unbridged Speakers and One Bridged Subwoofer Testing the Connections Mounting the Amplifier Fm Page 22 Tuesday, July 13, 1999 1007 AM Turning on the Amplifier Setting the Level ControlOperation Over Freq Control Using the Frequency CrossoverOver Freq On/Off Switch Maintenance Replacing a Blade-Type Fuse Replacing the FusesReplacing the Tube-Type Fuse Specifications Radio Shack

85 specifications

Radio Shack 85, often referred to as the TRS-80 Model 100, was a remarkable portable computer introduced in the early 1980s. This compact device was designed primarily for business professionals and writers, embodying cutting-edge technology that set it apart from its contemporaries. With its sleek and lightweight design, the Radio Shack 85 became one of the first truly portable computers, providing users with the ability to work on the go.

One of its standout features was the full-sized keyboard, which offered a comfortable typing experience. The keyboard was designed with functionality in mind, including dedicated function keys that made it easier to access essential commands. The built-in LCD screen, although monochrome, delivered clarity and visibility that was impressive for its time. The screen provided a resolution of 64x16 characters, making text reading and editing straightforward.

The Radio Shack 85 operated on a Zilog Z80 microprocessor, running at a speed of 5 MHz. This processor delivered solid performance for the applications and tasks typical of the era, including word processing and basic data management. Users could store their data on the internal 32 KB of RAM, which was expandable to 64 KB, a significant amount for the time. For data storage, the device featured a built-in cassette tape interface, allowing users to save and load their work conveniently.

In terms of software, the Radio Shack 85 came pre-loaded with several basic applications, including a word processor and a simple spreadsheet program. It also had the capability to run other software written for the TRS-80 line, giving users access to a broader range of applications. Its compatibility with the TRS-DOS operating system helped users transition from other TRS-80 models without significant hurdles.

Power efficiency was another notable characteristic of the Radio Shack 85. The device could operate on just four AA batteries, allowing for hours of productivity without needing a wall outlet. This feature made it an ideal companion for those who traveled frequently or worked in remote locations.

Overall, the Radio Shack 85 was a groundbreaking device that combined portability, functionality, and efficiency. Its combination of a comfortable keyboard, a capable processor, and a lightweight design paved the way for future portable computing innovations, leaving a lasting legacy in the technology landscape.
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