Radio Shack 85 Using the Frequency Crossover, Over Freq On/Off Switch, Over Freq Control

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12-1977.fm Page 24 Tuesday, July 13, 1999 10:07 AM

2.Temporarily turn up the autosound system’s volume control to about one- third of its full range.

Caution: Never turn the level controls up any farther than you need to get clear sound at two thirds volume maximum.

3.Turn the left and right LEVEL controls clockwise until you can hear the sound at a comfortable level.

4.Turn up the volume on your autosound system until the sound begins to dis- tort. Then immediately turn down the volume to the point just below where distortion began.

5.Adjust the level controls until the volume is at the maximum level you want the autosound system to produce.

6.Adjust the autosound system’s volume control to a comfortable listening level.

USING THE FREQUENCY CROSSOVER

X-OVER FREQ On/Off Switch

To use the amplifier’s crossover function with a subwoofer, push in X-OVER FREQ to On. To use the amplifier without a subwoofer, push and release X-OVER FREQ to Off.

X-OVER FREQ Control

When you push in X-OVER FREQ to On, the X-OVER FREQ 45 Hz/400 Hz lets you adjust the crossover frequency from 45 Hz to 400 Hz for Channels 3 and 4 so you can adjust the sound to compensate for your vehicle’s acoustics.

Note: Since this only controls the 45–400 Hz frequencies, this control is useful only for subwoofers and not your main speak- ers.

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Contents 85 × 4 High Power 4-Channel Trunk Mount Amplifier Features Automatic Thermal ProtectionMute Turn On Circuit eliminates Contents Before YOU Begin the Installation PreparationChoosing a Mounting Location Connecting Ground and PRIMARY/SWITCHED Power Illus please add a dwg that illustrates step Connecting to Your Autosound System Low Level Input ConnectionsFm 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 Connecting the Speakers Preparing the Speaker WiresConnecting 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 Setting the Level Control OperationTurning on the Amplifier Using the Frequency Crossover Over Freq On/Off SwitchOver Freq Control Maintenance Replacing the Fuses Replacing the Tube-Type FuseReplacing a Blade-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.