Read-Only Memory; Keyboard; Speaker - Zenith Z-150 User Manual

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Hardware
Read-Only Memory
Read-Only Memory (ROM) retains the information stored in it even after
the computer is turned off. It contains information which is vital to your
computer's operation. The CPU/memory card has one ROM chip which
contains:
• Power-up diagnostics;
• Facilities that enable programmers to enter, examine, change, or
run machine language programs;
• The boot (or bootstrap loader) program which enables your com ­
puter to load the operating system into system memory from disk;
• Extensive menu-selectable diagnostics, covered in "General Service,"
Chapter 4 of this manual;
• Video mode and scroll mode set commands, used to select the screen
characteristics for the video display.
Keyboard
The keyboard connector is located on the CPU/memory card and extends
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through the rear of the computer.
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The keyboard functions as an input device for your computer. See the
separately bound User's Guide for information concerning special keys.
Speaker
Your computer has a 2-inch speaker.
GW-BASJC supports various tones and durations that enable your com ­
puter to playa full range of music. Consult the GW-BASIC manual for
specific programming information.