Monitor Rom; Power-Up Checks - Zenith Z-100 Reference Manual

page 2.2
System Operating Features

Monitor ROM

Your computer contains very powerful programming, servicing, and testing routines
that are programmed permanently into the machine's ROM. These routines may
be used to manipulate and program many of the features and functions of your
computer, such as accessing the user and video RAM and implementing the varied
video text and graphics capabilities.
Also incorporated in the ROM code, are provisions for loading (booting) an operat-
ing system, such as MS-DOS, from any disk drive in your system. The Dual In-line
Package (DIP) switches on the Central Processing Unit (CPU) card may be set
to implement an autoboot at powerup or a keyboard initiated manual boot. Refer
to the Configuration section in Chapter 4 for DIP switch setup instructions.
NOTE: Also available is the Disk-Based Diagnostics for the Z-100 PC Series, Model
CB-5063-13, a highly comprehensive system checkout and servicing utility. Details
on the use of this utility are provided with the Disk-Based Diagnostics package.
The Monitor ROM features indude four types of routines:

Power-up checks

User-selected tests
Interactive programming and debugging routines
Programmable I/O facilities
Power-Up Checks
The following hardware checks are automatically made when the computer is
tumed on:
CPU
ROM
User RAM
Interrupt control and timer circuits
Parity RAM
Keyboard microprocessor
Disk drive read
Disk drive seek function
Disk controller
Disk Direct Memory Access (DMA) overrun
Disk sector
Disk Cydic Redundancy Check (CRC)
Disk address mark
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