Preface
STD bus compatibility, serial communications, interrupts, direct
memory access, power-fail protection, and battery backup.
Chapter 4, "Application Examples," provides specific examples of
the ZT 8809A in operation, including code to implement these
applications. The examples demonstrate the use of interrupts, timers,
and the real-time clock.
Chapter 5, "Memory and I/O Capability," focuses on the memory
and input/output organization of the V20 microprocessor relative to
the ZT 8809A.
Chapter 6,
"CPU Description (V20)," describes the basic
components of the V20 microprocessor, its enhancements over 8088
architecture, its ability to operate in both native mode and 8080
emulation mode, its operation with DMA, and the wait state
generator.
Chapter 7,
"Numeric Data Processor (8087)," explains the
installation and operation of the optional 8087 Numeric Data
Processor for numerically intensive applications.
Chapter 8, "Serial Communications (16C452)," describes the two
RS-232-C serial ports on the ZT 8809A, serial port signals, and
register addresses.
Chapter 9, "Centronics Printer Interface," details the Centronics
printer port interface.
Chapter 10,
"Real-Time Clock (DS 1215)," explains the
organization of the real-time clock, including method of access and
register organization.
