Specifications

Chapter 1
INTRODUCTION
Contents Page
OVERVIEW ..................................................... 1-1
ZT 88CT08A and ZT 88CT09A
................................ 1-3
FEATURES OF THE ZT 8809A
................................... 1-4
FUNCTIONAL BLOCKS
......................................... 1-6
V20 (uPD70108) Processor
.................................... 1-6
Memory and I/O Addressing
................................... 1-6
Wait-State Generator
.......................................... 1-7
Direct Memory Access (DMA)
................................ 1-7
Optional Battery Backup
...................................... 1-7
AC/DC Power-Fail Detection
.................................. 1-8
Real-Time Clock
............................................. 1-9
Serial Communications
....................................... 1-9
Counter/Timers
............................................. 1-10
Interrupts
................................................... 1-11
Centronics Printer/General Purpose I/O Port
.................... 1-12
Optional Numeric Data Coprocessor (8087)
.................... 1-12
Clock Slowdown & Halt Restart (CMOS boards only)
........... 1-13
OVERVIEW
The 5 MHz ZT 8808A and 8 MHz ZT 8809A are 16-bit single board
computers (SBCs) designed with DOS applications on the STD bus in
mind. The high level of integration allows for a complete STD DOS
system on one board. All peripherals are located at the same I/O
addresses as on the IBM PC, allowing for a greater degree of
software compatibility.
1-1