ZiLOG System 8000 Hardware Reference Manual page 32

CPU Zilog
CPU
3.3.1. Standard I/O:
All of the System 8000 CPU onboard
devices except the three Z80l0 MMUs are byte addressable
using standard
I/O
instructions which occupy the odd portion
of the
I/O
address space from FF8l through FFFF hexidecimal.
The
I/O
addresses for the
I/O
devices and their channels are
listed in Table 3-1. All onboard
I/O
devices except the
MMUs have been placed on the odd address boundries and they
receive and transmit byte data over ADO through AD7 of the
Z800lA CPU internal address/data bus.
3-fi
Zilog
3-6