Zilog Z80195 - Manual (Page 11)

Z80185/195 D EVELOPMENT K IT
U SER ' S M ANUAL
2-3 UM951800100
Z ILOG
SETTING UP THE SERIAL CHANNELS
The Z80185/195 includes three serial channels called ASCI0, ASCI1, and the ESCC channel. The
board is shipped ready to use ASCI1 as the user interface for the Debug Monitor, with RS-232 DCE
pinning on ASCI1 connector J9.
Using the ASCI1 User Interface (Default) . If you will be using ASCI1, and you don’t need to configure
ASCI0 or the ESCC channel, perform the following steps:
1. Connect a DB-9 to DB-25 serial cable between one of the COM ports of your PC and J9 on the
board.
2. Skip to the “Setting Up the Parallel Channel” section, which follows.
Otherwise, read the applicable sections that follow.
Selecting the Serial Channel for the Monitor
The Debug Monitor in the EPROM on the board can use ASCI0, ASCI1, or the ESCC channel for its
user interface. On this 185/195 board, this choice is controlled by jumpers on J14-2 and J14-5, which
are connected to the 185’s /INT1 and /INT2 pins respectively. You will want to connect a DB-9 to DB-
25 serial cable between a COM port of your PC and the female DB-25 DCE connector for the selected
channel.
Function Jumper Connections
ASCI1 for the Monitor interface J14-2 and J14-5 open, connect the serial cable to J9.
ASCI0 for the Monitor interface Ground J14-2, J14-5 open, connect the serial cable to
J13.
ESCC channel for the Monitor J14-2 open, ground J14-5, connect the serial cable
interface to J11.
Ground pins to J14-2 or J14-5 J8-6, J10-7, J12-7, J15-4, J15-6, and the following pins
around the Z80195 processor:
Pin Connector Pin
18 P2-20
40 P3-10
59 P4-22
63 P4-18
92 P5-9
ESCC LocalTalk/AppleTalk on J16
Pins 1-3 of J15 determine whether the ESCC channel takes its receive data from the LocalTalk/
AppleTalk connector J16, or one of the DB25 connectors J10 or J11.