DIY Southern Cross II Manuel du matériel - Page 2

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The Southern Cross II single board computer is based around the 8032/52 8-bit microcontroller. Adding a

power supply and connecting to any PC capable of running an 8051 cross-assembler enables the user to

implement an 8031 software development system. Programming in BASIC is also possible using one of the

8052-BASIC chips currently available. If your board is fitted with one of these BASIC chips then switching

from one software environment to the other is simply a matter of inserting or removing a link.

The Southern Cross II, when used in conjunction with the MVS-31 debugging monitor, implements a

complete 8031-based assembly language software development system. The extra resources provided by an

8032/52 over an 8031,(extra timer and an additional 128 bytes of internal RAM memory), together with an

independent external UART allows the user complete access to all the 8031's internal ports and timers.

Software debugging tools such as breakpoints, watchpoints and single stepping are provided by the MVS-31

monitor program. Refer to the "MVS-31 User's manual" for further details.

Running in 8031 mode

Insert the MVS-31 monitor EPROM into socket IC4 and ensure that jumper JP2 is set to the correct EPROM

type. An 8032/52 microcontroller chip must be used in position IC1.

Insert a link on jumper JP1.

Move switch SW2 to the OFF position.

Connect a 9 - 12 volt DC plug pack via power connector J7.

Connect the supplied serial cable to connector J5 ("HOST" port). Connect a terminal or PC (running

terminal emulation software) to the D25 connector on the cable. Configure the terminal or PC serial port

to 8 data bits, 1 stop bit and no parity. The baud rate should be set to 1200, 2400, 4800, 9600 or 19200

bps.

Turn on the power via switch SW3. LED D2 should light.

Press the Carriage Return ( Enter↵ ) key to trigger the MVS-31 automatic baud rate detection. A sign on

banner will appear followed by a " > " prompt. Commands may now be entered.

Running in BASIC mode

This mode requires an 8052-BASIC microcontroller chip in position IC1. A 27256 EPROM is also necessary

in position IC4 if BASIC programs are to be saved into EPROM. Ensure that jumper JP2 is set to the correct

EPROM type.

Remove the link from jumper JP1.

Move switch SW2 to the OFF position.

Connect a 9 - 12 volt DC plug pack via power connector J7.

Connect the supplied serial cable to connector J6 ("USER" port). Connect a terminal or PC (running

terminal emulation software) to the D25 connector on the cable. Configure the terminal or PC serial port

to 8 data bits, 1 stop bit and no parity. The baud rate should be set to 1200, 2400, 4800, 9600 or 19200

bps.

Turn on the power via switch SW3. LED D2 should light.

Press the space bar to trigger the BASIC-52 automatic baud rate detection. A sign on message will

appear followed by a "READY" prompt. Commands may now be entered.

Please read the section on "BASIC-52 Programming" before attempting to save any programs into EPROM.

Introduction

Getting Started