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Summary of Contents for DIY Southern Cross II
- Page 1 DIY Electronics Southern Cross II 8031 Single Board Computer Hardware Manual DIY Electronics (HK) Ltd PO Box 88458 Sham Shui Po Hong Kong Fax: (852) 2725-0610 Voice: (852) 2720-0255 Email: sales@kitsrus.com http://kitsrus.com November, 1998.
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Page 2: Getting Started
Introduction 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. - Page 3 ORing the /PSEN and /RD signals with the decoded memory range required and using the resultant output as a read strobe. Combining Program and Data memory is necessary on the Southern Cross II so that users can download and run programs.
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Page 4: Serial Ports
"CTS, DSR and DCD" are held at the RS-232 "ON" level and do not provide any hardware handshaking. No software handshaking protocol is used either. The Southern Cross II has two serial ports. Uses the internal serial port of the 8032/52 chip and is referred to as the "USER" port. Connection is via the 10-pin header labelled J6. -
Page 5: Parallel I/O Ports
P0 and P2, are used as address/data busses when external program and data memory access is required. This is the mode in which the Southern Cross II operates. Port bits P3.6 and P3.7 are used as /RD and /WR signals and therefore are not available for use as I/O lines. - Page 6 These ports are pin for pin compatible to the CN1 port on the Z80 based "Southern Cross" computer, also available from DIY Electronics. It is provided on the Southern Cross II to take advantage of a number of add- on boards already available for the "Southern Cross" computer.
- Page 7 The DS1216C contains an internal lithium battery. This keeps the clock going during power down and also makes the CMOS RAM non-volatile ie. no loss of data when power to the Southern Cross II is removed. Battery life is over 10 years. No circuit modifications are necessary to use the DS1216C, just plug it in between the RAM chip and the IC socket (or solder directly to the PCB if purchased with the Southern Cross II kit).
- Page 8 EPROMs. If you wish to keep them together then make a copy of the MVS-31 EPROM and use the copy instead. The MVS-31 binary file is on the disk supplied with the Southern Cross II computer.
- Page 13 Question: Why Register? Answer: So that you can be notified when new hardware and software becomes available. The Southern Cross II will be supported in the future with new hardware, software and documentation. Please fill in the form below and return to:...
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