being "driven" from a device connected to J1. Therefore, it is advisable before saving programs to EPROM to
disconnect any device from J1.
To summarize, the following steps must be carried out before issuing a BASIC-52 programming command.
1.
Disconnect any device attached to connector J1.
2.
Move switch SW2 to the " ON " position.
Whilst the MVS-31 monitor program and BASIC programs can be stored on the same 27256 EPROM it is
advisable to use two separate 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.
References
The hardware & software for the Southern Cross 2 were developed by Frank Crivelli for DIY Electronics.
Frank can be contacted at [email protected]
The following web sites contain 80xx code & material
http://www.lvr.com
http://livewire.ee.latrobe.edu/~sjm
http://cera2.com/gatox805.htm
http://www.atmel.com