NSC800 Conversion
Work in progress!
What is this all about?
Motivated by 2 things
- discovery of the NSC800 Z80 processor that is 80C85 like
- continuing to work in the direction of CP/M
I have invested some time and effort in developing a conversion that supports NSC800 operation in the M100, both for standard BASIC use, as well as CP/M (in conjunction with REXCPM). Partly this has been motivated simply by curiosity. However, in CP/M it actually broadens the software applicability since quite a bit of CP/M software is Z80.
If you have an interested in doing this conversion please get in touch with me at Twospruces at --the google mail service.
There are 2 areas of change that are needed. Firstly you have to adapt the NSC800 to the 80C85 socket. There are a couple of tradeoffs to make. Secondly, the NSC800 needs to use a slightly different Main ROM.
To get started on this project, one can leverage the work done in the past. In fact an NSC800 conversion for 80C85 was posted back in the early 80s for S100 computers equipped with an 8080/8085 processor board. The information is posted below.
Acknowledgements
I would like to acknowledge and thank those that have contributed to the project:
Philip Avery - for efforts with CP/M and attached Video using the VT100 Adapter
