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Fabio,
Nice going! It's S-100, so imho, it's very much on topic. Aren't you afraid writing in C would take up the whole 2K? (and that's just to initialize the variables). I guess SDCC must be very a very slim C. Re: Bootstrapping CP/M, Rich Cini wrote a great guide on bootstrapping it. Between reading a few chapters of "The Programmers CP/M Handbook" by Andy Johnson-Laird and Rich's guide, I was able to boot up CP/M. This book is available somewhere as a download, but you can get a real copy pretty cheap on Amazon. Cheers, Josh Date: Tue, 27 May 2014 13:04:44 -0700 From: hkzl...@gmail.com To: n8vem...@googlegroups.com Subject: [N8VEM-S100:3798] Ithaca Audio Z80 board kit UP & Running with custom monitor! Ok, ok, this is offtopic as the Ithaca Audio is not a N8VEM board, but I got it as a bare board, built and debugged it... so it still somewhat related :-)
I was able to get this board from 1977 up and running in my N8VEM-based system and took the occasion to write my first monitor from scratch, as an exercise. This board fits a 2708 EPROM by default, or a 2716 after a simple mod (specified in the manual itself), so that is 2kb worth of space for my monitor: i decided for a mix of C (using SDCC) and ASM and this is the result. https://github.com/hkzlab/minos-z80-monitor The monitor is quite simple: all its "features" can be summarized as * I/O using the N8VEM console I/O, but easy to redirect on a serial console * Supports READ/WRITE of a single byte from memory * Supports IN/OUT from a port * Supports jumping the execution to an address * Supports XModem transfer to RAM at 19200bps using the N8VEM serial board/ Enough for a small development system (not that I really needed all this with the fantastic N8VEM Z80 cpu board I have...) and also as an example of a small SDCC project. Now I really need to read up on bootstrapping CP/M... I haven't had this fun with an hobby in ages :-) Bye everyone! Fabio -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to n8vem-s100+...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. |