Hi Zbigniew, > As an interesting exercise I'm going to recreate a little computer, > whose design has been published on pages > https://sites.google.com/site/retroelec/home
Cute > > There is a statement: "An ATMega microcontroller is a Harvard > architecture machine. So to be able to load and run arbitrary code > without reprogramming the flash memory the code has to be interpreted. > Therefore the ATMega emulates a 6502 processor (-> von Neumann > architecture)." >From the perspective of the controller, any compiled forth code is data indeed. That data is handled by the inner interpreter (basically amforth-interpreter.asm). > So my question is: is it possible for AmForth to use the entire > external SRAM area for both data and my own new words? Forth words are represented with a single cell sized (e.g. 16bit) number called execution token (the data mentioned above). That number is used in the inner interpreter to identify both machine code to be executed *and* to identify more data (other compiled forth words). Thus if you want to place them at different memories, that would require changes in the core system: the inner interpreter, the words , (comma), compile, >body and execute. Maybe a few more as well. > You know, what > I'm after: to have "basic" Forth system burned into FlashRAM, and then > - as usual - to interactively develop the software for the little > machine using that 128 KB SRAM the guy selected for his design. To keep it simple(r), I'd recommend to separate the memories. Leave the flash for forth, and let the 6502 operate the RAM. The initial RAM content may come from flash. The flash may provide a block storage service for the 6502 system as well (floppy emulator?). Matthias ------------------------------------------------------------------------------ Dive into the World of Parallel Programming. The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Amforth-devel mailing list for http://amforth.sf.net/ Amforth-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/amforth-devel
