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I've just fixed an XEGS with a bad ROM and MMU, and have got it going temporarily by flashing four copies of the XEGS OS to a 27C128. Naturally it boots straight to the Self-Test, since there's no BASIC or Missile Command. I can't seem to find out what the ROM layout is supposed to be, however, on a 32K chip (i.e., is it BASIC, Missile Command, OS ROM, or OS ROM, Missile Command, BASIC?). Needless to say I've also been unable to locate a complete 32K dump of the XEGS ROM, otherwise I wouldn't be asking how to manually assemble one.
Hi together! Charles W. Marslett has released the FastChip source code, the rewritten ATARI Floating Point ROM routines!!! I am speechless and so lucky, that a pictues says more than thounds words: Charles, in the name of the community, thank you so much for your work, your contribution, your help and so much more. We are really deep in your obligation! More from Charles: https://atariwiki.org/wiki/Wiki.jsp?page=Articles#section-Articles-OperatingSystemsOS https://atariwiki.org/wiki/Wiki.jsp?page=MyDOS https://atariwiki.org/wiki/Wiki.jsp?page=A65%20Assembler FastChipAsm.zip