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Diffstat (limited to 'system/atari800_os++/README.atari800')
| -rw-r--r-- | system/atari800_os++/README.atari800 | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/system/atari800_os++/README.atari800 b/system/atari800_os++/README.atari800 new file mode 100644 index 0000000000..1d03af498d --- /dev/null +++ b/system/atari800_os++/README.atari800 @@ -0,0 +1,23 @@ + +This copy of OS++ has been slightly modified to allow it to work with +the Atari800 emulator. Specifically, Atari800 patches the operating +system ROM to support high-speed emulated disk I/O. Unfortunately, +when this is done, OS++'s checksum routines correctly detect that the +ROM checksum doesn't match, and the OS doesn't start. + +The *correct* way to fix this is to make Atari800's ROM patch actually +update the stored checksum after patching. For Atari800 2.1.0 and +previous, the workaround is to replace OS++'s checksum calls with NOPs, +which is what's been done to this copy of OS++ (future versions of +Atari800 will hopefully have proper support for OS++) + +Note that OS++ only works correctly with Atari800 if the emulator's +high-speed SIO patch is enabled. Without the fast SIO patch, OS++ can't +read the emulated disk drives. Most likely, this is due to Atari800 not +emulating the hardware 100% perfectly. + +Also, this is documented elsewhere, but worth a mention here, too: OS++ +does not include BASIC! Machine language programs normally don't call +the BASIC cartridge, so they will be unaffected. If you want to be able +to run BASIC without using the copyrighted Atari BASIC ROM, try the +excellent public domain Turbo BASIC XL. |