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cc65 - a freeware C compiler for 6502 based systems
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0ee9b2e446
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Oliver Schmidt 0ee9b2e446 Changed run location of INIT segment. 
So far the INIT segment was run from the later heap+stack. Now the INIT segment is run from the later BSS. The background is that so far the INIT segment was pretty small (from $80 to $180 bytes). But upcoming changes will increase the INIT segment in certain scenarios up to ~ $1000 bytes. So programs with very limited heap+stack might just not been able to move the INIT segment to its run location. But moving the INIT segment to the later BSS allows it to occupy the later BSS+heap+stack.

In order to allow that the constructors are _NOT_ allowed anymore to access the BSS. Rather they must use the DATA segment or the new INITBSS segment. The latter isn't cleared at any point so the constructors may use it to expose values to the main program. However they must make sure to always write the values as they are not pre-initialized.
2015-10-14 22:52:09 +02:00
asminc Adapted, to the c64 target, the INIT-segment overlay scheme from the apple2 targets. 2015-10-05 05:47:43 -04:00
cfg Changed run location of INIT segment. 2015-10-14 22:52:09 +02:00
doc nes: Expose and document all joypad keys 2015-10-05 17:19:36 +03:00
include Keep low level VIC sprite stuff out of user code. 2015-10-09 18:33:35 +02:00
libsrc Changed run location of INIT segment. 2015-10-14 22:52:09 +02:00
samples Keep low level VIC sprite stuff out of user code. 2015-10-09 18:33:35 +02:00
src Fixed a warning message. 2015-09-25 02:31:17 -04:00
test Merge pull request #197 from greg-king5/static 2015-08-15 06:53:40 +02:00
testcode fix gregs complaints :) 2015-09-04 14:14:17 +02:00
util Changed multi-line C comments into another style. 2014-06-30 16:51:07 -04:00
.gitignore use 'testwrk' dir for bdiff 2014-11-25 12:56:45 +01:00
.travis.yml Run the regression tests _before_ replacing the built binaries with Win32 cross-builds. 2015-06-27 00:43:41 +02:00
LICENSE Simplified license. 2015-05-05 21:56:23 +02:00
Makefile Create zip file. 2014-03-09 00:20:17 +01:00
Makefile.travis Fixed file name of Windows binary snapshot. 2015-01-20 21:00:44 +01:00
README.md Update README.md 2015-09-24 10:16:46 +02:00

README.md

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cc65 is a complete cross development package for 65(C)02 systems, including a powerful macro assembler, a C compiler, linker, librarian and several other tools.

cc65 has C and runtime library support for many of the old 6502 machines, including

  • the following Commodore machines:
    • VIC20
    • C16/C116 and Plus/4
    • C64
    • C128
    • CBM 510 (aka P500)
    • the 600/700 family
    • newer PET machines (not 2001).
  • the Apple ][+ and successors.
  • the Atari 8 bit machines.
  • the Atari 5200 console.
  • GEOS for the C64, C128 and Apple //e.
  • the NEC PC-Engine (aka TurboGrafx-16).
  • the Nintendo Entertainment System (NES) console.
  • the Supervision console.
  • the Oric Atmos.
  • the Lynx console.
  • the Ohio Scientific Challenger 1P

The libraries are fairly portable, so creating a version for other 6502s shouldn't be too much work.