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cc65 - a freeware C compiler for 6502 based systems
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8cb941985d
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Sidney Cadot 8cb941985d sim65: tighten 6502 register types 
After a lot of preparatory work, we are now in position to finally tighten
the types of the 6502 registers defined in the CPURegs struct of sim65.

All registers were previously defined as bare 'unsigned', leading to subtle
bugs where the bits beyond the 8 or 16 "true" bits in the register could
become non-zero. Tightening the types of the registers to uint8_t and
uint16_t as appropriate gets rid of these subtle bugs once and for all,
assisted by the semantics of C when assigning an unsigned value to an
unsigned type with less bits: the high-order bits are simply discarded,
which is precisely what we'd want to happen.

This change cleans up a lot of spurious failures of sim65 against the
65x02 test-set. For the 6502 and 65C02, we're now *functionally*
compliant. For timing (i.e., clock cycle counts for each instruction),
some work remains.
2024-12-19 23:13:20 +01:00
.github Make lastline.sh ignore empty files. Fixes #2514. 2024-09-12 09:10:37 +02:00
asminc Changed 0x hex values to % binary values 2024-11-09 11:45:41 +01:00
cfg Added asm configs for C16 & Plus/4 2024-06-16 19:14:24 +03:00
doc Merge pull request #2558 from polluks/cpp 2024-12-15 23:02:35 +01:00
include Rename dir_file_count to dir_entry_count 2024-11-15 19:25:40 +01:00
libsrc Merge pull request #2558 from polluks/cpp 2024-12-15 23:02:35 +01:00
samples Update sieve.c 2024-12-09 18:26:00 +01:00
src sim65: tighten 6502 register types 2024-12-19 23:13:20 +01:00
targettest Overlooked a few target tests that take the address of main(). 2024-09-02 16:55:58 +02:00
test Merge pull request #2522 from kugelfuhr/kugelfuhr/code-optimizations 2024-10-05 15:03:46 +02:00
util
.editorconfig
.gitattributes
.gitignore Revert the change to .gitignore so git status doesn't report a clean status as 2024-09-13 19:02:13 +02:00
.travis.yml
Contributing.md add comment on function prototypes 2024-09-08 17:08:40 +02:00
LICENSE
Makefile
Makefile.travis
README.md Some clarification 2024-08-10 15:29:50 +02:00

README.md

The cc65 cross-compiler suite

cc65 is a complete cross-development package for 65(C)02 systems, including a powerful macro assembler, a C compiler, linker, archiver, simulator and several other tools. cc65 has C and runtime library support for many of the old 6502 machines. For details look at the cc65 web site:

Company / People Machine / Environment
Apple Apple II
Apple IIe enhanced
Atari Atari 400/800
Atari 2600
Atari 5200
Atari 7800
Atari XL
Lynx
Tangerine Oric Atmos
Eureka Oric Telestrat
Acorn BBC series
Commodore C128
C16
C64
CBM 510/610
PET
Plus/4
VIC-20
VTech CreatiVision
Commander X16 Community Commander X16
Bit Corporation Gamate
Berkeley Softworks GEOS (Apple/CBM)
LUnix Team LUnix (C64)
Nintendo Nintendo Entertainment System (NES)
Ohio Scientific OSI C1P
MOS Technology, Inc. KIM-1
NEC PC Engine (PCE)
Dr. Jozo Dujmović Picocomputer (RP6502)
Watara Watura/QuickShot Supervision
Synertek SYM-1

A generic configuration to adapt cc65 to new targets is also around.

People

cc65 is originally based on the "Small C" compiler by Ron Cain and enhanced by James E. Hendrix.

Project founders

  • John R. Dunning: original implementation of the C compiler and runtime library, Atari hosted.
  • Ullrich von Bassewitz:
    • moved Dunning's code to modern systems,
    • rewrote most parts of the compiler,
    • rewrote all of the runtime library.

Core team members

External contributors

(The above list is incomplete, if you feel left out - please speak up or add yourself in a PR)

For a complete list look at the full team list or the list of all contributors.

Contact

For general discussion, questions, etc subscribe to the mailing list or use the github discussions.

Some of us may also be around on IRC #cc65 on libera.chat.

Documentation

  • The main Documentation for users and developers.
  • Info on Contributing to the CC65 project. Please read this before working on something you want to contribute, and before reporting bugs.
  • The Wiki contains some extra info that does not fit into the regular documentation.

Downloads

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