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diff --git a/musashi-m68k/history.txt b/musashi-m68k/history.txt new file mode 100644 index 0000000..e2205dc --- /dev/null +++ b/musashi-m68k/history.txt @@ -0,0 +1,115 @@ +The history of Musashi for anyone who might be interested: +--------------------------------------------------------- + +Musashi was born out of sheer boredom. +I needed something to code, and so having had fun with a few of the emulators +around, I decided to try my hand at CPU emulation. +I had owned an Amiga for many years and had done some assembly coding on it so +I figured it would be the ideal chip to cut my teeth on. +Had I known then how much work was involved in emulating a chip like this, I +may not have even started ;-) + + +15-Jul-2013: Musashi license changed to MIT. + +10-Jun-2002: Musashi 3.4 released + - Added various undocumented m68k features thanks to Bart + Trzynadlowski's experiments. + See http://dynarec.com/~bart/files/68knotes.txt for details. + - Fixed a bug that caused privilege violation and illegal + instruction exceptions to stack the wrong PC value. + - Added emulation of address errors (Note: this only works + in 68000 mode. All other CPUs require a LOT of overhead + to emulate this. I'm not sure if I'll implement them or not. + +27-Jan-2001: Musashi 3.3 released + - Fixed problem when displaying negative numbers in disassembler + - Fixed cpu type selector - was allowing 020 instructions to be + disassembled when in 000 mode. + - Fixed opcode jumptable generator (ambiguous operators in the + test for f-line ops) + - Fixed signed/unsigned problem in divl and mull opcodes (not + sure if this was causing an error but best to be sure) + - Cleaned up the naming scheme for the opcode handlers + +14-Aug-2000: Musashi 3.2 released + - Fixed RTE bug that killed the program counter when in m68020 + mode. + - Minor fixes in negx and nbcd. + - renamed d68k.c to m68kdasm.c and merged d68k.h into m68k.h. + d68k_read_xxx() instructions have been renamed to + m68k_read_xxx_disassembler(). + - Rewrote exception processing and fixed 68020 stack frame + problems. + - FINALLY fixed the mull and divl instructions. + - Added 64-bit safe code fixes. + - Added 64-bit optimizations (these will only be ANSI compliant + under c9x, and so to use them you must turn on M68K_USE_64_BIT + in m68kconf.h). + +28-May-2000: Musashi 3.1 released + - Fixed bug in m68k_get_reg() that retrieved the wrong value for + the status register. + - Fixed register bug in movec. + - Fixed cpu type comparison problem that caused indexed + addressing modes to be incorrectly interpreted when in m68ec020 + mode. + - Added code to speed up busy waiting on some branch instructions. + - Fixed some bfxxx opcode bugs. + +05-Apr-2000: Musashi 3.0 released + - Major code overhaul. + - Rewrote code generator program and changed the format of + m68k_in.c. + - Added support for m68ec020. + - Removed timing from the opcode handlers. + - Added correct timing for m68000, m68010, and m68020. + Note: 68020 timing is the cache timing from the manual. + - Removed the m68k_peek_xxx() and m68k_poke_xxx() instructions and + replaced them with m68k_get_reg() and m68k_set_reg(). + - Added support for function codes. + - Revamped m68kconf.h to be easier to configure and more powerful. + - Added option to separate immediate and normal reads. + - Added support for (undocumented) m68000 instruction prefetch. + - Rewrote indexed addressing mode handling. + - Rewrote interrupt handling. + - Fixed a masking bug for m68k_get_reg() when requesting the PC. + - Moved the instruction table sorting routine to m68kmake.c so + that it is invoked at compile time rather than at runtime. + - Rewrote the exception handling routines to support different + stack frames (needed for m68020 emulation). + - Rewrote faster status register and condition code flag handling + functions / macros. + - Fixed function code handling to fetch from program space when + using pc-relative addressing. + - Fixed initial program counter and stack pointer fetching on + reset (loads from program space now). + - A lot of code cleanup. + - LOTS of bugfixes (especially in the m68020 code). + +13-May-1999: Musashi 2.2 released + - Added support for m68020. + - Lots of bugfixes. + +25-Mar-1999: Musashi 2.1 released + - Added support for m68010. + - Many bugfixes. + +17-Mar-1999: Musashi 2.0 released + - Major code overhaul. + - Replaced monolithic codebase with a code generator program. + - Added correct m68000 timing. + - Moved timing into the opcode handlers. + +06-Jan-1999: Musashi 1.0 released + +20-Dec-1998: Beta release of Musashi v0.5 that could run Rastan Saga under MAME + (barely). + +04-Dec-1998: Final prototype v0.4 + +20-Nov-1998: First prototype v0.1 + +11-Jun-1998: Early disassembler + +12-May-1998: First outline |