forked from KolibriOS/kolibrios
115 lines
5.2 KiB
Plaintext
115 lines
5.2 KiB
Plaintext
The history of Musashi for anyone who might be interested:
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Musashi was born out of sheer boredom.
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I needed something to code, and so having had fun with a few of the emulators
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around, I decided to try my hand at CPU emulation.
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I had owned an Amiga for many years and had done some assembly coding on it so
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I figured it would be the ideal chip to cut my teeth on.
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Had I known then how much work was involved in emulating a chip like this, I
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may not have even started ;-)
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12-May-1998: First outline
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11-Jun-1998: Early disassembler
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20-Nov-1998: First prototype v0.1
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04-Dec-1998: Final prototype v0.4
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20-Dec-1998: Beta release of Musashi v0.5 that could run Rastan Saga under MAME
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(barely).
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06-Jan-1999: Musashi 1.0 released
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17-Mar-1999: Musashi 2.0 released
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- Major code overhaul.
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- Replaced monolithic codebase with a code generator program.
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- Added correct m68000 timing.
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- Moved timing into the opcode handlers.
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25-Mar-1999: Musashi 2.1 released
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- Added support for m68010.
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- Many bugfixes.
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13-May-1999: Musashi 2.2 released
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- Added support for m68020.
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- Lots of bugfixes.
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05-Apr-2000: Musashi 3.0 released
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- Major code overhaul.
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- Rewrote code generator program and changed the format of
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m68k_in.c.
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- Added support for m68ec020.
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- Removed timing from the opcode handlers.
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- Added correct timing for m68000, m68010, and m68020.
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Note: 68020 timing is the cache timing from the manual.
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- Removed the m68k_peek_xxx() and m68k_poke_xxx() instructions and
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replaced them with m68k_get_reg() and m68k_set_reg().
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- Added support for function codes.
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- Revamped m68kconf.h to be easier to configure and more powerful.
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- Added option to separate immediate and normal reads.
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- Added support for (undocumented) m68000 instruction prefetch.
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- Rewrote indexed addressing mode handling.
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- Rewrote interrupt handling.
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- Fixed a masking bug for m68k_get_reg() when requesting the PC.
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- Moved the instruction table sorting routine to m68kmake.c so
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that it is invoked at compile time rather than at runtime.
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- Rewrote the exception handling routines to support different
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stack frames (needed for m68020 emulation).
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- Rewrote faster status register and condition code flag handling
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functions / macros.
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- Fixed function code handling to fetch from program space when
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using pc-relative addressing.
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- Fixed initial program counter and stack pointer fetching on
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reset (loads from program space now).
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- A lot of code cleanup.
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- LOTS of bugfixes (especially in the m68020 code).
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28-May-2000: Musashi 3.1 released
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- Fixed bug in m68k_get_reg() that retrieved the wrong value for
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the status register.
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- Fixed register bug in movec.
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- Fixed cpu type comparison problem that caused indexed
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addressing modes to be incorrectly interpreted when in m68ec020
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mode.
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- Added code to speed up busy waiting on some branch instructions.
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- Fixed some bfxxx opcode bugs.
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14-Aug-2000: Musashi 3.2 released
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- Fixed RTE bug that killed the program counter when in m68020
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mode.
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- Minor fixes in negx and nbcd.
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- renamed d68k.c to m68kdasm.c and merged d68k.h into m68k.h.
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d68k_read_xxx() instructions have been renamed to
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m68k_read_xxx_disassembler().
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- Rewrote exception processing and fixed 68020 stack frame
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problems.
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- FINALLY fixed the mull and divl instructions.
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- Added 64-bit safe code fixes.
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- Added 64-bit optimizations (these will only be ANSI compliant
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under c9x, and so to use them you must turn on M68K_USE_64_BIT
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in m68kconf.h).
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27-Jan-2001: Musashi 3.3 released
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Note: This is the last release of Musashi before I separate the
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68020 core.
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- Fixed problem when displaying negative numbers in disassembler
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- Fixed cpu type selector - was allowing 020 instructions to be
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disassembled when in 000 mode.
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- Fixed opcode jumptable generator (ambiguous operators in the
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test for f-line ops)
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- Fixed signed/unsigned problem in divl and mull opcodes (not
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sure if this was causing an error but best to be sure)
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- Cleaned up the naming scheme for the opcode handlers
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02-Feb-2001: Musashi 3.3.1 released
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Note: due to the pc-relative requirement for some new drivers
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in MAME, I've released this small update.
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- Added pc-relative read modes
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- small optimizations to the exception handling that will help
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when splitting the cores
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- Updated the example (oops!)
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