Sat, 19 Apr 2014 02:19:39 -0600
fixed timing on OSes that set a minimum time for sleeps (previously the main loop code assumed no minimum sleep time; the new version uses longer sleeps less frequently)
1 The history of Musashi for anyone who might be interested:
2 ---------------------------------------------------------
4 Musashi was born out of sheer boredom.
5 I needed something to code, and so having had fun with a few of the emulators
6 around, I decided to try my hand at CPU emulation.
7 I had owned an Amiga for many years and had done some assembly coding on it so
8 I figured it would be the ideal chip to cut my teeth on.
9 Had I known then how much work was involved in emulating a chip like this, I
10 may not have even started ;-)
14 12-May-1998: First outline
16 11-Jun-1998: Early disassembler
18 20-Nov-1998: First prototype v0.1
20 04-Dec-1998: Final prototype v0.4
22 20-Dec-1998: Beta release of Musashi v0.5 that could run Rastan Saga under MAME
23 (barely).
25 06-Jan-1999: Musashi 1.0 released
27 17-Mar-1999: Musashi 2.0 released
28 - Major code overhaul.
29 - Replaced monolithic codebase with a code generator program.
30 - Added correct m68000 timing.
31 - Moved timing into the opcode handlers.
33 25-Mar-1999: Musashi 2.1 released
34 - Added support for m68010.
35 - Many bugfixes.
37 13-May-1999: Musashi 2.2 released
38 - Added support for m68020.
39 - Lots of bugfixes.
41 05-Apr-2000: Musashi 3.0 released
42 - Major code overhaul.
43 - Rewrote code generator program and changed the format of
44 m68k_in.c.
45 - Added support for m68ec020.
46 - Removed timing from the opcode handlers.
47 - Added correct timing for m68000, m68010, and m68020.
48 Note: 68020 timing is the cache timing from the manual.
49 - Removed the m68k_peek_xxx() and m68k_poke_xxx() instructions and
50 replaced them with m68k_get_reg() and m68k_set_reg().
51 - Added support for function codes.
52 - Revamped m68kconf.h to be easier to configure and more powerful.
53 - Added option to separate immediate and normal reads.
54 - Added support for (undocumented) m68000 instruction prefetch.
55 - Rewrote indexed addressing mode handling.
56 - Rewrote interrupt handling.
57 - Fixed a masking bug for m68k_get_reg() when requesting the PC.
58 - Moved the instruction table sorting routine to m68kmake.c so
59 that it is invoked at compile time rather than at runtime.
60 - Rewrote the exception handling routines to support different
61 stack frames (needed for m68020 emulation).
62 - Rewrote faster status register and condition code flag handling
63 functions / macros.
64 - Fixed function code handling to fetch from program space when
65 using pc-relative addressing.
66 - Fixed initial program counter and stack pointer fetching on
67 reset (loads from program space now).
68 - A lot of code cleanup.
69 - LOTS of bugfixes (especially in the m68020 code).
71 28-May-2000: Musashi 3.1 released
72 - Fixed bug in m68k_get_reg() that retrieved the wrong value for
73 the status register.
74 - Fixed register bug in movec.
75 - Fixed cpu type comparison problem that caused indexed
76 addressing modes to be incorrectly interpreted when in m68ec020
77 mode.
78 - Added code to speed up busy waiting on some branch instructions.
79 - Fixed some bfxxx opcode bugs.
81 14-Aug-2000: Musashi 3.2 released
82 - Fixed RTE bug that killed the program counter when in m68020
83 mode.
84 - Minor fixes in negx and nbcd.
85 - renamed d68k.c to m68kdasm.c and merged d68k.h into m68k.h.
86 d68k_read_xxx() instructions have been renamed to
87 m68k_read_xxx_disassembler().
88 - Rewrote exception processing and fixed 68020 stack frame
89 problems.
90 - FINALLY fixed the mull and divl instructions.
91 - Added 64-bit safe code fixes.
92 - Added 64-bit optimizations (these will only be ANSI compliant
93 under c9x, and so to use them you must turn on M68K_USE_64_BIT
94 in m68kconf.h).
96 27-Jan-2001: Musashi 3.3 released
97 Note: This is the last release of Musashi before I separate the
98 68020 core.
99 - Fixed problem when displaying negative numbers in disassembler
100 - Fixed cpu type selector - was allowing 020 instructions to be
101 disassembled when in 000 mode.
102 - Fixed opcode jumptable generator (ambiguous operators in the
103 test for f-line ops)
104 - Fixed signed/unsigned problem in divl and mull opcodes (not
105 sure if this was causing an error but best to be sure)
106 - Cleaned up the naming scheme for the opcode handlers
108 02-Feb-2001: Musashi 3.3.1 released
109 Note: due to the pc-relative requirement for some new drivers
110 in MAME, I've released this small update.
111 - Added pc-relative read modes
112 - small optimizations to the exception handling that will help
113 when splitting the cores
114 - Updated the example (oops!)