Added information about commodore formats

Commodore/POWER64.TXT

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+
+*** Power 64 RAM Snapshot File (C64 emulator on Apple Power Macintosh)
+*** Document revision: 1.2
+*** Last updated: March 11, 2004
+*** Compiler/Editor: Peter Schepers
+*** Contributors/sources: Peter Weighill
+
+  These files, similar in nature to  PC64's  .C64  files,  are  a  complete
+memory dump of the 64K RAM, color RAM, and all I/O ports and CPU registers.
+Presently, this format is supported by the  Power64  emulator  and  may  be
+added to future versions of the VICE  emulator.  The  file  size  is  69888
+bytes.
+
+  The format for RAM Snapshots was adapted from a suggestion by Jouko Valta
+for the Vice Emulator on Unix systems.
+
+* Note: All multi-byte values are stored in  big-endian  format  (high/low)
+rather than in the little-endian format (low/high) used by the  C64,  since
+the Macintosh stores values this way.
+
+No sample memory dump is available.
+
+Byte: $00000-00005: Magic Header (at present $43, $42, $4D, $64, $00,  $00)
+                    or "CBM",$64,$00,$00
+       00006-00007: Reserved (should be $00, $00)
+       00008-00009: Version major and minor ($01, $00, or 1.0)
+             0000A: Emulator snapshot ID (Power64 is $2F)
+             0000B: Snapshot type (presently $00)
+       0000C-0000D: Offset in bytes (high/low), to RAM image  in  snapshot.
+                    The header size is presently 256 bytes, so  the  values
+                    are $01, $00.
+       0000E-0000F: RAM image size (in Kbytes, presently $00,  $40,  or  64
+                    Kbytes)
+       00010-00011: REU RAM image size (in Kbytes, presently $00, $00)
+       00012-0001F: Reserved (should be $00, $00)
+       00020-00025: Configuration bit masks (presently all $00)
+             00026: I/O RAM size (Power64 value $01)
+                       Bit 0: I/O data available (0 = no)
+                     1 and 2: Video Display Controller RAM
+                              00 = none
+                              01 = 16 Kb
+                              10 = 64 Kb
+                              11 = 32 Kb)
+             00027: CPU's available (Power64 value $01)
+                    Bit 0: 6502
+                        1: Z80
+                        2: REC
+       00028-00029: 6502 program counter (high/low)
+       0002A-0002C: A, X and Y CPU registers
+             0002D: 6502 flags register
+             0002E: 6502 stack pointer (SP)
+             0002F: 6502 I/O port
+       00030-0003F: Z80 registers (not used yet, should be $00)
+       00040-0004F: REC registers (not used yet, should be $00)
+             00050: C64 kernal ID byte (not used yet)
+             00051: Kernal patch ID for fastloaders, etc. (not used yet)
+       00052-00053: Kernal patch version ID (not used)
+       00054-0007F: Kernal version information (not used yet)
+       00080-000FF: Miscellaneous info on peripherals (not used yet)
+       00100-100FF: 64Kb RAM area (size depends on value in 0000E-0000F)
+       10100-110FF: Contents of the C64 I/O area
+