*** FRZ (C64s saved-session FRoZen files) *** Document revision: 1.3 *** Last updated: March 11, 2004 *** Compiler/Editor: Peter Schepers *** Contributors/sources: Miha Peternel 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. The only file which can hold FRZ files is a T64, as its directory/filetype values allow for it. These files (up to C64s V2.0), when converted to raw binaries, are 66806 bytes large. 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F ----------------------------------------------- 00000: 00 00 .. .. .. .. .. .. .. .. .. .. .. .. .. .. <- Load Address ... 00000: .. .. 2F 47 00 AA B1 91 B3 00 00 00 00 00 00 FF <- 64k main RAM 00010: 00 00 00 40 02 00 BE 00 19 16 00 00 C9 9E 00 00 00020: 00 00 00 00 40 02 69 00 00 00 03 00 00 01 08 2A 00030: 3A A8 3A AA 4D C9 9E C9 9E 00 A0 BE 00 00 00 D9 ... 10000: .. .. 01 01 01 01 01 01 01 01 01 01 01 01 01 01 <- Color RAM 10010: 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 10020: 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 10030: 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 ... 10400: .. .. F1 B0 F1 01 69 20 3A 00 00 00 00 00 00 00 <- I/O 10410: 00 00 00 00 00 00 00 00 00 00 00 9B 37 00 00 00 10420: 08 00 15 0F F0 00 00 00 00 00 00 00 01 02 03 04 10430: 00 01 02 03 04 05 06 07 4C 00 00 00 00 00 00 00 ... Bytes:$00000-00001: Load address (always $00 $00) 00002-10001: Main 64k RAM ($0000-FFFF) 10002-10401: Color RAM ($D800-DBFF) 10402-10409: CPU registers (8 bytes) in the following order: - PC (Program Counter, 2 bytes), - SP (Stack Pointer, 2 bytes), - A (Accumulator, 2 bytes) - X/Y (X and Y registers, 2 bytes) 1040A-10438: VIC-II ($D000, 47 bytes) 10439-10455: SID ($D400, 29 bytes) 10456-10465: CIA #1 ($DC00, 16 bytes) 10466-10475: CIA #2 ($DD00, 16 bytes) 10476-104F5: CPU Task data (128 bytes), containing: - Shadow registers - Emulation Registers Seeing as each emulator uses its own format for its "snapshot" files, there is no simple conversion method to take one snapshot (i.e. a PC64 .C64 file) and convert it to another emulator snapshot format (i.e. a C64s FRZ file). The only commonalities would be the main 64k RAM and color RAM areas, whereas the rest of the file would be quite different.