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Revision: 1.2
Committed: 2010-04-25T11:52:11Z (12 years, 7 months ago) by cebix
Content type: text/html
Branch: MAIN
CVS Tags: HEAD
Changes since 1.1: +18 -24 lines
Log Message:
documentation update

File Contents

# Content
1 <HTML>
2 <HEAD>
3 <TITLE>File access</TITLE>
4 </HEAD>
5 <BODY>
6
7 <H1>File access</H1>
8
9 <HR>
10
11 Frodo offers four possibilities for the 1541 emulation:
12
13 <H3>1. Host system directory (Directory Mode)</H3>
14
15 In this mode, the C64 programs and files are stored in a directory on your
16 hard disk and can be <KBD>LOAD</KBD>ed and <KBD>SAVE</KBD>d as usual from
17 the emulator. The paths to the directories of the simulated drives are
18 given in the settings window in the path entry fields of the "Drives"
19 box.<P>
20
21 You can also load the directory with <KBD>LOAD"$",8</KBD>. All files are
22 displayed as "PRG", all subdirectories as "DIR". To get into a
23 subdirectory, you have to open the settings window and change the path for
24 the drive, as the operating system of the C64 doesn't know about
25 subdirectories. However, it is possible to use a "/" in the C64 file name
26 to access these subdirectories (e.g. <KBD>LOAD"GAMES/ELITE",8</KBD>),
27 unless the '/' translation setting is turned on.<P>
28
29 For the opening of files, the file types "P" and "S" and the access modes
30 "R", "W" and "A" are supported. Wildcards (*,?) can be used, but you have
31 to remember that files in BeOS/Unix/AmigaOS directories have no determined
32 order and the result of <KBD>LOAD"*",8</KBD> is rather random. Files are
33 always overwritten even if they are not opened with "@:". Floppy commands
34 other than "I" and "UJ", relative files and direct block access are not
35 implemented. You can however read the error channel.<P>
36
37
38 <H3>2. .d64/x64 disk image file (Disk Image Mode)</H3>
39
40 Most C64 programs available on the Internet and on CD-ROMs, expecially demos
41 and games, are stored in files with the ending ".d64". Such a file holds all
42 683 blocks of a complete side of a 1541 disk, so that direct block accesses
43 are possible from within the emulation. The path name of the disk image file
44 must be given in the settings window in the path entry fields of the
45 "Drives" box.<P>
46
47 Apart from .d64 files, Frodo can also use image files of the "x64" emulator,
48 automatically detecting the file type.<P>
49
50
51 <H3>3. .t64/LYNX archive file (Tape/Archive Mode)</H3>
52
53 .t64 and LYNX (.lnx) files are archive files like "tar". .t64 files are
54 also often found on the Internet and on CD-ROMs; LYNX is a native C64
55 archiver. Frodo's .t64 support is a bit special in that it doesn't treat
56 the .t64 file like a tape image (that's what the .t64 format was designed
57 for), but rather like a disk image file. .t64's are not accessed with
58 device number 1 (Frodo doesn't have any tape emulation), but with numbers
59 8..11 like a disk drive.<P>
60
61 When loading the directory with <KBD>LOAD"$",8</KBD>, Frodo creates a
62 listing of all files within the archive. You cannot write to .t64 or LYNX
63 files, they are read-only under Frodo.<P>
64
65
66 <H3>4. Processor-level 1541 emulation</H3>
67
68 The 1541 is an "intelligent" disk drive bearing its own CPU and memory that
69 can even be programmed and execute code concurrently to the C64. Frodo is
70 able to emulate a 1541 on this level, but as this slows down the whole
71 emulation notably, the 1541 processor emulation can be turned on and off
72 from the settings.<P>
73
74 If the 1541 processor emulation is turned on, only drive number 8 in Disk
75 Image Mode is available. The path name of the .d64/x64 file to be used must
76 be given in the path entry field of drive 8.<P>
77
78 </BODY>
79 </HTML>