mirror of
https://github.com/Oibaf66/frodo-wii.git
synced 2024-11-22 11:29:24 +01:00
86 lines
3.6 KiB
HTML
86 lines
3.6 KiB
HTML
<HTML>
|
|
<HEAD>
|
|
<TITLE>File access</TITLE>
|
|
</HEAD>
|
|
<BODY>
|
|
|
|
<H1>File access</H1>
|
|
|
|
<HR>
|
|
|
|
Frodo offers four possibilities for the 1541 emulation:
|
|
|
|
<H3>1. Host system directory, setting "Dir"</H3>
|
|
|
|
In this mode, the C64 programs and files are stored in a directory on your
|
|
hard disk and can be <KBD>LOAD</KBD>ed and <KBD>SAVE</KBD>d as usual from
|
|
the emulator. The paths to the directories of the simulated drives are
|
|
given in the settings window in the path entry fields of the "Drives"
|
|
box.<P>
|
|
|
|
You can also load the directory with <KBD>LOAD"$",8</KBD>. All files are
|
|
displayed as "PRG", all subdirectories as "DIR". To get into a
|
|
subdirectory, you have to open the settings window and change the path for
|
|
the drive, as the operating system of the C64 doesn't know about
|
|
subdirectories. However, it is possible to use a "/" in the C64 file name
|
|
to access these subdirectories (e.g. <KBD>LOAD"GAMES/ELITE",8</KBD>),
|
|
unless the '/' translation setting is turned on.<P>
|
|
|
|
For the opening of files, the file types "P" and "S" and the access modes
|
|
"R", "W" and "A" are supported. Wildcards (*,?) can be used, but you have
|
|
to remember that files in BeOS/Unix/AmigaOS directories have no determined order
|
|
and the result of <KBD>LOAD"*",8</KBD> is rather random. Files are always
|
|
overwritten even if they are not opened with "@:". Floppy commands other
|
|
than "I" and "UJ", relative files and direct block access are not
|
|
implemented. You can however read the error channel.<P>
|
|
|
|
|
|
<H3>2. .d64/x64 disk image file, setting "D64"</H3>
|
|
|
|
Most C64 programs available on the Internet and on CD-ROMs, expecially
|
|
demos and games, are stored in files with the ending ".d64". Such a file
|
|
holds all 683 blocks of a complete side of a 1541 disk, so that direct
|
|
block accesses are possible from within the emulation. However, Frodo only
|
|
supports read accesses. The path name of the disk image file must be given
|
|
in the settings window in the path entry fields of the "Drives" box.<P>
|
|
|
|
Apart from .d64 files, Frodo can also use image files of the "x64"
|
|
emulator, automatically detecting the file type.<P>
|
|
|
|
|
|
<H3>3. .t64/LYNX archive file, setting "T64"</H3>
|
|
|
|
.t64 and LYNX (.lnx) files are archive files like "tar". .t64 files are
|
|
also often found on the Internet and on CD-ROMs; LYNX is a native C64
|
|
archiver. Frodo's .t64 support is a bit special in that it doesn't treat
|
|
the .t64 file like a tape image (that's what the .t64 format was designed
|
|
for), but rather like a disk image file. .t64's are not accessed with
|
|
device number 1 (Frodo doesn't have any tape emulation), but with numbers
|
|
8..11 like a disk drive.<P>
|
|
|
|
When loading the directory with <KBD>LOAD"$",8</KBD>, Frodo creates a
|
|
listing of all files within the archive. You cannot write to .t64 or LYNX
|
|
files, they are read-only under Frodo.<P>
|
|
|
|
|
|
<H3>4. Processor-level 1541 emulation</H3>
|
|
|
|
The 1541 is an "intelligent" disk drive bearing its own CPU and memory that
|
|
can even be programmed and execute code concurrently to the C64. Frodo is
|
|
able to emulate a 1541 on this level, but as this slows down the whole
|
|
emulation notably, the 1541 processor emulation can be turned on and off
|
|
from the settings.<P>
|
|
|
|
If the 1541 processor emulation is turned on, the "Dir"/"D64" drives 8..11
|
|
are no longer available. They are replaced by a single drive with number 8
|
|
that operates in "D64" mode (regardless of the state of the type setting
|
|
for drive 8). The path name of the .d64/x64 file to be used must be given
|
|
in the path entry field of drive 8.<P>
|
|
|
|
In contrast to the standard "D64" mode, the 1541 processor emulation is
|
|
able to write to the disk. There is no way to "virtually write-protect" the
|
|
disk image file, so be careful.
|
|
|
|
</BODY>
|
|
</HTML>
|