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- SYS documentation by Jeremy Davis
- Updated by Bart Oldeman
-
- SYS's standard behavior is very similar (though in
- my opinion improved) to that of other DOSes.
- SYS (no options) should provide a general usage,
- and SYS CONFIG /help (or SYS CONFIG /?) should
- provide usage for the new configuration options.
-
- Admittedly its brief, but it is there.
- Below is a more detailed documentation on its
- usage (from memory, but I believe it is close to right).
- The best documentation (and maybe only) is the
- source itself.
-
-
- The simplest usage:
-
- SYS dest:
-
- dest should be the drive (A:, B:, C:, ...) you wish
- to be bootable with FreeDOS (kernel & command.com)
- When using this form, KERNEL.SYS and COMMAND.COM
- must reside either in the current directory (which
- is searched first) or in recent revisions may also
- be in the root directory of the current drive.
-
- Complete form:
-
- SYS [source] dest: [bootsect [BOTH]]
-
- Here dest is the same as before, but this time
- you specify where KERNEL.SYS and COMMAND.COM are.
- Source may simply be a drive (in this case it
- is similar to PC & MS SYS). The current directory
- of the specified drive is first searched for
- KERNEL.SYS & COMMAND.COM and if not found then
- the root directory of the specified drive is tried.
- Alternatively, you may specify a path (either fully
- qualified or relative) to where KERNEL.SYS and
- COMMAND.COM may be found; note that this should
- only search this directory and will fail if they
- are not found, ie it will not check for them on
- the root directory of the drive specified when
- a path is given. It should also fail if the
- source and destination drive are both the same
- and would result in trying to SYS from the root
- to the root (ie trying to SYS from C:\ to C:\).
-
- If you specify a name for "bootsect", for instance,
- bootsect.fd, SYS will write to that file instead of
- the real boot sector. You will obtain a 512-byte file
- containing the boot sector, which can then be used
- for dual booting or diagnostic purposes.
-
- If you also specify BOTH, sys will write to both
- the image file and the boot sector.
-
-
- Kernel Configuration Options:
-
- Simplest form:
-
- SYS CONFIG
-
- This will simply display the current settings
- for the file KERNEL.SYS in the current directory.
- It is useful to see what the options are currently
- set to, what options are supported, and should
- show valid values along with defaults (defaults are
- the valid values with a '*' next to them).
-
- Optionally specify file:
-
- SYS CONFIG [drive][path]KERNEL.SYS
-
- This form behaves as above, except will display
- the settings for the kernel file you specify.
- drive and path are optional, and generally just
- a \ will be used to indicate root directory of
- current drive. KERNEL.SYS specifies the filename
- of the kernel, which may not be "KERNEL.SYS",
- for example when testing you want to alter
- KERNTEST.SYS and later copy (or rename) this to
- KERNEL.SYS for booting.
-
-
- Changing options:
-
- SYS CONFIG OPTION1=value [OPTION2=value ...]
-
- This form will read the current settings from
- the kernel (KERNEL.SYS in the current directory)
- and set the options specified to the value given.
- If the value is potentially invalid (too large, too
- small, etc) then a warning will be displayed, but
- the change will still occur. The kernel file is
- only updated if at least one option is different from the
- current settings. If you wish to force the kernel
- file to be written to, then set the same option
- twice (OPTION1=oddvalue OPTION1=desiredvalue), with
- the 1st time the value being different from the
- current one and the rightmost one being the desired
- value. Currently three options are supported.
- Note: currently only the 1st three letters are
- actually checked, so they may be abreviated to
- DLA, SHO, and SKI and with my recent patch you may
- specify the value as either a decimal number 0,10,255,...
- or as a hexidecimal number 0x0,0xA, 0xFF...
-
- DLASORT which may be set to 0 or 1
- DLASORT=0 or DLASORT=1
- This option is for specifying whether Drive Letter
- Assignment should follow the normal MSDOS way of
- all primary partitions across drives and then
- extended partitions, or the more logical
- all partitions (primary & extended) on the 1st
- drive, then repeat for all following drives
- (all primary & extended, then try next drive).
- 0 corresponds to MS way and 1 corresponds to first
- drive completely, then next ...
-
- SHOWDRIVEASSIGNMENT which may be 0 or 1
- SHOWDRIVEASSIGNMENT=0 or SHOWDRIVEASSIGNMENT=1
- If 1 then the normal drive assignment information
- is displayed upon booting. If 0 then this information
- is supressed (not shown).
-
- SKIPCONFIGSECONDS which may be -128 to 127.
- A negative value ( < 0 ) indicates that F5/F8
- processing will be skipped (the kernel won't check
- if you pressed these keys, so you can't skip config
- file (CONFIG.SYS) processing). A 0 means you must
- have pressed the key precisely for when the kernel
- checks for it - essentially skipping, though a well
- timed finger will still get to use it. And any value
- greater than 0 is the number of seconds the kernel will
- display the prompt and wait for you to press the key
- before assuming you didn't.
-
- FORCELBA which may be 0 or 1
- FORCELBA=0 or FORCELBA=1
- If 1 then the kernel will use LBA (extended INT13)
- techniques to address all partitions if possible,
- even if these have a non-LBA partition type and
- are completely below cylinder 1023 (usually the 8GB
- boundary). This is 0 by default, for compatibility
- reasons. Setting this to 1 may bypass some buggy
- BIOSes and gives slightly better performance.
-
- GLOBALENABLELBASUPPORT which maybe 0 or 1
- GLOBALENABLELBASUPPORT=0 or GLOBALENABLELBASUPPORT=1
- If 0 then LBA will be completely disabled, irrespective
- of the FORCELBA setting. You need this if FreeDOS thinks
- you have LBA available, but in reality you do not.
- This setting is set to 1 by default.
-
- Example: To set the kernel in the current directory
- to have a timeout of 5 seconds (default is 2) run
- SYS CONFIG SKI=5
-
-
- Changing options of specified file:
-
- SYS CONFIG [drive][path]KERNEL.SYS OPTION1=value ...]
-
- This is just like previous section on setting options,
- except the first argument after CONFIG specifies which
- kernel file to use. The filename is the same form used
- for displaying options of specified kernel file described
- above.
-
- Example2: To set a kernel in the root directory to
- not show drive assignment and change the timeout
- to never check
- SYS CONFIG \KERNEL.SYS SKI=-1 SHOWDRIVEASSIGNMENT=0x0
-
-