Hi all,
Manuel Bilderbeek <[EMAIL PROTECTED]> wrote:
> (...)
> I thought CALL SYSTEM can only boot from the A drive? (No matter
> what the actual drive is.)
No, you can boot from any drive in both DOS 1&2. The procedure
depends on DOS version:
DOS1 boots -always- from the default drive, but upon _SYSTEM the
bootsector (in which the code for loading "MSXDOS.SYS") is always
read from drive A:
So if your default drive is B, and containing MSXDOS.SYS &
COMMAND.COM, and you give _SYSTEM, it still won't work if there's
nothing in drive A: at that time.
I've used 2 fixes for this in the past:
-a modified diskROM that also reads the bootsector from the default
drive
-or a little proggie, known as "BOOTX" (attached to diz mail)
This intercepts the bootsektor-reading after _SYSTEM, redirecting
this to the selected drive.
Changing default-drive in DOS1 is easy:
POKE 62023,drive with drive: 0=A, 1=B, etc.
or POKE &HF247,drive if you prefer hex...
After _SYSTEM, DOS2 will always try first to boot from the same drive
it booted from earlier. If that fails, it then tries to boot from the
default-drive (bootsektor not used for boot-code anymore, only for
deciding disk type).
If you want to boot from another drive (and from there on?), you can
do this as follows:
1) copy MSXDOS2.SYS & COMMAND2.COM to that drive
2) select this as default-drive:
_chdrv("d:") with d: = a: to h:
3) make sure the drive the system booted from earlier (or A:) is not
available, by removing the disk or so (when using a harddisk, I used
to switch off its powersupply)
4) _system
Greetings (and to you too, Sander Zuidema ! ;-))
.....yep, this guy is a musical genius indeed....
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx MSX Tech Doc page
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---- File information -----------
File: BOOTX.BAS
Date: 4 Feb 1999, 3:38
Size: 669 bytes.
Type: Text
BOOTX.BAS
