Subject: How ROM knowns wheter a disk is bootable
I have a little technical question: How does Sam ROM know whether the file
no.01 is DOS, or not? It doesn't blindly load anything there, is it? Does
bootable disk have some special contents in track 0, sector 1? Or possibly
the special contents
Ignore me - I didn't read your question properly.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Aley Keprt
Sent: 13 January 2005 01:32
To: sam-users@nvg.ntnu.no
Subject: How ROM knowns wheter a disk is bootable
I have a little technical question: How
I have a little technical question: How does Sam ROM know whether the file
no.01 is DOS, or not? It doesn't blindly load anything there, is it? Does
bootable disk have some special contents in track 0, sector 1? Or possibly
the special contents are at track 4, sector 1? (I'd expect there is
On Jan 13, 2005, at 1:31 am, Aley Keprt wrote:
I have a little technical question: How does Sam ROM know whether the
file no.01 is DOS, or not? It doesn't blindly load anything there, is
it? Does bootable disk have some special contents in track 0, sector
1? Or possibly the special contents
I have a little technical question: How does Sam ROM know whether the file
no.01 is DOS, or not?
track 4 sector 1, offset $0100 the word BOOT bits 7 and 5 of each char is
ignored
If it finds it sector which was loaded at 8000 will be executed 8009 as
the first 9 are part of
(inherited from
] - www.cs.vsb.cz
--
- Original Message -
From: Edwin Blink [EMAIL PROTECTED]
To: sam-users@nvg.ntnu.no
Sent: Thursday, January 13, 2005 2:50 AM
Subject: Re: How ROM knowns wheter a disk is bootable
I have a little technical question: How does
]
To: sam-users@nvg.ntnu.no
Sent: Thursday, January 13, 2005 2:50 AM
Subject: Re: How ROM knowns wheter a disk is bootable
I have a little technical question: How does Sam ROM know whether the
file
no.01 is DOS, or not?
track 4 sector 1, offset $0100 the word BOOT bits 7 and 5 of each char
On Thu, 13 Jan 2005 06:38:06 +0100 Aley Keprt [EMAIL PROTECTED] wrote:
Oh, and does it mean that I can have SAMDOS at arbitrary directory slot as
long as its body occupies tracks 4 and 5? If you say that ROM loads directly
track 4... :-)
The SAM ROM only loads the sector at track 4, sector 1
On Thu, 13 Jan 2005 06:27:31 +0100 Aley Keprt [EMAIL PROTECTED] wrote:
Thank you (thanks to Andrew Collier as well).
So what's GDOS? A system software from MGT's ZX Spectrum disk interface
Disciple or Plus D?
GDOS - Disciple
G+DOS - +D
(What does the G stand for?)
I'd like to know what
--- Frode Tenneboe [EMAIL PROTECTED]
wrote:
On Thu, 13 Jan 2005 06:27:31 +0100 Aley Keprt
[EMAIL PROTECTED] wrote:
Thank you (thanks to Andrew Collier as well).
So what's GDOS? A system software from MGT's ZX
Spectrum disk interface
Disciple or Plus D?
GDOS - Disciple
G+DOS - +D
--- hookares [EMAIL PROTECTED]
wrote:
--- Frode Tenneboe [EMAIL PROTECTED]
GDOS - Disciple
G+DOS - +D
(What does the G stand for?)
Gordon - as in Brucey
On Thu, 13 Jan 2005 06:38:06 +0100 Aley Keprt [EMAIL PROTECTED] wrote:
Oh, and does it mean that I can have SAMDOS at arbitrary directory slot
as
long as its body occupies tracks 4 and 5? If you say that ROM loads
directly
track 4... :-)
The SAM ROM only loads the sector at track 4, sector 1
On Thu, 13 Jan 2005 11:31:42 +0100 Aley Keprt [EMAIL PROTECTED] wrote:
Please read again what I suggested. If you say that Sam ROM reads just track
4 sector 1, it means that I AM correct. Yet again, if you say that Sam ROM
doesn't know about directory, that means I AM correct.
Ah. Sorry.
From: Frode Tenneboe [EMAIL PROTECTED]
But you could put the rest of the DOS anywhere you like on the disc. Cookie
did that to good effect in MaxiDOS/QDOS where he put the DOS on tracks
80-82.
Just side one
BTW if you wish you could store DOS anywhere into the directory as long as
there is one
Frode Tenneboe wrote:
On Thu, 13 Jan 2005 11:31:42 +0100 Aley Keprt [EMAIL PROTECTED] wrote:
Please read again what I suggested. If you say that Sam ROM reads
just track 4 sector 1, it means that I AM correct. Yet again, if you
say that Sam ROM doesn't know about directory, that means I AM
@nvg.ntnu.no
Sent: Thursday, January 13, 2005 1:11 PM
Subject: Re: How ROM knowns wheter a disk is bootable
From: Frode Tenneboe [EMAIL PROTECTED]
But you could put the rest of the DOS anywhere you like on the disc.
Cookie
did that to good effect in MaxiDOS/QDOS where he put the DOS on tracks
80-82
On Thu, 2005-01-13 at 13:05, Aley Keprt wrote:
What procedure uses the regular SAMDOS2 to load
itself? It uses the standard procedure? I mean does it check two last bytes
of each sector to find the next one? I am suspicious about this. As fas as I
remember sometimes I had hard times trying
On Thu, 2005-01-13 at 12:11, Edwin Blink wrote:
BTW if you wish you could store DOS anywhere into the directory as long as
there is one slot before it that has both filetype and 1st char of filename
zero to mark
end of directory.
I seem to remember that SAMDOS needs to find a whole sector
From: Andrew Collier [EMAIL PROTECTED]
I seem to remember that SAMDOS needs to find a whole sector clear, so
you'd need two empty entries. (Or perhaps it only checked for the zero
marker at the start of the zero marker, and not 256 bytes in.)
Just the first two bytes
try this funny thing:
On Thu, 13 Jan 2005 13:14:04 + Andrew Collier [EMAIL PROTECTED] wrote:
On Thu, 2005-01-13 at 13:05, Aley Keprt wrote:
What procedure uses the regular SAMDOS2 to load
itself? It uses the standard procedure? I mean does it check two last bytes
of each sector to find the next one? I am
On Thu, 13 Jan 2005 13:11:45 +0100 Edwin Blink [EMAIL PROTECTED] wrote:
Just side one.
Tracks are always on just one of the sides. Cylinders are on
both (or all, for multi platter devices). :)
-Frode
--
^ Frode Tennebø | email: [EMAIL PROTECTED] ^
| Ericsson AS |
On Thu, Jan 13, 2005 at 03:14:06PM +0100, Frode Tenneboe wrote:
On Thu, 13 Jan 2005 13:11:45 +0100 Edwin Blink [EMAIL PROTECTED] wrote:
Just side one.
Tracks are always on just one of the sides. Cylinders are on
both (or all, for multi platter devices). :)
On the SAM, cylinder isn't a
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