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Subject: DOSFS: readme
From: DPetrov@misis.msk.su (Dimitry Petrov)
Date: Mon, 15 Mar 93 12:54:43 +0300
Organization: Russian ARM Support Group
DOS FS v. 1.13 (C) Petrov Software
Several years ago I wrote a program allowing to read/write
360K PC disks on BBC B+. Several times I corrected some bugs,
made improvements until I got an access to archimedes. Now I
stopped the future development of the code because I failed to
get any money for this program.
You could freely distribute the DOS FS as *SHAREWARE* product.
If you'll like it and pay me a small registration fee I return to
development of the program and you'll get free upgrades. If not,
you may use the DOS FS only two weeks.
Below is short description of the DOS filing system:
1. Before you begin to work with the DOS FS you'll need the
1) Disk formatted under the DOS:
it MUST have EXACTLY two sectors per cluster, 512 bytes per
sector and 12 bits per FAT entry (for example standard 360K
Disks formatted under some last DOS versions have 1 sector per
cluster. You can still use this disks: manually edit the boot
sector of such disk (for example by means of PCTOOLS of NU). Byte
at offset 13 (&0D) in a boot sector (track 0, side 0, sector 1)
contains the number of sectors per cluster. You'll need to change
it to 2 and write the boot sector back to the disk (NOTE, that
the information on the disk will be lost). Then you must CHKDSK
/f this disk and delete garbage files if any.
2) You'll need the BBC B (with 1770 or 1772 double density
upgrade installed and sideways RAM), B+ or Master 128/Compact.
Perform the following command:
Master 128/Compact BBC B/B+
*Srload DOS360M 8000 <rom> *Srload DOS360B 8000 <rom>
where <rom> is the number of free RAM bank.
(this two ROM images differ mainly
because of different floppy disk controller
addresses and some OS differences)
NOTE: Instead of *Srload ... you can successfully use my own
utility Srl. It works more quickly and automatically
detects the free bank. You have to enter *Srl DOS360M or
*Srl DOS360B accordingly.
NOTE: You must have 40/80 or 40-track disk drive for 360K
3) Press <CTRL BREAK> to initialise DOS filing system.
4) Now you can work with the DOS FS. Below is some details of
- selects the DOS FS as a current filing system.
- this command forgets all information about last DOS disk
with which the DOS FS worked. You must use this command after
changing the DOS disk. Disk must be inserted BEFORE!!!
<drive> may be 1 or B for drive 1, 0 or A for drive 0
If you use 720K disks or drive 1 more frequently, after *Mount
*SrSave DOSFS 8000+<romlength> <rom>
to store the default values for disk format and drive number.
In this case if you just *Srl DOSFS and access disk without
*Mount command, the default values will be used. Be careful
because you can damage disk with different format if you access
it without *Mount.
- when some errors occurs the DOS FS doesn't flush its cache
buffers to the disk. Use this command before removing disk from
the disk drive to ensure DOS FS write its buffers. I've rewritten
some parts of DOS FS and now you can be sure the *DisMount is
needed ONLY if there was some errors (Disk full/write protected,
etc.). But I still recommend you to use this command.
- just swaps locked/unlocked state of files
- doesn't implemented.
- works as usual
- works as usual
- not implemented
- not implemented
How to translate filenames?
DOS name \WAFFLE\DOCS\INSTALL.DOC corresponds to
BBC name .waffle.docs.install/doc (root is not a "$" but just
IMPORTANT: DOS FS doesn't differ small and capital letters,
and so if you will SAVE "SomeProg" you will be able to load it be
means of LOAD "SOMEPROG" or LOAD "SoMePrOg". But remember that PC
DOS requires all names must be in capitals!
*CAT works not only with directories but also with files, for
will display all files in directory \WAFFLE\DOCS
will display all files with the DOC-extension in the same
*Ex and *Info work in the same manner but give more
information on items.
*Delete/*Remove supports * and # but removes only the first
occurence of the matched object.
DOS FS supports also both Load and Exec addresses so you can
for example *Run machine code programs or *Load File to its
default Load address. Unfortunately it doesn't supports file
datestamps in this version.
*Rename - unfortunately doesn't implemented
*Save/*Load/OPENIN/OPENOUT/OPENUP/CLOSE - implemented OSGBPB -
implemented except for reading filenames, etc.
DOS FS contains several errors (known to me) but I am still
sure you'll be able to use it without problems.
Any questions/suggestions, etc. to e-mail:
or snail mail:
Kavkazsky Boulevard, 29
Bld. 1, Flat 107.
DPetrov@misis.msk.su (Dimitry Petrov)
Russian ARM Support Group