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APPENDIX .J
MDQS 3.00 Differences
with either a 1 MHz or a 2 MHz system.
17.
The
recovery
or
accidentally deleted riles
has
b
ee'n mad e eas
i
er ror
th
ose users
wh
0
refuse
to
keep
directory
listings
or backup copies.
The
director~
entTy is only
changed
so that the
fir~t
t~o
bytes
are
changed
to an
$FF
when deleted.
This retains
8
characters
o~
name and suffix
out
of
the
original
10
to make the
ent~~
visible in
the directory.
In
addition~
the
RIB
is no longer
zero-filled
when
the
rile is deleted.
Thusl
the
user has only to use
DUMP
to
rebuild
the
tUlO
FF-ed
name
bytes
in
the directorlj.
Then,
the
REPAIR program
must
be run immediately afterwards
to reconstruct the allocation table.
J.3
Enhancements to MDOS 3.00
MDOS
3.00
was
released
to
support
EXORdisk
III
(four-drives.
double-sided),
The other major enhancement was
the
addition
of multiple sector
I/O.
The implementation Or
this enhancement has considerably reduced the amount of
time
it
takes
all MDOS commands to execute.
Commands like LIST,
MERGEJ COpy, DOSGEN, and EDIT show the greatest increases
in
speed.
The other enhancements are listed below.
1.
The
BACKUP
command
has
been modiried to allow
single-~ided
diskettes
t o ' be
copi~d
onto
double-Sided
diskettes.
A
logical unit number
specification can
be
entered on the command
line
to
allow copying diskettes from units other than
zero
to
units other than one.
The
IIR
u
option
no
longer
copies the LCAT
~rom
the source diskette.
The destination diskette's
LCAT
is
initialized
completely.
The "V" option no longer terminates
the
veri~y
process
if
the
sqstem
sectors
in
cylinder
zero miscompare since the BREAK key can
be used to abort the
proc~ss
at any time.
2.
The COPY command's
"V"
option
will
cause
the
miscomparisons to be displayed between sectors or
records when verifying files.
The
ilL"
option can
be
used
to
direct
this
display
to
the line
printer.
The
liB
II
option
has
been
added
to
automatically
verif~
riles
after
the copy has
completed (diskette-to-diskette copy only).
3.
The DOSGEN command has been changed allow logical
unit
numbe~
specifications
1-3.
Either
sin~la
or double-sided diskettes can be
DOSGENed.
The
write/read
test
has been changed to veriFy that
the sectors locked out indeed
have
tHe
deleted
data
mark
written
in
them.
The
BREA~
key
is
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