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DOS 2.0S
DOS2.5
Start of Buffers
$1A7C
$19CC
Bytes
per
Drive Buffer
$80 (128)
$90 (144)
Bytes
per
File Buffer
$80 (128)
$90
(144)
LOMEM
Value,
$1CFC
$1C6C
2
Drives,
3 Files
LOMEM
Value,
$1D7C
$1CFC
3
Drives,
3 Files
LOMEM Value
$1D7C
$1 DOC
4
Drives,
2 Files
Bottom of DUPSVS
$1D7C
$1D7C
As you can see from this chart
,
the controlling location is $1CFC
,
which DOS 2.08 uses
for
LOM EM when DOS is configured for
two drives and three
files.
DOS 2.5 ensures
that
identical value
for three drives and three files because it is expected that a nor-
mal ATA
RI
system configuration might consist of two disk drives
connected to an Atari 130XE
Computer,
which allows the use
of
a
RamDisk.
Since
even
a Ram Disk requires a drive
buffer,
it has to
be accounted for
in
configuring for the
" magic"
value of LOMEM
.
109
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