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APPENDIXG
HOW TO
TELL
DOS
HOW MANY
DISK DRIVES
YOG
HAVE
000000000000000000
This
appendix explains how to change the RAM
location
num-
ber to reflect the number of drives attached to your ATARI Com-
puter
system.
(See Appendix
L,
the
SETUP.COM section.) If you
are using more than two drives (the default
maximum),
you will
need to poke the correct drive number code into RAM location
1802
(decimal).
The
following table gives the correct entries for
the number of AlARI 610 or XF551 Disk Drives. Note that a maxi-
mum of four disk drives can be used with DOS 2.5 since the
switches on each drive can only be set from 1 to
4.
Note also
that in the
Binary
Drive
Code,
there is a
1
corresponding to each
drive in the
system.
CODES FOR NUMBER OF
DISK DRIVES ATTATCHED
Decimal
Binary
Drives Allocated
Drive Code
Drive Code
Drive 1
01
00000001
Drive 2
02
00000010
Drive 3
O.
00000100
Drive 4
08
00001000
Drives
1
+ 2
03
00000011
(default)
Drives
1 + 2 + 3
07
00000111
Drives1+2+3+4
15
00001111
So to tell
DOS
thaI you have three disk
drives,
for example, you
would use POKE
1802,
7.
To alter the version of
DOS
slored on diskette so that your cus·
tom
version will always boot in
,
simply type
DOS
and press
I
RetI.rn );
then use the
H.
option (WRITE DOS FILES) from the
DOS Menu
to
store your
new
version of
DOS
on your diskette.
107
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