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APPENDIX 0
DOS 2.5 MEMORY MAP
FOR 64K RAM SYSTEM
000000000000000000
Decimal
65535
49152
49151
32768
32767
var ies
varies
varies
6781
6780
1792
ADDRESS
Hexadecimal
FFFF
COOO
BFFf
BFFF
"
"
NONE
8000
AOoo
7FFF
or
9FFF
or
BFFF
3305
lO7C
1gee
19CB
0700
06FF
480
47F
0
"
•
CONTENTS
OPERATING SYSTEM
16K,
6K
,
or
NO
CARTRIDGE
SCREEN DISPLAY AREA
HIMEM
'
USER
PROGRAM
AREA
DISK UTILITY PROGRAMS (DUP.SYS)
LOMEM
"
Seeior Buffer
4
Sector
Buffer
3
Sector Buffer 2
Secl
or Buffer 1
Drive
8 (RAMDISK)
Buller
Drive
2 Buffer
Drive
1
Buffer
FilE MANAGEMENT
SUBSYSTEM (DOS.5VS)
BUFFER
AREA
RESERVED
FOR
0052.5
VARIES -
most
otten used by languages
(ATARI
BASIC does
not
use
5680
-
56FF).
OPERATING
SYSTEM
(including cassene
buffer)
• Depends on which graphics mode is cu rrently in use
.
•
•
Varies wi,h
the number 01 drive
and
sector buMers reserved
.
•
••
Ponions 01 PAGE
0 ($00
-
$FF)
rna.,.
be available
with
some
languages.
The
Oper.
ating System alone uses only
$00 -
$7F.
Nole
1: For
given
Drive
Buffer allocation
ar"lc\
Sector
Buffer
allocation,
LOMEM
can be
determined
by PEEKing
locations
2E7
(LOW)
and
2E8 (HIGH) Hex
Of
743
(LOW)
and
74
4
(HIGH)
Decimal.
NOli 2:
To
determine the amoonl
01
User Program
Area
available
Of
HIMEM,
you can
either make use
01
the BASIC
FRE(O)
instruction
or PEEKing Locations
2E5
(LOW) and
2E6 (HIGH)
Hex
or
74\
(LOW)
and
742
(HIGH)
Decimal.
101
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