Appendix
JI
BASIC Memory Map
0000H to 25FFH Operating System Reserved for
TRSDOS
operations.
2600H to 2FFFH
Overlay Area Used alternately
by
TRSDOS
and BASIC. Whenever you use
a
TRSDOS
library command,
TRSDOS uses this area to
store the program that will
perform the command. BASIC
reloads this area with its data
when you return from
TRSDOS.
3000H to 85FFH BASIC
Reserved for BASIC.
8600H to
User's BASIC Reserved for your
Bottom of Stack
Program
programs, variables, strings,
and arrays.
Bottom of
BASIC stack and
Contains the stack used by
Stack to HIGH$
File Control BASIC and the File Control
or User-Defined Block(s)
Block(s) (FCBs). Each FCB
top of memory
requires 564 bytes
of
(M)
storage. The number of FCBs
that your system has is
~-
selected with the command:
BASIC (F
= n), where 'n'
specifies the number of files
that can be open at
anyone
time. (One additional 564-byte
block is always allocated and is
reserved for use by BASIC.)
User-Defined Assembly
This area exists only if you
top of memory
language routines
create it with the command,
(M) or HIGH$
callable from
BASIC (M
= address) where
to HIGH$
BASIC.
'address' specifies the last
address that BASIC will use.
The area between
"M"
and
HIGH$ is used to store
assembly language routines
that are called
by
BASIC
programs.
A-101
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