Sharp MZ-700 Series Owner's Manual page 94

2.8.1 LIMIT
(Abbreviated format: LIM.)
Format
Function
Example
LIMIT ad
ad Address; either a decimal number from 0 to 65279 or a 4-digit hexa-
decimal number from $0000 to $FEFF.
This statement limits the memory area which can be used by the BASIC interpreter,
ad indicates the upper limit of the BASIC area, and the area from the following
address (ad + 1) to $FEFF (65279) can be used for machine language programs or
special data.
LIMIT $AFFF
Limits the BASIC program area to $AFFF.
Note The area from $FF00 to $ F F F F is used by the monitor as a work area, so it
cannot be used as the user area. The LIMIT statement must be used at the
beginning of a BASIC program.
$ BOOO
S F E F F
Monitor
BASIC interpreter
BASIC
program area
User area
• L I M I T $ A F F F
Use LIMIT MAX to cancel the limit set by LIMIT ad.
2.8.2 POKE
Format
Function
Example
POKE ad, d
POKE@ ad, d
ad Address: either a decimal number from 0 to 65535 or a hexadecimal num-
ber from $0000 to $FFFF.
d Data to be written: a decimal number (0 to 255) or hexadecimal number
($00 to $FF)
This statement writes data byte d to address ad.
The POKE statement can write data to any memory location, regardless of the limit
setting by the LIMIT statement. Therefore, careless use of this statement can
destroy the monitor or BASIC interpreter.
The POKE@ format is used to write data to an address in the user RAM area follow-
ing 53248 ($D000). (See page 125.)
P O K E S D 0 0 0 , S 5 F
P O K E 5 3 2 4 8 . 9 5
The two statements above perform the same funcition.
Note A POKE statement specifying an address after $D000 writes data into the
video RAM area.
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