Sharp MZ-700 Owner's Manual page 94

2.8.1
I
LIMIT
Format
I
Function
Example
2.8.2 POKE
Format
Function
Example
....................................................................... (Abbreviated format: LIM.)
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 $FFOO to $FFFF 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.
Monitor
BASIC interpreter
BASIC
program area
$8 000
$ FEFF
r----- - - ----1+--L I M IT $A FFF
User area
Use LIMIT MAX to cancel the limit set by LIMIT ad.
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 $FF)
This statement writes data byte d to address ad.
The POKE statement can write data to any memory location, regardless of the limit
setting by the LIMIT statement. Therefore, careless use of this statement can
destroy the monitor or BASIC interpreter.
The POKE@ format is used to write data to an address in the user RAM area follow-
ing 53248 ($DOOO). (See page 125.)
POKE $0000 . $5F
PO KE 53248. 95
The two statements above perform the same funcition.
Note A POKE statement specifying an address after $DOOO writes data into the
video RAM area.
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