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3. 2. 5 ROM and BASIC
The interface between the BASIC system and ROM is created from a 4
character keyword ("love") and 3 entry addresses.
-
1)
The keyword is created from 4 bytes.
''
"I"
"o"
v
i
i
i
6 CH 6 PH 76H 65H
2)
Entry addresses
address, the control can be moved to that address.
Entry address
3)
1/0
the
control chip and the minimum amount of work area. The
interpreter is masked.
4)
Entry address 1 is the entry address just before when the BASIC system
displays the Copyright message.
5)
Entry address 2 is the entry address when the power is turned on from a
SLEEP condition.
6)
Keyword is scanned from
Address O
0000
''
''e''
i
0
to 2 are created from 2 bytes. By writing in an
0
is the entry address when the BASIC system initializes
2000
Address 1
Address 2
�
Entry addresses
B
H
000 H.
-
-
FFFF
115
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