Lines 399 - 359 The user is prompted to enter his answer in the form
of
a sequence
of
L keys. The tone is heard
as
each key
is
pressed (Line 324). A flag
is
set
(C
=
1)
if
a key
is
pressed out
of
sequence (Line 340).
Lines 369.- 519 The flag (C) is checked to determine
if
the user's answer was correct
or not. The
numQer
of
correct responses (NC) is incremented if the answer was
correct.
Lines 699 - 630 The correct sequence
of
tones
is
replayed to provide feedback to the
user. Note the use
of
FOR/NEXT loops (Lines 600 and 620) to cause a short pause
between tones.
Lines 632 - 740 The score
is
computed and displayed. Note that the score
is
added to
the cumulative score (LAST) from any previous level
of
play. The user
is
allowed
to
continue playing at the current level, change the difficulty level
or
stop the game. Any
other response will result in the prompt being redisplayed (Line 740).
Lines 808 - 879 This section of the program lets the user listen to the tones associated
with the number keys
(1
through 9). When any key other than a number key is
pressed, execution jumps back to the beginning of the program.
Line
1M
This subroutine continuously scans the keyboard (A$ = INKEY$) and waits
for a key to be pressed (A$ will be null until a key
is
pressed). When a key
is
pressed, it will
be
stored in the string variable
A$
and displayed before execution
returns.
Lines
28M
- 29288 This subroutine displays the instructions. A subroutine (GOSUB
30000) is repeatedly called to wait for a key to continue the instructions.
Lines
38_
- 39929 This subroutine displays a prompt to remind you
to
press any
key to continue the instructions.
It
also calls a subroutine (GOSUB 1000)
to
wait for
any key to
be
pressed before returning.
193
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