Atari XL

166
The Afar; XL Handbook
70 GRAPHICS 0
80 FOR Z=O TO 23
90 PRINT LST(Z)jU uj:NEXT Z
The display instructions are stored in the array
LST( ), and are displayed on a mode 0 screen. This
is what you should see (the data is shown here in a
list for clarity - not as it appears on the screen):
112 8 blank scan lines
112 8 blank scan lines
112 8 blank scan lines
71 7 + 64 -1 mode 2 display block
112 Display memory at
62 112 + 62*256
7 Mode 2 display block
7 Mode 2
display block
7 Mode 2 display block
7 Mode 2
display block
7 Mode 2
display block
7 Mode 2
display block
7 Mode 2
display block
7 Mode 2
display block
7 Mode 2
display block
66 2 + 64 -1 mode 0 display block
96 Display memory at
63 96 + 63*256
2 Mode 0 display block
2 Mode 0
display block
2 Mode 0
display block
65
Jump back to
88 88 + 62*256
62 at Vertical Blank
This display list is more complex than that
examined previously, but you should be able to see
that it specifies 10 mode 2 display blocks, followed
by four mode 0 display blocks. The thing to note is
that there are two different pointers to display