APPENDIX EIGHT



 48       30     --       4     --     --    4 blank lines
 64       40     --       5     --     --    5 blank lines
 80       50     --       6     --     --    6 blank lines
 96       60     --       7     --     --    7 blank lines
112       70     --       8     --     --    8 blank lines
                                             Display instructions
  2        2      0       8     40     40    text mode 0
  3        3     --      10     40     40    text mode *
  4        4     --       8     40     40    text mode *
  5        5     --      16     40     40    text mode *
  6        6      1       8     20     20    text mode l
  7        7      2      16     20     20    text mode 2

  8        8      3       8     40     10    graphics mode 3
  9        9      4       4     80     10    graphics mode 4
 10        A      5       4     80     20    graphics mode 5
 11        B      6       2    160     20    graphics mode 6
 12        C     --       1    160     20    graphics mode *
 13        D      7       2    160     40    graphics mode 7
 14        E     --       1    160     40    graphics mode *
 15        F      8       1    320     40    graphics mode 8
                                             Jump instructions
                                             (three bytes long)
  1        1     --      --     --     --    jump to location
 65       41     --      --     --     --    jump and wait for
                                             VBLANK

Modes marked with an asterisk (*) have no equivalent in BASIC.
These are the instructions in the display list. You can alter the display
instructions by setting the bits for horizontal or vertical scroll, load
memory scan (tells ANTIC where the next line(s) to be displayed are in
memory and what mode to use for them) and enable a display list
interrupt. These are:

Function                   add
                         decimal   hex   bit
Vertical scroll             16     10    4
Horizontal scroll           32     20    5
Load memory scan            64     40    6
Display list interrupt     128     80    7

The LMS instruction is a three-byte instruction; the second and third
bytes are the LSB and MSB of the address where the line or screen data
is to be displayed. You can add any or all of these modifications to the
text or graphics mode instructions. You can only add the interrupt
modification to blank line or jump instructions. The two bytes that
follow the jump instructions are the LSB and MSB of the address to
which the ANTIC jumps to continue or repeat the list.