Atari ST series Technical Reference Manual page 332

blank interrupt handler, which draws the mouse pointer, to
determine where and whether to redraw the mouse pointer
during the next vertical blank.
- 342 to - 341
Vertical position at which the mouse pointer is to be drawn.
-3 4 0
Mouse pointer draw flag. If nonzero, the mouse pointer will
be redrawn during the vertical blanking interval.
-3 3 9
Mouse interrupt processing flag. A zero means mouse inter­
rupt processing is disabled, while a nonzero value means it
is enabled.
- 338 to - 335
This area is reserved for internal use.
- 334 to - 331
The first word contains the horizontal position of the saved
text cursor, while the second word contains its vertical posi­
tion.
- 330 to - 329
The height (in vertical lines) of the form saved in SAVE__
AREA. This value, along with SAVE__ADDR, SAVE—STAT,
and SAVE__AREA, are used by the system to save the por­
tion of the screen covered by the mouse pointer.
-3 2 8 to -3 2 5
The address of the first word of screen data saved in SAVE—
AREA.
324
APPENDIX H
UR__Y
CUR__FLAG
MOU SE__FLAG
RESERVED
V__SAV__XY
SAVE__LEN
SAVE__ADDR
( - $156 to - $155)
(-$154)
(-$153)
( - $152 to - $14F)
( - $14E to - $14B)
( - $14A to - $149)
(-$ 1 4 8 to -$145)