Atari ST series Technical Reference Manual page 398

Table K-2. Auto-Vector Interrupts
Vector
Number Address
28 $070
$074
29
30 $078
31
$07C
Table K-3. TRAP Instruction Vectors
Vector
Number Address
32 $080
33 $084
34 $088
35-44 $08C-$0B0
$0B4
45
$0B8
46
47 $0BC
$0C0-$0FC
48-63
Table K-4. User Interrupt Vectors (MFP 68901)
Vector
Number Address
64
$ 1 0 0
65 $104
$108
6 6
67 $10C
$ 1 1 0
6 8
69 $114
70 $118
71 $11C
72
$ 1 2 0
$124
73
74 $128
75 $12C
76 $130
77 $134
78 $138
79 $13C
Processor State Save Area
Exception vectors 2, 3, 4, 6, 7, and 8 all point to a handler that saves infor­
mation about the processor state, and displays a number of mushroom
390
APPENDIX K
Level 4 Interrupt: Vertical blanking sync
(Vblank)
Level 5 Interrupt
Level 6 Interrupt: MK68901 MFP chip interrupts
Level 7 Interrupt: Nonmaskable interrupt
TRAP #0 (unused by system)
TRAP #1 (GEMDOS calls)
TRAP #2 (used by GEMDOS)
TRAPs #3-12 (unused by system)
TRAP #13 (BIOS calls)
TRAP #14 (XBIOS calls)
TRAP #15 (unused by system)
Reserved by Motorola
Parallel Port (int 0)
RS-232 Carrier Detect (int 1)
RS-232 Clear to Send (int 2)
Graphics blit done (int 3)
RS-232 baud rate generator (Timer D)
200 Hz system clock (Timer C)
Keyboard/MIDI (6850 processor) (int 4)
Polled Floppy Disk Controller/Hard Disk
Controller (int 5)
Horizontal Blank counter (Timer B)
RS-232 transmit error interrupt
RS-232 transmit buffer empty interrupt
RS-232 receive error interrupt
RS-232 receive buffer full interrupt
User/application (Timer A)
RS-232 ring indicator (int 6)
Polled monochrome monitor detect (int 7)
Vector
Vector
Vector