Hier jetzt mal der aktuelle Code.

Code:
$regfile = "m88def.dat"
$prog &HFF , &HE2 , &HDF , &HF9                   ' generated. Take care that the chip supports all fuse bytes.
$hwstack = 128
$framesize = 128
$swstack = 128

Config Lcdpin = Pin , Db4 = Portc.3 , Db5 = Portc.2 , Db6 = Portd.0 , _
       Db7 = Portd.1 , E = Portb.4 , Rs = Portb.5
Config Lcd = 16 * 2
Cursor Off

Config Timer1 = Timer , Prescale = 64

Config Int0 = Falling
Config Int1 = Falling

On Int0 Ges                                       'Geschwindigkeit
On Int1 Dre                                       'Drehzahl
On Timer1 Timer_irq

Enable Int0
Enable Int1
Enable Timer1

Config Sda = Portc.4
Config Scl = Portc.5
Config Portd.2 = Input
Config Portd.3 = Input
Config Portd.0 = Output

Pind.2 = 1
Pind.3 = 1

Dim G_pre As Long
Dim G_set As Word
Dim G_calc As Single
Dim G_out As Integer

Dim D_pre As Long
Dim D_set As Word
Dim D_out As Integer

Do
      Upperline : Lcd " " ; D_out ; "  " ; G_calc ; "                   "
      Lowerline : Lcd " " ; Timer1 ; "                   "
      Waitms 1000
Loop

Ges:
    G_calc = G_set - G_pre
    G_pre = G_set
    G_set = Timer1
Return

Dre:
    D_out = D_set - D_pre
    D_pre = D_set
    D_set = Timer1
Return

Timer_irq:
   D_pre = D_pre - 65535
   G_pre = G_pre - 65535
Return


End
Was mach ich falsch, dass er die Trigger INT0/1 gegen Masse nicht erkennt und die Differenz zwischen den 'pre" und 'set' nicht ausgibt?