Previous instruction
NMI sequence
LDA
fdc_data
EOR
#&FF
STA
user,X
INX
BNE
exit
INC addr+2
INC addr+2
NMI sequence
LDA
fdc_data
EOR
#&FF
STA
user,X
INX
BNE
exit
RTI
RTI
NMI sequence
LDA
fdc_data
EOR
#&FF
STA
user,X
INX
BNE
exit
RTI
RTI
NMI sequence
LDA
fdc_data
EOR
#&FF
STA
user,X
INX
BNE
exit
RTI
Previous instruction
NMI sequence
LDA
fdc_data
EOR
#&FF
STA
user,X
INX
BNE
exit
INC addr+2
INC addr+2
NMI sequence
LDA
fdc_data
EOR
#&FF
STA
user,X
INX
BNE
exit
RTI
RTI
NMI sequence
LDA
fdc_data
EOR
#&FF
STA
user,X
INX
BNE
exit
RTI
RTI
NMI sequence
LDA
fdc_data
EOR
#&FF
STA
user,X
INX
BNE
exit
RTI
nmi_rdio
µs
cyc.
5
35
0
10
15
20
25
30
5
0
10
15
NMI
FDC service deadline
NMI