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8272
TIMING
WAVEFORMS
PROCESSOR
READ
OPERATION
Ao,
Cs,
DACK
~
________
~Xl...
___ _
-I
IA.
I-I..
I
IRA
1-
Ro
\ ,r-----
~"
----~=::{
-I'"
~----
I
I~'RI-I
INT
---------------.L
PROCESSOR
WRITE
OPERATION
AO,
iSS,
DACK
~
t
-I
lAW
I-'WW-I
IWA
1-'-----
\ 1
I-tow-
iWDI-
DATA
---""'X
I
~,..----
I-'WI-I
L
INT
ClK
DMA
OPERATION
'"'
~'--_---;"~'---V
_}--
-t
AM
- /
WA
DR
Rii
1_.
_IRQ~'---W-
--
----'I,
_ \\-_----11--
-IRQWIWRI-I
--IFlQA(RO)--
FDD
READ
OPERATION
WRITE
CI~CC~
I'--
__
-Jf\
!\1...
_____
1l--
~
-lweH
-=1
:-
IWE
I-,wev-I
-II-IWE
WRITE ENABLE L
lWEI I I
PRESHIFT 0
OR
1
IPSo,1i
WRITE
DATA
IWDAI
r------~
I-Ie.
PRESHIFT 0 PRESHIFT 1
NORMAL
0 0
lATE
0 1
EARLY 1
0
INVALID
1 1
9-65