DMA
Time
Slot
Allocation
l
Horizontal
Line
(Cont'd)
Five clocks must occur before the data which was fetched for a
particular position can appear onscreen. For example, if data
fetch start is specified as
38,
it
will not be available for display
until clock number
45.
I
l
-I
l
3
I
320
moae
BIl-Plooe
Our.
81
plane
640
noas
~~t-~~ons
OVA.
by
plans
5-19 some
as
cvcle
4
1
A
hardware data-fetch stop has been installed at count
D8
so as
I
to prevent the bit-plane data-fetch from overrunning the time
allotted for the memory refresh or disk
DMA.
End
Hortz
LIne
FeCch
0
f
ontal
Data
Cvcle
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