Table of Contents
Advertisement
,....
l\)
0':>
o
0':>
I
c.o
o
o
,....
o
n
M-
.
,....
c.o
0':>
c.o
Initialize
DMA
Initialize
Disc
Memory
{
CW1
CW2
CW3
CW4
LDA
OTA
CLC
LDA
OTA
STC
LDA
OTA
LDA
OTA
STC
STC
OCT
OCT
DEC
OCT
Table 3. A Sample Program (1260QA)
CWl
Output control word (CW1) specifying
that
a CLCis automat-
7
ically issued
by
DMA after the last word has been transferred
(bit 13 ::;:
til ")
and the I/O address of the disc memory (bits 0-5
::;: 1,(
8 ),
. .
.
3
Output control word (CW2) specifying an input operation (bit 15
CW2
=
"I") and the starting memory address
(bits
0 ... 14 ::;: 1,6,6,6,6;:.).
3
3
Output control word (CW3) specifying the 2 's complement of the
CW3
number of words to be transferred (4096).
3
CW4
Output to the control channel of the. disc memory the control
lIB
word (CW4) specifying a read (bit 15 ::;: ".o") from track ltie
(bits 8-14=Y11i1e) beginning with sector 25 e (bits 0-6
=
25
8 ).
7, C
Acti vate DMA channel 2.
to
Initiate disc data transfer.
2.0,01.0
11.0.0,0,0
-4,096
4,025
Advertisement
Table of Contents
