Atari 800XL

Co"uTi,*nd Frame
{rrom Co^r^pu\ef)
Cnrntnanid FrflTiie
1)
Data
Srod
2)
Oata
Rnrcivc
3) Irnmf^jflic
(N'o DaTa-CorrrrTiAnrl
Only,
t,^., ^TH*tl;s)
Acknowlf-dgr
Trarnc (Frarn Prr
ip^rral)
Opiiona! Data Frame (To Or From
Compulf^r)
CoFDpI^lc
Frame
(From
Ppriphrral)
Figure
1-9 iJiou'S
pin
assignments lor
the
SIO
i cnr-e^tor.
to J2
IL
13
1 -
Clock Injxrt
S- Motor Cor^trol
2.
Clock Output
9.
Proceed
3-
Data Input
10.
*5/Refldy
ft- Ground
I I, Audio Tnput
5-
Data
Output
12.
Not Connected
6. Ground
13, [nterrupt
?,
Command
Figure 1-9, SIC
Cwmrctor
Pin A^^i^nme-nts
KEYBOARD I
NTERFACE
The keyboard has
55
alphanumeric
key^ (iT>r.!ijding
^[»f-ciai ch^r^rter^ rind rontrois),
a
spacebar, which interface thru
U2* and U25
Keyboard Sense/Scan Decoders, four
(unction keys, and
a
RESET key-
800XL
Compurer
1-12
Field
Servire ManitaJ