Atari 800XL Field Service Manual

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

Atari 800XL Specifications

General

Manufacturer	Atari
Type	Home computer
Release year	1983
CPU	MOS Technology 6502C
RAM	64 KB
ROM	24 KB
Operating System	Atari OS
CPU Speed	1.79 MHz (NTSC) / 1.77 MHz (PAL)
Graphics	ANTIC and GTIA chips
Display resolution	160×192 to 320×192 pixels
Sound	POKEY chip
Storage	Cassette tape, floppy disk
Ports	Serial, parallel, monitor, joystick ports