Atari 800XL Service Manual

Alphanumeric Television Inte
rface
Controlter fANTirt
The
ANTIC
Display
Processor
is
a
custom
display
microprocessor
with
an
instruction
set
customized
for
graphics
generation.
It
also
has
the
ability
to
control
the
ADDRESS
&
DATA
bus
and
RAM
Refresh.
Ground
VSS
Alphanumeric
Data
MT
Alphanumeric
Data
ANl
Light
Pen
IF
Alphanumeric
Data
MT
System
Reset
FPU
Interrupt
Output
NM1
Refresh
FFF
HALT
TOUT
Address
Bus
A3
Address
Bus
A2
Address
Bus
A1
Address
Bus
AO
Read/Write
R/TT
Ready
Output
RDY
Address
Bus
A10
Address
Bus
A12
Address
Bus
A13
Address
Bus
A14
Address
Bus
A15
D4
Data
Bus
D5
Data
Bus
D6
Data
Bus
D7
Data
Bus
RST
Reset
F0O
Fast
Phase
0
Clock
00 Phase
0
Clock
D3
Data
Bus
D2
Data
Bus
D1
Data
Bus
DO
Data
Bus
02
Phase
2
Clock
A4
Address
Bus
A5
Address
Bus
A6
Address
Bus
A7
Address
Bus
A8
Address
Bus
A9
Address
Bus
All
Address
Bus
VCC
+5V
Power
ANTIC

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