Atari 400 Hardware Manual

Character MaE DisElay Modes
I OS
I
IChars.IScan !Color !Data !Color
I Bit
I
I and
IInst.
Colors per
ILinesiClocksiBits !Select !Values Color
I
IBASICIReg.
per
Std.
I per I per I per !Bits Inl in
Reg.
I
Modes HEX Mode Line
IChar.IPixel IPixell
Name
I Data
Select!
I I I I I
I
0 2
1~
40
I
8
I
~
I
1
I I
0
PF2
I
I I I I
1
PF1
I
I I I I
~LUM)
I
I
I
I I
I
3
1~
40
I
10
~
I
1
I
I
0 PF2
I
I I I I
1
PF1
I
I I I I
I
~LUM)
I
I I I I
00
I BAK
I
4
5
40
I
8
1
I
2
!Bit 7
I
01
I PFO
I
I
I
= o
I
10
I
PF1
I
I I
I
11
I
PF2
I
I I I I
I
I
!Bit 7
I
11
I
PF3
I
I
I
= 1
I I
I
I I
I
00
I
BAK
I
5
5
40 16 1
I
2
!Bit 7
I
01
I
PFO
I
I
= o
I
10
I
PFl
I
I I
11
I
PF2
I
I I
I I
Bit 7
I
11
I
PF3
= 1
I I
I
0
I
BAK
1 6 5
20 8 1 1 00
I
1
I
PFO
01
I
1
I
PF1
10
I
1
I
PF2
11
I
1
I
PF3
I
0
I
BAK
2 7
5 20
16 1
1
00
I
1
I
PFO
01
I
1
I
PF1
10
I
1
I
PF2
11
I
1
I
PF3
II.17

Atari 400 Specifications

General

Manufacturer	Atari
Model	400
Type	Home Computer
Release Year	1979
CPU	MOS Technology 6502
CPU Speed	1.79 MHz
ROM	10 KB
Operating System	Atari OS
Keyboard	Membrane keyboard
RAM	8 KB (expandable to 48 KB)
Graphics	ANTIC and GTIA chips
Sound	4 channels
Display	RF output for connection to TV
Storage	Optional cassette tape drive or floppy disk drive
Ports	Cartridge
Display Resolution	320x192 (16 colors)