Atari 400 Hardware Manual

HSCROL I lXXI lXXI lXXI lXXI lXXI lXXI lXXI lXXI Horizontal Scrolling
VSCROL I I IXXIXXI I IXXIXXI I IXXIXXI I IXXIXXI Vertical Scrolling
LD MEM SCAN I I I I IXXIXXIXXIXXI I I I IXXIXXIXXIXXI Load memory scan (3 byte)
INST INTERRUPT I I I I I I I I IXX!XX!XX!XX!XXIXXIXXIXXI Display instruction interrupt
I I I I I I I I I
BLK 1 00 I I lBO
" 2 10 I I 190
" 3-7 I I I
" B 70 I I IFO
JMP 01 I I B1
J VB 41 I I c 1
CHR (40,2,B) 02 12122 32 42152 62 72 B2 92IA2IB2 C2 D2IE2IF2
" (40,2,10) 03 13123 33 43153 63 73 B3 93IA3IB3 C3 D3IE3IF3
" (40,4,B) 04 14124 34 44154 64 74 B4 94IA4IB4 C4 D4IE4IF4
" (40,4,16) OS 15125 35 45155 65 75 BS 9SIASIBS cs DSIESIFS
" (20,5,B) 06 16126 36 46156 66 76 B6 96IA6IB6 C6 D6IE6IF6
" (20,5,16) 07 17127 37 47157 67177 B7 97IA7IB7 C7 D7IE7IF7
MAP (40,4,B) OB 1BI2B 3B 4BISB 6BI7B BB 9BIABIBB CB DBIEBIFB
" (B0,2,4) 09 19129 39 49159 69179 B9 99IA9IB9 C9 D9IE9IF9
" (B0,4,4) OA 1AI2AI3A 4AISA 6AI-VA BA 9AIAAIBA CA DAIEAIFA
"
(160,2,2) OB 1BI2BI3B 4BISB 6BI7B BB 9BIABIBB CB DBIEBIFB
" (160,2,1) oc 1CI2CI3C 4CISC 6CI7C BC 9CIACIBC cc DCIECIFC
It (160,4,2) OD 1DI2DI3D 4DISD 6DI7D BD 9DIADIBD CD DDIEDIFD
It (160,4,1) OE 1EI2EI3E 4EI5E 6EI7E BE 9EIAEIBE CE DEIEEIFE
It (320,2,1) OFI1FI2FI3F 4FI5F 6FI7F BF 9FIAFIBF CF DFIEFIFFI
I I I
I I _._I __
I
I
Number of TV lines per cell
Number of Colors (Background + Playfield types)
Number of Horizontal cells (standard width screen)
Figure II.3
DISPLAY INSTRUCTION OPCODES
II.9
Blank 1 line
Blank 2 lines
Blank 3 thru 7 lines
Blank B lines
Jump (3 byte instruction)
Jump & wait for Vert. Blank
(also 3 byte)
Character Mode
Instructions
Memory Map Mode
Instructions

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)