CPU: Atari SALLY 6502 ("6502C")
1.79 MHz, which drops to 1.19 MHz when the TIA Television Interface Adaptor or RIOT (6532 RAM-I/O-Timer) chips are accessed
Unlike a standard 6502, SALLY can be halted to let other devices control the bus.

RAM: 4 KB (2 6116 2Kx8 RAM ICs)
ROM: built in 4 KB BIOS ROM, 48 KB Cartridge ROM space without bank switching
Graphics: MARIA custom chip
Resolution: 160×240 (160×288 PAL) or 320×240 (320×288 PAL)
Color palette: 256 (16 hues * 16 luma), different graphics modes restricted the number of usable colors and the number of colors per sprite
Direct Memory Access (DMA)
Graphics clock: 7.15 MHz
Line buffer: 200 bytes (double buffering), 160 sprite pixels per scanline, up to 30 sprites per scanline (without background), up to 100 sprites on screen
Sprite/zone sizes: 4 to 160 width, height of 4, 8 or 16 pixels
Colors per sprite: 1 to 12 (1 to 8 visible colors, 1 to 4 transparency bits)
I/O: Joystick and console switch IO handled by 6532 RIOT and TIA
Ports
2 joystick ports
cartridge port
expansion connector
power in
RF output
Sound: TIA as used in the 2600 for video and sound.
In 7800 mode it is only used for sound.

At least two games include a POKEY sound chip for improved audio.
CPU: Atari SALLY 6502 ("6502C")
1.79 MHz, which drops to 1.19 MHz when the TIA Television Interface Adaptor or RIOT (6532 RAM-I/O-Timer) chips are accessed
Unlike a standard 6502, SALLY can be halted to let other devices control the bus.
RAM: 4 KB (2 6116 2Kx8 RAM ICs)
ROM: built in 4 KB BIOS ROM, 48 KB Cartridge ROM space without bank switching
Graphics: MARIA custom chip
Resolution: 160×240 (160×288 PAL) or 320×240 (320×288 PAL)
Color palette: 256 (16 hues * 16 luma), different graphics modes restricted the number of usable colors and the number of colors per sprite
Direct Memory Access (DMA)
Graphics clock: 7.15 MHz
Line buffer: 200 bytes (double buffering), 160 sprite pixels per scanline, up to 30 sprites per scanline (without background), up to 100 sprites on screen
Sprite/zone sizes: 4 to 160 width, height of 4, 8 or 16 pixels
Colors per sprite: 1 to 12 (1 to 8 visible colors, 1 to 4 transparency bits)
I/O: Joystick and console switch IO handled by 6532 RIOT and TIA
Ports
2 joystick ports
cartridge port
expansion connector
power in
RF output
Sound: TIA as used in the 2600 for video and sound. In 7800 mode it is only used for sound.
At least two games include a POKEY sound chip for improved audio.
Atari 7800