Technical Specifications
- CPU: Atari SALLY 6502 ("6502C")
- Speed: 1.79 MHz, drops to 1.19 MHz when the TIA Television Interface Adaptor or RIOT (6532 RAM-I/O-Timer) chips are accessed
- (note: Unlike a standard 6502, SALLY can be halted to allow other devices to control the bus)
- RAM: 4 KB (2 6116 2Kx8 RAM ICs)
- ROM: built in 4 KB BIOS ROM, 48 KB Cartridge ROM space without bankswitching
- Graphics: MARIA custom graphics controller
- 160×240 (160×288 PAL) resolution or 320×240/288 resolution
- 25 color palette out of 256 colors (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: 7.16 MHz
- I/O: Joystick and console switch IO handled byte 6532 RIOT and TIA
- Ports: 2 joystick ports, 1 cartridge port, 1 expansion connector, power in, RF output
- Sound: TIA video and sound chip, same as the 2600. Only the sound is used in 7800 games. Both video and sound are used in 2600 games.
- Optional POKEY sound chip on cartridge for improved sounds.
Read more about this topic: Atari 7800
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