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Atari 520ST

520ST · 1985–1989 · desktop

Specifications

Cpu: Motorola 68000, 8 MHz
Ram: max: 1 MB with a socket upgrade; later Mega ST and 1040ST models shipped with more · base: 512 KB
Ports: MIDI IN/OUT/THRU · Cartridge slot · External floppy disk port · DMA port (hard disk) · Serial (RS-232) port · Parallel (Centronics) port · Joystick/mouse ports
Display: Built-in Shifter video: up to 640×400 monochrome or 320×200 in 16 colors from a 512-color palette
Storage: base: Internal 3.5" floppy drive, 360 KB (single-sided) or 720 KB (double-sided) per disk depending on unit · options: External 3.5" floppy drive · Hard disk via the DMA port
Os Support: latest: TOS 1.04 · shipped: TOS 1.0 (with GEM desktop) in ROM
Release Price: $799 (bundled with a monochrome monitor)

Variants

Models

520ST520ST1985 launch, external RF modulator box

520STM520STM1985, added integrated TV modulator

520STFM520STFM1986, integrated 3.5-inch floppy drive and modulator

Upgrade paths

RAM

1 MB via a well-documented socketed chip swap · Requires desoldering or removing socketed 64Kbit DRAMs and fitting 256Kbit chips with jumper changes; a common period upgrade, not solder-free on all boards.

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