Atari 520STe, STfm

I have two 520STe and two 520STfm main units, Atari Hard Drive sh204,
two Atari SM124 Monitor, Color Monitor, many Mice and many Joysticks.

type computer
country USA
year 1987 (stfm) / 1989 (ste)
os TOS 1.20-1.62 (rom), GEM-desktop
cpu  Motorola mc 86000
speed 8 MHz
ram 512 KB
rom 192 KB
disk 3.5″ 720kb
graphic 320×200 (16)
colors 512 (stfm) / 4096 (ste)
sound Yamaha YM2149, 3 channel, 8-bit mono i/o
ports cartridge, joystics, mouse, rs323, centronigs, midi (in,out), floppy disk, ACSI,
ST mono/ST color, RF

---

The Atari 520STe — The Enhanced Entry-Level ST

The Atari 520STe was the lower-memory variant of the enhanced STe range, offering the same hardware improvements as the 1040STe — enhanced sound, blitter chip, hardware scrolling, and 4096-colour palette — in a configuration with 512 KB of RAM rather than 1 MB. Released in 1989 alongside the 1040STe, it provided an entry point into the enhanced ST hardware at a lower price, though the 512 KB memory limitation meant it struggled with the more demanding software of the era.

The STe Enhancements

Like all STe models, the 520STe added DMA stereo sound channels capable of 8-bit playback at up to 50 kHz — a significant improvement over the original ST’s three-voice YM2149 sound chip. The Blitter chip handled fast block memory transfers for smooth scrolling and sprite movement, addressing one of the ST’s most significant gaming weaknesses compared to the Amiga. These hardware additions made the STe family notably more capable for games and multimedia, though the compatibility issues with existing ST software remained a persistent problem.

The STfm Variant

The ”fm” designation in Atari ST model names indicated the presence of an integrated RF modulator, allowing the computer to connect directly to a standard television set rather than requiring a dedicated monitor. This made the STfm variants more affordable for home users who already owned a suitable television, broadening the ST’s appeal beyond the dedicated computer enthusiast market.