- Released: June 1985
- Type: Personal computer
- Introductory price: US$799.99 (monochrome monitor), US$999.99 (color monitor)
- Manufacturer: Atari
- CPU: Motorola 68000 @ 8 MHz
- Memory: 512 KB
- OS: Atari TOS/GEM (Digital Research)
- ROM: 192 KB
- Built in media: 3.5″ 360 KB floppy drive (external)
- Predecessor: Atari 8-bit family
- Successor: 1040ST
- Graphic: 320 x 200 / 640 x 200 / 640 x 400
- Colors: 16 of 512 (320 x 200) / 4 of 512 (640 x 200) / monochrome (640 x 400 – special monitor)
- Sound: 3 voices, 8 octaves
- I/O ports: RGB, Cardridge, MIDI, Centronics, RS232c, Hard Disk, Floppy drive, Joystick, Mouse
Released 1985: The Atari ST is a line of home computers from Atari Corporation and the successor to the Atari 8-bit family. The initial ST model, the 520ST, saw limited release in April-June 1985 and was widely available in July. The Atari ST is the first personal computer to come with a bitmapped color GUI, using a version of Digital Research’s GEM released in February 1985.
The Atari ST is part of a mid-1980s generation of home computers that have 16 or 32-bit processors, 256 KB or more of RAM, and mouse-controlled graphical user interfaces. It includes the Macintosh, Commodore Amiga, Apple IIGS, and, in certain markets, the Acorn Archimedes. “ST” officially stands for “Sixteen/Thirty-two”, which refers to the Motorola 68000’s 16-bit external bus and 32-bit internals.
My Atari ST520: I got it together with a lot of Commodore 64’s, it was complete with mouse, external floppy drive and a power supply. However, it was really dirty and didn’t worked when power on. I took the ST apart, including all the key caps and gave them a good clean. Inside, it had a 3rd part memory expansion that was “piggy back” type and some clamps for currents. It all had loosened. Once I fitted it correctly, the computer worked.
Repair floppy drive
Next, the floppy drive was just spinning and refused to load any floppies. Once opened, I spotted the drive belt had melted/snapped. I found a rubber band as an replacement to temporary test if that was it. I succeeded loading the game “OutRun”. I then found a proper belt replacement on Internet.