The Atari Mega ST2
The Atari Mega ST2 seems to have been introduced in 1989. It ran the Atari GEM ( Graphical Environment Manager ), quite similar to the MacOS Finder. it had a cartridge port, two serial RS 232 ports, a joystick and a mouse port and a parallel port. It had a great popularity among musicians because of is MIDI ports.
Manufacturer / model Atari / Mega ST2
Year of introduction / price 1989 / ???
CPU type / speed Motorola 68000 / 8Mhz
Standard RAM size / max 2MB / 8MB
Supported Operating systems TOS 1.00/1.2 and GEM
Integrated media type and size internal 3"1/2 ( 720k ) floppy disk drive
Accessories I have black and white SM124 monitor, Megafile SH204 HD (20MB),

Seikosha printer

Where I got it given by Jussieu University