Atari family - ATARI 65XEM

Atari announced a second variation of the 65XE, the 65XEM (for XE Music). This version featured a new powerful polyphonic sound chip called AMY with 8 independent sound voices and 64 oscillators. It was able to synthesize voice and any musical instrument sound much better than the Commodore 64 's SID chip. However, the AMY chip never reached production, so the 65XEM never passed the prototype stage either.

Image, description and specification taken with permission by

System unit	Description
Processor	MOS 6502C
Clock speed	1.79 MHz (NTSC) / 1.77 MHz (PAL)
RAM	64 KB
ROM	24 KB (16 KB for OS, 8 KB for Atari BASIC)
O.S. version(s)	XE O.S.
Built-in software	Self-Test, Atari BASIC Revision C
Colors	16 colors with 16 intensity level each
Sound	8 voices, 11 octaves (AMY chip)
Text modes	Five text modes, max: 40 x 24, min: 20 x 12
Graphics modes	16 graphic modes, maximum: 320 x 192 pixels
Co-processor	GTIA (video output, sprites), POKEY (sound, I/O), ANTIC (video, display lists), FREDDY (memory)
I/O ports	Composite video output, Cartridge port (1 Adress space : 16 KB), Expansion port, SIO peripheral port (tape, disk, printer, modem), 2 x joystick connectors
Controller port(s)	2
Parallel Bus Interface	Yes
Power supply	External power supply unit - 1A, 5v cc
Keyboard	Full-stroke keyboard, 57 keys, 5 function keys (Help, Start, Select, Option, Reset)