The Macintosh Plus was the first real improvement on the Macintosh 128 (The Macintosh 512 was only a Mac 128 with 512 KB RAM).
It had a lot of new features: the extended ROM held the new version of Mac OS, enhanced graphics libraries, drivers for hard-disk and external floppy-disk units, a SCSI bus, AppleTalk networking and the new file manager: HFS (Hierarchical File System).
The new floppy-disk unit could use double-sided 800 KB disks (only one-sided 400 KB for the 128). It had an enhanced keyboard with a numeric keypad and last, but not least, it had a SCSI 1 (1.5 MB/s) interface.
This computer would be succeeded in 1988 by the new Macintosh series: the Macintosh SE and the Macintosh II. However, it stayed in Apple's product line longer than any other Macintosh machine, almost five years, and was on sale until 1990.
NAME
MACINTOSH Plus
MANUFACTURER
Apple
TYPE
Home Computer
ORIGIN
U.S.A.
YEAR
January 1986
END OF PRODUCTION
October 1990
BUILT IN LANGUAGE
None
KEYBOARD
Full-stroke 78 keys with numeric keypad
CPU
Motorola MC 68000
SPEED
7.8336 MHz
RAM
1 MB (up to 4 MB) IBM RAM SIMM's as well as any other 1MB SIMM could be added
ROM
128 KB
GRAPHIC MODES
512 x 342 dots
COLORS
Monochrome
SOUND
Tone Generator & Digital-Analog converter (22KHz sampling rate)
SIZE / WEIGHT
34.5(H) x 24.5 (W) x 27.5 (D) cm / 7.48 kg
I/O PORTS
RS 232/422 x 2 for printer and modem, SCSI, external F.D. unit, ext. loudspeaker