Excerpt from the original announcement letter; 
	   
The new Premier PS/2(R) 76, 77 and Ultimedia(TM) M77 are full 32 bit 486
Micro Channel(R) systems designed to enhance the PS/2 product line at very
attractive prices. 
...These systems are offered in two mechanical packages, the PS/2 76 provides
3 slots (2 slots available for expansion) and 3 bays (1 available for
expansion) and the PS/2 77 and M77 provide 5 slots (of which 4 slots on
the 77 and 3 slots on M77 are available for expansion) and 4 bays
(of which 2 bays on the 77 and 1 on the M77 are available for expansion).
...Standard features on these new systems include a SCSI Controller with
larger and faster hard disk drives, video is provided via the XGA-2(TM)
Display Adapter/A designed to meet the International Standard Organization
(ISO) requirements, support for up to 32MB of 70 ns memory on the planar,
two 9-pin serial ports, A high speed DMA parallel port and OS/2 2.00.1
installed on the hard disk drive and ready for use in a standard
configuration.
The enhanced IBM mouse is a standard feature in all the systems.
In addition, M77 Ultimedia Models come with a CD-ROM, built-in audio
functions and a variety of Ultimedia sampler applications.
The systems support up to 32 MB of 70-ns memory on the planar in four
SIMM sockets.
All systems ship with one 8MB single in-line memory module (SIMM) located
in SIMM socket 1 leaving three SIMM socket available for memory expansion.

www.can.ibm.com/helpware/9577.html