> What kind of SIMMS does it use?
Parity 70 ns  72 pin. Six sockets for industry standard SIMM parity memory up to 192 MB 20 MB/second Micro Channel bus

SCSI Termpacks are Dale 8 pin SIPPs, 221-331G (dtd '93)
DRAMs are (x8) Siemens HYB514256BJ-70

Processor Card GAL-LITE CPU W/Cache Adapter, FCC C6P3350-66

CPU Settings on SW1

   NOTE: Processor card will not operate if more than one processor type is selected.
 

Two 50 to 19,200 baud serial ports
        One 8-bit parallel bi-directional port

> How many bays does the case have? What are their configurations?  Are they internal? external?

   The 3350 has 4 drive bays.  Two are external (the top external bay can hold a 5 1/4" device like a CDROM drive).  The other bays are for 3 1/2" devices only.  In order to get the fourth bay (the "upper" "rear" bay, two sheet metal extenders are installed above bay three (bay three is the "lower" "rear" bay).  If bay four is used, you cannot use the upper front bay for a 5 1/4" device (there is not enough room).

There is also a SCSI connector on the back of the system for external
SCSI devices.
 

   There is a socket on the non-SX version of the processor board for a
128K cache (optional).

The SX board has the SX chip surface mounted and no
switchs. The DX2 board has the CPU in a ZIF socket with a switch
block next to it

        Cache Memory Socket which supports 64 KB or 128 KB cache 
module You need the latest BIOS from the BBS: 1.09.00 or later. 83mhz upgrade really does improve things...
   4 MCA slots.  One is an MCA video slot, and has the extra connector for
the Clarity 1 card. 

> What kind Video subsystem does it have? What is the chipset?
NCR 77C22E.  Capable of 1024X768  256 colors.

   There was an optional video board built specifically for the 3350
called the "Clarity 1".  It plugged into a proprietary slot, and was
capable of up to 1280x1024.

> How much Video ram does it have?
   The 77C22E has 1 MB of video RAM.  The Clarity 1 has 2 MB. The feature/kit number for the clarity 1 is 3350-F/K256.

 http://www3.ncr.com/support/pc/pcdesc/library/3350_55.shtml
> How can i do for install easely install one of the two ?  --- No CD driver on this machine :-(( , because MCA bus ---

You need DOS CDROM drivers to install Win 95 or NT.  Take a look at
     http://www3.ncr.com/support/pc/pcdesc/library/3350_55.shtml.
You have a 53c94 SCSI host adapter on the motherboard.  You will need two drivers - the CAM driver and the CDROM driver.  Your config.sys should look something like this:

     DEVICE=a:cam_c9x.SYS /D
     DEVICE=a:cdscsi-2.sys /D:ASPICD0

Some of the older 1x CDROM drives (like the Sony or the Toshiba) needed a specific driver (in place of cd-scsi-2.sys).