
AT & T, INC.

AT & T, INC. GLOBALYST 550

AT & T, INC. GLOBALYST 575

Processor       SL80486SX/SL80486SX2/SL80486DX2/SL80486DX4/P24C/
                486Overdrive
Processor Speed 33/50(internal)/66(internal)100(internal)MHz
Chip Set        Unidentified
Video Chip Set  S3
Maximum Onboard 128MB
Memory
Maximum Video   2MB
Memory
Cache           256KB
BIOS            IBM
Dimensions      330mm x 218mm
I/O Options     Floppy drive interface, IDE interfaces (2), parallel port,
                PS/2 mouse port, serial ports (2), VGA port, riser slot,
                cache slot
NPU Options     None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  PS/2 mouse port            CN2       IDE interface 1            CN9

  Serial port                CN3       Front panel security       JSEC
                                       switch

  Serial port                CN4       Speaker                    JSPR

  Parallel port              CN5       Front panel LEDs           LED

  VGA port                   CN6       Riser slot                 SL1

  Floppy drive               CN7       Cache slot                 SL2
  interface

  IDE interface 2            CN8

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

      Jumper information unavailable        CN1          Unidentified

      Monitor type select color            SW1/2              Off

      Monitor type select monochrome       SW1/2              On

  Note: If a VGA processor is enabled, SW1/2 has no function. If the VGA
  controller is disabled, and a CGA or MDA controller is installed, set
  the switch to the above setting.

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1        Bank 2          Bank 3

      4MB       (1) 1M x 36        None          None            None

      8MB       (1) 1M x 36    (1) 1M x 36       None            None

      8MB       (1) 2M x 36        None          None            None

     12MB       (1) 1M x 36    (1) 1M x 36    (1) 1M x 36        None

     12MB       (1) 1M x 36    (1) 2M x 36       None            None

     16MB       (1) 1M x 36    (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

     16MB       (1) 1M x 36    (1) 1M x 36    (1) 2M x 36        None

     16MB       (1) 2M x 36    (1) 2M x 36       None            None

     16MB       (1) 4M x 36        None          None            None

     20MB       (1) 1M x 36    (1) 4M x 36       None            None

     20MB       (1) 1M x 36    (1) 2M x 36    (1) 2M x 36        None

     24MB       (1) 1M x 36    (1) 1M x 36    (1) 2M x 36    (1) 2M x 36

     24MB       (1) 2M x 36    (1) 2M x 36    (1) 2M x 36        None

     24MB       (1) 1M x 36    (1) 1M x 36    (1) 4M x 36        None

     28MB       (1) 1M x 36    (1) 1M x 36    (1) 4M x 36    (1) 1M x 36

     28MB       (1) 1M x 36    (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

     32MB       (1) 2M x 36    (1) 2M x 36    (1) 4M x 36        None

     32MB       (1) 2M x 36    (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

  Note: The location of banks 0, 1, 2, & 3 are unidentified. This table
  is for the Globalyst 550 system and early revisions of Globalyst 575
  systems.

                        DRAM CONFIGURATION (CON'T)

     Size          Bank 0         Bank 1        Bank 2          Bank 3

     32MB       (1) 4M x 36    (1) 4M x 36       None            None

     36MB       (1) 1M x 36    (1) 4M x 36    (1) 4M x 36        None

     40MB       (1) 1M x 36    (1) 1M x 36    (1) 4M x 36    (1) 4M x 36

     48MB       (1) 4M x 36    (1) 4M x 36    (1) 4M x 36        None

     52MB       (1) 1M x 36    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

     64MB       (1) 4M x 36    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

  Note: The location of banks 0, 1, 2, & 3 are unidentified. This table
  is for the Globalyst 550 system and early revisions of Globalyst 575
  systems.

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1        Bank 2          Bank 3

      4MB       (1) 1M x 36        None          None            None

      8MB       (1) 1M x 36    (1) 1M x 36       None            None

      8MB       (1) 2M x 36        None          None            None

     12MB       (1) 1M x 36    (1) 1M x 36    (1) 1M x 36        None

     12MB       (1) 1M x 36    (1) 2M x 36       None            None

     16MB       (1) 1M x 36    (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

     16MB       (1) 1M x 36    (1) 1M x 36    (1) 2M x 36        None

     16MB       (1) 2M x 36    (1) 2M x 36       None            None

     16MB       (1) 4M x 36        None          None            None

     20MB       (1) 1M x 36    (1) 4M x 36       None            None

     20MB       (1) 1M x 36    (1) 2M x 36    (1) 2M x 36        None

     24MB       (1) 1M x 36    (1) 1M x 36    (1) 2M x 36    (1) 2M x 36

     24MB       (1) 2M x 36    (1) 2M x 36    (1) 2M x 36        None

     24MB       (1) 1M x 36    (1) 1M x 36    (1) 4M x 36        None

     28MB       (1) 1M x 36    (1) 1M x 36    (1) 4M x 36    (1) 1M x 36

     28MB       (1) 1M x 36    (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

     32MB       (1) 2M x 36    (1) 2M x 36    (1) 4M x 36        None

     32MB       (1) 2M x 36    (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

     32MB       (1) 4M x 36    (1) 4M x 36       None            None

     32MB       (1) 8M x 36        None          None            None

     36MB       (1) 1M x 36    (1) 4M x 36    (1) 4M x 36        None

     36MB       (1) 1M x 36    (1) 8M x 36       None            None

     40MB       (1) 1M x 36    (1) 1M x 36    (1) 4M x 36    (1) 4M x 36

     48MB       (1) 4M x 36    (1) 4M x 36    (1) 4M x 36        None

     48MB       (1) 4M x 36    (1) 8M x 36       None            None

     52MB       (1) 1M x 36    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

     64MB       (1) 4M x 36    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

     64MB       (1) 8M x 36    (1) 8M x 36       None            None

     68MB       (1) 1M x 36    (1) 8M x 36    (1) 8M x 36        None

  Note: The location of banks 0, 1, 2, & 3 are unidentified. This table
  is for the Globalyst 575 system revisions released after the end of
  1994..

                        DRAM CONFIGURATION (CON'T)

      Size          Bank 0        Bank 1         Bank 2         Bank 3

      80MB        (1) 4M x 36   (1) 8M x 36    (1) 8M x 36       None

      96MB        (1) 8M x 36   (1) 8M x 36    (1) 8M x 36       None

     100MB        (1) 1M x 36   (1) 8M x 36    (1) 8M x 36   (1) 8M x 36

     112MB        (1) 4M x 36   (1) 8M x 36    (1) 8M x 36   (1) 8M x 36

     128MB        (1) 8M x 36   (1) 8M x 36    (1) 8M x 36   (1) 8M x 36

  Note: The location of banks 0, 1, 2, & 3 are unidentified. This table
  is for the Globalyst 575 system revisions released after the end of
  1994..

                CACHE CONFIGURATION

           Size                      SL2

           None                 Not installed

          256KB            256KB module installed

                        VIDEO MEMORY CONFIGURATION

          Size                    Bank 0                   Bank 1

           1MB                     1MB                      None

           2MB                     1MB                      1MB

  Note: Bank 0 is factory installed and is not configurable. The size of
  the upgrade ships are unidentified.

  CPU SPEED SELECTION

   Speed       SW1/1

   33MHz        Off

   50iMHz        On

   66iMHz       Off

  100iMHz       Off

                            CPU TYPE SELECTION

               Type                                  J53V

                 1                            Pins 1 & 2 closed

                 2                            Pins 5 & 6 closed

  Note: This jumper set the 3.3v for the P24C CPU. Type 1 & 2 are
  unidentified.

