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# AT & T, INC.
AT & T, INC. GLOBALYST 550
AT & T, INC. GLOBALYST 575
Processor SL80486SX/SL80486SX2/SL80486DX2/SL80486DX4/P24C/
486Overdrive
Processor 33/50(internal)/66(internal)100(internal)MHz
Speed
Chip Set Unidentified
Video Chip S3
Set
Maximum 128MB
Onboard
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
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+--------------------+----------|
| PS/2 mouse port | CN2 | IDE interface 1 | CN9 |
|-----------------+----------+--------------------+----------|
| Serial port | CN3 | Front panel | JSEC |
| | | security 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 | CN1 | Unidentified |
| | unavailable | | |
|-----+-----------------------------+--------+---------------|
| | Monitor type select color | SW1/2 | Off |
|-----+-----------------------------+--------+---------------|
| | Monitor type select | SW1/2 | On |
| | monochrome | | |
|------------------------------------------------------------|
| 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 | None | None | None |
| | 36 | | | |
|--------+------------+------------+------------+------------|
| 8MB | (1) 1M x | (1) 1M x | None | None |
| | 36 | 36 | | |
|--------+------------+------------+------------+------------|
| 8MB | (1) 2M x | None | None | None |
| | 36 | | | |
|--------+------------+------------+------------+------------|
| 12MB | (1) 1M x | (1) 1M x | (1) 1M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 12MB | (1) 1M x | (1) 2M x | None | None |
| | 36 | 36 | | |
|--------+------------+------------+------------+------------|
| 16MB | (1) 1M x | (1) 1M x | (1) 1M x | (1) 1M x |
| | 36 | 36 | 36 | 36 |
|--------+------------+------------+------------+------------|
| 16MB | (1) 1M x | (1) 1M x | (1) 2M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 16MB | (1) 2M x | (1) 2M x | None | None |
| | 36 | 36 | | |
|--------+------------+------------+------------+------------|
| 16MB | (1) 4M x | None | None | None |
| | 36 | | | |
|--------+------------+------------+------------+------------|
| 20MB | (1) 1M x | (1) 4M x | None | None |
| | 36 | 36 | | |
|--------+------------+------------+------------+------------|
| 20MB | (1) 1M x | (1) 2M x | (1) 2M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 24MB | (1) 1M x | (1) 1M x | (1) 2M x | (1) 2M x |
| | 36 | 36 | 36 | 36 |
|--------+------------+------------+------------+------------|
| 24MB | (1) 2M x | (1) 2M x | (1) 2M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 24MB | (1) 1M x | (1) 1M x | (1) 4M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 28MB | (1) 1M x | (1) 1M x | (1) 4M x | (1) 1M x |
| | 36 | 36 | 36 | 36 |
|--------+------------+------------+------------+------------|
| 28MB | (1) 1M x | (1) 2M x | (1) 2M x | (1) 2M x |
| | 36 | 36 | 36 | 36 |
|--------+------------+------------+------------+------------|
| 32MB | (1) 2M x | (1) 2M x | (1) 4M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 32MB | (1) 2M x | (1) 2M x | (1) 2M x | (1) 2M x |
| | 36 | 36 | 36 | 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 | (1) 4M x | None | None |
| | 36 | 36 | | |
|--------+------------+------------+------------+------------|
| 36MB | (1) 1M x | (1) 4M x | (1) 4M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 40MB | (1) 1M x | (1) 1M x | (1) 4M x | (1) 4M x |
| | 36 | 36 | 36 | 36 |
|--------+------------+------------+------------+------------|
| 48MB | (1) 4M x | (1) 4M x | (1) 4M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 52MB | (1) 1M x | (1) 4M x | (1) 4M x | (1) 4M x |
| | 36 | 36 | 36 | 36 |
|--------+------------+------------+------------+------------|
| 64MB | (1) 4M x | (1) 4M x | (1) 4M x | (1) 4M x |
| | 36 | 36 | 36 | 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 | None | None | None |
| | 36 | | | |
|--------+------------+------------+------------+------------|
| 8MB | (1) 1M x | (1) 1M x | None | None |
| | 36 | 36 | | |
|--------+------------+------------+------------+------------|
| 8MB | (1) 2M x | None | None | None |
| | 36 | | | |
|--------+------------+------------+------------+------------|
| 12MB | (1) 1M x | (1) 1M x | (1) 1M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 12MB | (1) 1M x | (1) 2M x | None | None |
| | 36 | 36 | | |
|--------+------------+------------+------------+------------|
| 16MB | (1) 1M x | (1) 1M x | (1) 1M x | (1) 1M x |
| | 36 | 36 | 36 | 36 |
|--------+------------+------------+------------+------------|
| 16MB | (1) 1M x | (1) 1M x | (1) 2M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 16MB | (1) 2M x | (1) 2M x | None | None |
| | 36 | 36 | | |
|--------+------------+------------+------------+------------|
| 16MB | (1) 4M x | None | None | None |
| | 36 | | | |
|--------+------------+------------+------------+------------|
| 20MB | (1) 1M x | (1) 4M x | None | None |
| | 36 | 36 | | |
|--------+------------+------------+------------+------------|
| 20MB | (1) 1M x | (1) 2M x | (1) 2M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 24MB | (1) 1M x | (1) 1M x | (1) 2M x | (1) 2M x |
| | 36 | 36 | 36 | 36 |
|--------+------------+------------+------------+------------|
| 24MB | (1) 2M x | (1) 2M x | (1) 2M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 24MB | (1) 1M x | (1) 1M x | (1) 4M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 28MB | (1) 1M x | (1) 1M x | (1) 4M x | (1) 1M x |
| | 36 | 36 | 36 | 36 |
|--------+------------+------------+------------+------------|
| 28MB | (1) 1M x | (1) 2M x | (1) 2M x | (1) 2M x |
| | 36 | 36 | 36 | 36 |
|--------+------------+------------+------------+------------|
| 32MB | (1) 2M x | (1) 2M x | (1) 4M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 32MB | (1) 2M x | (1) 2M x | (1) 2M x | (1) 2M x |
| | 36 | 36 | 36 | 36 |
|--------+------------+------------+------------+------------|
| 32MB | (1) 4M x | (1) 4M x | None | None |
| | 36 | 36 | | |
|--------+------------+------------+------------+------------|
| 32MB | (1) 8M x | None | None | None |
| | 36 | | | |
|--------+------------+------------+------------+------------|
| 36MB | (1) 1M x | (1) 4M x | (1) 4M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 36MB | (1) 1M x | (1) 8M x | None | None |
| | 36 | 36 | | |
|--------+------------+------------+------------+------------|
| 40MB | (1) 1M x | (1) 1M x | (1) 4M x | (1) 4M x |
| | 36 | 36 | 36 | 36 |
|--------+------------+------------+------------+------------|
| 48MB | (1) 4M x | (1) 4M x | (1) 4M x | None |
| | 36 | 36 | 36 | |
|--------+------------+------------+------------+------------|
| 48MB | (1) 4M x | (1) 8M x | None | None |
| | 36 | 36 | | |
|--------+------------+------------+------------+------------|
| 52MB | (1) 1M x | (1) 4M x | (1) 4M x | (1) 4M x |
| | 36 | 36 | 36 | 36 |
|--------+------------+------------+------------+------------|
| 64MB | (1) 4M x | (1) 4M x | (1) 4M x | (1) 4M x |
| | 36 | 36 | 36 | 36 |
|--------+------------+------------+------------+------------|
| 64MB | (1) 8M x | (1) 8M x | None | None |
| | 36 | 36 | | |
|--------+------------+------------+------------+------------|
| 68MB | (1) 1M x | (1) 8M x | (1) 8M x | None |
| | 36 | 36 | 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.. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON'T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|---------+------------+------------+------------+-----------|
| 80MB | (1) 4M x | (1) 8M x | (1) 8M x | None |
| | 36 | 36 | 36 | |
|---------+------------+------------+------------+-----------|
| 96MB | (1) 8M x | (1) 8M x | (1) 8M x | None |
| | 36 | 36 | 36 | |
|---------+------------+------------+------------+-----------|
| 100MB | (1) 1M x | (1) 8M x | (1) 8M x | (1) 8M x |
| | 36 | 36 | 36 | 36 |
|---------+------------+------------+------------+-----------|
| 112MB | (1) 4M x | (1) 8M x | (1) 8M x | (1) 8M x |
| | 36 | 36 | 36 | 36 |
|---------+------------+------------+------------+-----------|
| 128MB | (1) 8M x | (1) 8M x | (1) 8M x | (1) 8M x |
| | 36 | 36 | 36 | 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. |
+------------------------------------------------------------+