AMERICAN MEGATRENDS, INC.
ATLAS PCI PENTIUM ISA
| 
 Processor  | 
 Pentium  | 
| 
 Processor Speed  | 
 90/100MHz  | 
| 
 Chip Set  | 
 American Megatrends  | 
| 
 Max. Onboard DRAM  | 
 128MB  | 
| 
 Cache  | 
 256/512KB  | 
| 
 BIOS  | 
 AMI  | 
| 
 Dimensions  | 
 330mm x 218mm  | 
| 
 I/O Options  | 
 32-bit PCI bus slots (4), floppy drive interface, IDE interface (2), green PC feature, parallel port, PS/2 mouse port, serial ports (2), green PC monitor connector  | 
| 
 NPU Options  | 
 None  | 
| 
 CONNECTIONS  | |||
| 
 Purpose  | 
 Location  | 
 Purpose  | 
 Location  | 
| 
 Green PC power connector  | 
 J1  | 
 Power LED & keylock  | 
 J15  | 
| 
 Serial port 1  | 
 J4  | 
 Speaker  | 
 J17  | 
| 
 Serial port 2  | 
 J5  | 
 Reset switch  | 
 J18  | 
| 
 Parallel port  | 
 J7  | 
 Turbo switch  | 
 J20  | 
| 
 Floppy drive interface  | 
 J8  | 
 Turbo LED  | 
 J24  | 
| 
 IDE interface (secondary)  | 
 J10  | 
 Green PC monitor connector  | 
 J25  | 
| 
 IDE interface (primary)  | 
 J11  | 
 IDE interface IDE  | 
 J28  | 
| 
 PS/2 mouse port  | 
 J13  | 
 32-bit PCI bus slots  | 
 SL1 - SL4  | 
| 
 USER CONFIGURABLE SETTINGS  | |||
| 
 Function  | 
 Jumper  | 
 Position  | |
| 
 »  | 
 Cache memory type select write back  | 
 J29  | 
 Open  | 
| 
 Cache memory type select write through  | 
 J29  | 
 Closed  | |
| 
 »  | 
 Parallel port IRQ select IRQ7  | 
 J37  | 
 pins 1 & 2 closed  | 
| 
 Parallel port IRQ select IRQ5  | 
 J37  | 
 pins 2 & 3 closed  | |
| 
 »  | 
 Serial port 2 IRQ select IRQ3  | 
 J38  | 
 pins 1 & 2 closed  | 
| 
 Serial port 2 IRQ select IRQ4  | 
 J38  | 
 pins 2 & 3 closed  | |
| 
 »  | 
 Serial port 1 IRQ select IRQ4  | 
 J39  | 
 pins 1 & 2 closed  | 
| 
 Serial port 1 IRQ select IRQ3  | 
 J39  | 
 pins 2 & 3 closed  | |
| 
 »  | 
 Onboard mouse IRQ12 enabled  | 
 J40  | 
 pins 1 & 2 closed  | 
| 
 Bus mouse IRQ12 enabled  | 
 J40  | 
 pins 2 & 3 closed  | |
| 
 »  | 
 Factory configured - do not alter  | 
 J47  | 
 Open  | 
| 
 »  | 
 CMOS memory normal operation  | 
 J48  | 
 Open  | 
| 
 CMOS memory clear  | 
 J48  | 
 Closed  | |
| 
 »  | 
 Factory configured - do not alter  | 
 J51  | 
 Open  | 
| 
 DRAM CONFIGURATION  | ||
| 
 Size  | 
 Bank 0  | 
 Bank 1  | 
| 
 2MB  | 
 (2) 256K x 36  | 
 NONE  | 
| 
 4MB  | 
 (2) 256K x 36  | 
 (2) 256K x 36  | 
| 
 4MB  | 
 (2) 512K x 36  | 
 NONE  | 
| 
 8MB  | 
 (2) 512K x 36  | 
 (2) 512K x 36  | 
| 
 8MB  | 
 (2) 1M x 36  | 
 NONE  | 
| 
 16MB  | 
 (2) 1M x 36  | 
 (2) 1M x 36  | 
| 
 16MB  | 
 (2) 2M x 36  | 
 NONE  | 
| 
 20MB  | 
 (2) 512K x 36  | 
 (2) 2M x 36  | 
| 
 32MB  | 
 (2) 2M x 36  | 
 (2) 2M x 36  | 
| 
 32MB  | 
 (2) 4M x 36  | 
 NONE  | 
| 
 36MB  | 
 (2) 512K x 36  | 
 (2) 4M x 36  | 
| 
 40MB  | 
 (2) 1M x 36  | 
 (2) 4M x 36  | 
| 
 48MB  | 
 (2) 2M x 36  | 
 (2) 4M x 36  | 
| 
 64MB  | 
 (2) 4M x 36  | 
 (2) 4M x 36  | 
| 
 64MB  | 
 (2) 8M x 36  | 
 NONE  | 
| 
 80MB  | 
 (2) 2M x 36  | 
 (2) 8M x 36  | 
| 
 128MB  | 
 (2) 8M x 36  | 
 (2) 8M x 36  | 
| 
 128MB  | 
 (2) 16M x 36  | 
 NONE  | 
| 
 CACHE CONFIGURATION  | |
| 
 Size  | 
 Bank 0  | 
| 
 256KB  | 
 (8) 32K x 8  | 
| 
 512KB  | 
 (8) 64K x 8  | 
| 
 CACHE JUMPER CONFIGURATION  | |||
| 
 Size  | 
 J21  | 
 J22  | 
 J23  | 
| 
 256KB  | 
 pins 1 & 2 closed  | 
 pins 1 & 2 closed  | 
 pins 1 & 2 closed  | 
| 
 512KB  | 
 pins 2 & 3 closed  | 
 pins 2 & 3 closed  | 
 pins 2 & 3 closed  | 
| 
 CPU OUTPUT SIGNAL BUFFER CONFIGURATION  | ||
| 
 Output signal buffer  | 
 J30  | 
 J32  | 
| 
 Normal system  | 
 Open  | 
 Open  | 
| 
 Loaded system  | 
 Closed  | 
 Open  | 
| 
 Extra loaded system  | 
 Closed  | 
 Closed  | 
| 
 CPU SPEED CONFIGURATION  | |
| 
 Speed  | 
 JP33  | 
| 
 60/66/90i/100iMHz  | 
 Closed  | 
| 
 50/100iMHz  | 
 Open  | 
| 
 3.3 VOLT POWER SOURCE CONFIGURATION (INTERNAL)  | ||
| 
 J3  | 
 J34  | 
 P3 & P4  | 
| 
 Open  | 
 pins 1 & 2, 3 & 4, 5 & 6 closed  | 
 Open  | 
| 
 3.3 VOLT POWER SOURCE CONFIGURATION (EXTERNAL)  | ||
| 
 J3  | 
 J34  | 
 P3 & P4  | 
| 
 pins 1 & 2, 3 & 4, 5 & 6 closed  | 
 Open  | 
 Closed  | 
| 
 PARALLEL PORT DMA CONFIGURATION  | ||
| 
 DMA channel  | 
 J43  | 
 J44  | 
| 
 None  | 
 Open  | 
 Open  | 
| 
 DRQ0  | 
 pins 1 & 2 closed  | 
 pins 1 & 2 closed  | 
| 
 DRQ1  | 
 pins 3 & 4 closed  | 
 pins 3 & 4 closed  | 
| 
 DRQ3  | 
 pins 5 & 6 closed  | 
 pins 5 & 6 closed  |