American Megatrends AMI 386SX, Preliminary Manual, Page: 30 / 52

The system board is approximately 8.5 by 13 inches and uses very large scale
integration (VLSI) technology. It has the following features:
*80386SX Microprocessor
*8/16 MHz System Clock
*Optional EGA/VGA RAM Shadow
*Optional 80387SX Numeric Coprocessor (16 MHz)
*Upto 8 MB of on board page interleaved memory
*System support function:
-7 Channel Direct Memory Access (DMA)
-16 level interrupt
-Three programmable timers
-System clock
*User selectable 64KB/128KB ROM subsystem
*User selectable synchronized system board clock switching option for
reducing the processor clock frequency to 8MHz
*8MHz I/O bus timing compatibility
*Speaker attachment
*CMOS (Complementary Metal Oxide Semiconductor) RAM to maintain system
configuration
*Real-Time clock
*Optional battery backup for CMOS configuration table and Real-Time Clock
*Keyboard attachment
*8.5 by 13 inch board: Extended XT form-factor
*8 input/output (I/O) slots:
- 6 62/36 pin 16-bit card-edge sockets
- 2 62 pin 8-bit card-edge sockets
3.1 The Microprocessor
The 80386SX is a medium performance 32-bit microprocessor designed for
Multitasking operating systems. The processor can address up to 16-Megabytes
of physical memory and 64-Terabytes (1-Terabyte = 1-K Gigabyte) of virtual
memory. It has integrated memory management and protection architecture which