Datatech Enterprises Apex 386SX/20 User Manual page 19

1-3 Features
4 Chapter 1: System Overview
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Intel 80386SX-20 microprocessor—32-bit CPU with a 16-
bit external data bus and a 24-bit external address bus
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Intel 80387SX-20 coprocessors optional
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Switchable between 10MHz Normal mode and 20MHz
Turbo mode by either a software-switch or a hardware switch
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Onboard battery backup for the CMOS configuration table
and a real-time clock
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RAM subsystem of 512Kl3,640KB, 1 MB, 1.5MB, 2MB,
3MB, 4MB and 5MB
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Eight expansion slots — six 16 bit slots and two 8 bit slots
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Sixteen-level interrupt
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Seven-channel DMA for disk and special I/O
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64KB legal BIOS
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Four-layer mainboard
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LIM 4.0 EMS support
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Shadow RAM support
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Choice of either 44256 DIP or 256k/1M SIMM DRAM
modules with 80ns
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Page/Interleaved DRAM access method support
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Power fail detect circuit
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Address pipeline support