Chapter 2 Description
6
Specifications,
Continued
Cache Memory
The 256 KB secondary (external) cache memory uses a write-through or write-back caching algorithm. Up
to 64 MB of system memory is cached. There are zero wait states for cache memory read and write for
motherboards operating at speeds up to 33 MHz. Burst mode is supported. In addition, 80486 processors
have an 8 KB internal cache memory. All of system memory is cached in the 80486 internal cache memory.
Both internal and external cache memory is enabled by pressing <Ctrl> <Alt> <Shift> <+> and disabled by
pressing <Ctrl> <Alt> <Shift> <->
SRAM Type
The Enterprise-IV EISA VLB motherboard uses 15 ns 32 KB x 8 SRAM DIPs for cache memory.
ROM
The Enterprise-IV EISA VLB motherboard has 128 KB of Read Only Memory in an EPROM used for the
system BIOS at E0000h - FFFFFh.
Shadow RAM
AMIBIOS Setup allows you to selectively shadow the 128 KB system BIOS, video BIOS (in 32 KB
increments), or Adaptor ROM BIOS (in 32 KB increments) in ADVANCED CMOS SETUP in AMIBIOS
Setup.
EISA Configuration Utility
The American Megatrends EISA Configuration Utility is provided with the Enterprise-IV EISA VLB
motherboard. A diskette containing two EISA Configuration files (!AMI87A1.CFG and AMI87A1.OVL) is
also supplied.
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