Specifications

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t µ EPC-2 HARDWARE REFERENCE
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4. Programming Interface
This chapter describes the EPC-2 as seen by a program. Wherever possible, users
should avoid direct use of most of these facilities. Hardware features in
common with standard PCs should be accessed by standard BIOS calls. Hardware
unique to EPC-2, such as the VXIbus interface should be accessed through the
.i.EPConnect; .i.Bus Manager;, an easy-to-use, high-level interface that frees
you from most machine-dependent considerations.
Memory Map
.i.memory map;The 232 byte physical address space seen by the 386 is mapped as
follows:
Range Content
00000000 0009FFFF DRAM (first 640 KB)
000A0000 000BFFFF Video RAM
000C0000 000CFFFF Write-protected DRAM containing VGA video BIOS
000D0000 000DFFFF In EPC-2, mapped to interface of optional EPC-2AM
module. In EPC-2x, mapped to the EXMbus
000E0000 000EFFFF Mappable window onto VXI data transfer bus
000F0000 000FFFFF Write-protected DRAM containing BIOS
00100000 00FEFFFF Extended memory DRAM
00FF0000 00FFFFFF Mapped to BIOS ROM for PC compatibility
02000000 FEFFFFFF Mapped to VXIbus data-transfer bus .i.A32; space
FF000000 FFFFFFFF 386 upper ROM area
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