Enterprise-IV EISA VLB Motherboard User's Guide
9
Specifications,
Continued
Timer Features
The Enterprise-IV has five programmable 16-bit counter/timers.
System Arbiter
The Enterprise-IV has standard EISA arbitration features.
Refresh Generation
The Enterprise-IV has a refresh generation feature.
I/O Capability
The Enterprise-IV accesses 32-, 16-, or 8-bit memory devices and 32-, 16-, or 8-bit I/O devices on both the
VL-Bus and the EISA bus.
I/O Address Space
The Enterprise-IV uses I/O addresses
x
100h through
x
3FFh for ISA compatible I/O (
x
= a "don't care"
character which does not affect mapping location. For example, I/O port addresses 0100h, 1100h, 2100h,
and 3100h map to the same location).
The Enterprise-IV also uses the following EISA I/O port addresses:
•
s
000h through
s
0FFh for EISA expansion slot
•
s
400h through
s
4FFh for EISA expansion slot
•
s
800h through
s
8FFh for EISA expansion slot
•
s
C00h through
s
CFFh for EISA expansion slot
(
s
= EISA bus slot number, the motherboard is always 0)
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