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Specifications,
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 x100h through x3FFh 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:
•
s000h through s0FFh for EISA expansion slot
•
s400h through s4FFh for EISA expansion slot
•
s800h through s8FFh for EISA expansion slot
•
sC00h through sCFFh for EISA expansion slot
(s = EISA bus slot number, the motherboard is always 0)
Enterprise-IV EISA VLB Motherboard User's Guide
Continued
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