Specifications

EISA and ISA Bus Support
14.7 EISA Bus Support on DEC 2000
14.7.8.4.2 EISA Memory Addresses If your board needs EISA MEM space, you
are restricted to choosing something in the range 80000h - 100000h. Depending
on the configuration, choose something other than:
A0000-C7FFF - assigned to the Compaq VGA card
D0000-DFFFF - assigned to the DE422 card, or a second DEFEA
card
E0000- EFFFF - assigned to the DEFEA FDDI card if present,
or a second DE422 card
Note that these memory requirements prohibit an EISA bus configuration
consisting of 2 DE422 cards and 2 DEFEA cards. There is not enough memory
space to go around.
14.7.8.4.3 ISA I/O Port Addresses The only port addresses being used on the
DEC 2000 system are that of the floppy port. The floppy is using ports 3F2-3F7h.
If more ISA devices are plugged into the EISA bus, they will also be assigned port
addresses by the ECU.
To connect new devices, which will not show up in the SYSMAN IO SHOW BUS
display, you must specify the virtual address of the base of the EISA I/O space.
This virtual address can be obtained from the IO SHOW BUS display in the line
associated with the floppy. All ISA devices share the same base virtual address
and the floppy CSR shown is the base of EISA I/O space. Alternatively, use the
ANALYZE/SYS facilty to look at the ADP$Q_CSR Field of the EISA ADP to get
the CSR parameter value for new ISA cards.
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