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TT-16.005
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1991-08-21
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47 lines
AMI TECH TIP
TECH TIP NO. 16.005
DATE: August 19, 1991
BOARD TYPE: Enterprise II, Series-16
BOARD REVISION: D, D1, or E
BOARD FREQUENCY: 25MHz or 33MHz
ORIGINATOR: Rex Wade
RELEASED BY: Documentation Control
PROBLEM: In order to have a system approved as a Banyan VINES server,
a Banyan ICA card must be installed. This card has 128KB
(20000 hex bytes) of dual ported memory that must be located
on a 128K (20000 hex) boundary. Addresses A0000 to BFFFF
(hex) are reserved for video memory. Addresses C0000 to
DFFFF (hex) are reserved for video, disk, and other
peripheral BIOS. Addresses E0000 to FFFFF (hex) are used by
the system BIOS. This means that some other portion of
memory must be used. However if 16MB of DRAM is installed,
there are no other locations below the 16MB boundary that
are available.
SOLUTION: By changing the PAL at location U19, the addresses between
80000 to 9FFFF (hex) can be disabled to the DRAM allowing
this address range to be used by the Banyan ICA card memory.
This will limit the base memory (below 1MB) to 512KB instead
of 640KB and reduce the overall memory by 128KB. The new
PAL number is H20D1611 (20L8D) for 25MHz boards and
H20E1611 (20L8-7) for 33MHz boards. The new PAL checksum is
57BE for both 25MHz and 33MHz boards.
This PAL may be ordered separately and will be sold
separately. The customer will be responsible for changing
the PAL on the motherboard. This will eliminate boards
being shipped with the wrong PAL.
The only noticeable difference in motherboards with this
PAL installed will be that the base memory will be limited
to 512KB instead of 640KB and the overall memory is reduced
by 128KB.