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94017FG.TXT
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1994-03-10
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Technical Support Note
======================
Reference TSN No. : NA
Product(s) involve : VBFS200
Third party product(s) : AST - Premmia LX P/60
Subject
-------
1. "Error found on frame buffer setting. The base address you specified
..... is possibly a ROM region ...." when setting up the VBFS200 frame
buffer address.
2. "Error found on frame buffer setting. The base address you specified
....... probably has been used by your expanded memory manager ...."
when setting up the VBFS200 frame buffer address.
Description
-----------
AST Premmia LX P/60 PC user will encounter the above-mentioned problems
when attempting to setup the VBFS200 frame buffer address. The reason is
this PC has a unique way of mapping the memory addresses through its BIOS
CMOS setup. This prevents the VBFS200 setup program from detecting any
free UMB. There are two options in the Advanced CMOS setup to affect the
memory mapping, the following are their default values:
a. Disable shadow memory size : Disabled
b. Disable shadow memory base : C8000h
Solution/Action
---------------
The problem can be solved by changing the above option to the following
settings:
a. Disable shadow memory size : 64K
b. Disable shadow memory base : D0000h
The value of "Disable shadow memory base" plus the "Disable shadow memroy
size" must be sufficient to cover the frame buffer address of VBFS200.
10th March, 1994
Issue No: TSN94017
Technical Services Department, Creative Technology Ltd