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AST RESEARCH TECHNICAL BULLETIN TB-0020 6-18-84
COM 2 SELECTION IN IBM PC-2 EARLY MODELS
It has been reported that there are a number of IBM PC-2
motherboards, earlier models, that do not allow COM 2 selection.
There are two distinctly physical features:
1. The motherboard is brown in color.
2. In between banks 02 and 03, the silkscreen "YB" exists (see
figure 1).
NOTE: As a portion of the data is in pictorial form, it is not
included here. To obtain a complete copy of this technical
bulletin, contact:
AST RESEARCH, INC.
2121 Alton Avenue
Irvine, California 92714
ATTENTION: Product Support
(Technical Bulletin)