Page 4
User Adjustments
Page 4
Blue Chip Technology Ltd.
01271014.doc
2.0
USER ADJUSTMENTS
2.1
Selecting the Base Address
The board may be located in any 62 pin slot in the PC motherboard but must be
set up to appear at a specified position (or ‘address’) in the port map. Available
positions are shown in the IBM-PC Technical Reference Guide. However, for
those who do not possess a copy of this document a good place is the location
normally allocated to the prototyping card as supplied by IBM. This address is
300 Hex or 768 decimal.
All Blue Chip Technology cards are preset to this address at the factory.
However, no two devices should be used while set to the same address since
contention will occur and neither board will work. If your machine contains a
card with a conflicting address then another reasonably safe address is 200 to
21F (Hex).
A set of links is provided on the board to set the base address of the board
within the IBM-PC port map. The address is in binary with the presence of a
link representing a 0 and the absence of a link representing a 1.
To set the base address to 768 decimal (300 Hex) set the following pattern on
the links as indicated:
Figure 1 - Selecting the Base Address
Note: View board with back panel on RHS. Top 6 Bits of port address on links.
40
10
20
LSB
200
80 100
MSB
More example addresses are shown in Appendix A. Note: No two cards must
occupy the same address.