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Appendix A
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Base Address Selection
Each column can be physically represented on the board by a pair of pins. In
practice, the boards cover a range of addresses (usually 16 Decimal). Therefore the
low order four bits are not included, but two higher order bits are added. This
gives an address range of 0 to 3F0 Hex . The following diagram shows a typical
set of pins.
Here a link is fitted to denote a binary or logic “0”, or left open to indicate a
binary or logic “1”. The example shows a base address setting of 300 Hex.
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