Configurable Options
MEMORY CHIP SIZE SELECTION
The previous section discussed the need to configure certain socket
pins for different chip sizes and types. The chip size also determines
which address lines must be used by the decoders to generate the eight
socket/chip selects. Preprogrammed PALs are used on the ZT 8825 to
decode the appropriate address bits based on the chip sizes used. The
chip sizes are set on six-segment DIP switch 1 (SW1), which provides
the inputs to the PALs. Switch 1 positions 3, 2, and 1 select the chip
sizes for Row A. Switch 1 positions 6, 5, and 4 select the chip sizes
for Row B. Table 5-4 provides the chip sizes that correspond to each
switch setting.
5-6
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