This address space is divided in internal and
external memory portions.
For the external memory a circuit with 74HC138
mades this possible suddivision.
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The address space of 68HC11 is 64K from $0000 to $FFFF
This address space is divided in internal and external memory portions. For the external memory a circuit with 74HC138 mades this possible suddivision. |
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Decode circuit with HC138
for eprom with maxsize of 32K (27C256) and RAM with maxsize of 16K 8 * Read and 8 * WRITE |
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Eprom and RAM |
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LCD circuit
The WRITE-signal must be inverted |