Discussion
The minimum memory size to implement a BCD to seven segment decoder will be :
Answer: B
The minimum memory size is 10 bytes, as the key states.
A BCD to seven-segment decoder can be built as a look-up table in ROM. The input is a 4-bit BCD digit and the output is the seven segment lines a to g, which fit in one byte. Only the digits 0 to 9 are valid BCD, so ten locations of one byte each are enough: 10 bytes.
A physical ROM with four address lines has 16 locations, so a chip would be 16 bytes (option A); the six codes 1010 to 1111 are never used in BCD, which is why the minimum is 10. 8 bytes could hold only the digits 0 to 7, and 1 k byte is far larger than needed.
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