253. Vectored interrupt is an interrupt that takes the program to a vector location. TRAP vectors to 0024 H, RST 7.5 to 003 CH, RST 6.5 to 0034 H and
A. RST 5.5
B.RST 6.5
C. 24 H to 48 H
D.RST 5.5 to 002 CH

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254. TRAP is where as RST 7.5, RST 6.5, RST 5.5 are
A. maskable, non-maskable
B. maskable, maskable
C. non-maskable, non-maskable
D. non-maskable, maskable

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255. Which interrupts are masked
A.5.5
B.6.5
C.7.5
D. none

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256. How many outputs are there in the output of a 10-bit D/A converter?
A.1000
B.1023
C.1024
D.1224

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257. In 8156, the lower time byte is addressed with 24 H, and the upper times byte with
A. 20 H
B. 23 H
C. 24 H
D. 25 H

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258. In 8355, the ROM is organized as words of 8 bits each
A.2000
B.2048
C.4048
D.8355

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259. Status register in the 8156 contains information about
A. the timer
B. the ports
C. both (a) and (b) above
D. none of the above

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