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CHAPTER $2$ Computer Codes, Programming, and Operating Systems

Section $2\mathrm{.}2$

$2\mathrm{.}5$ For each binary number shown in the following table, give its equivalent value assuming the number is represented in the code indicated. The first row is give as an example.

$\backslash$table$[[$Binary Number,Code,,$],[$Unsigned Binary,$8-$Bit Signed Binary,Odd Paity ASCII,BCD$],[10011000,152,-104,$CAN,$98],[01100001,,,,],[01110011,,,,],[10000101,,,,],[10010110,,,,]]$

$2\mathrm{.}6$ Determine the largest and smallest $($most negative$)$ decimal numbers that cant represented using $16-$bit signed binary numbers.

$2\mathrm{.}7$ Determine the largest decimal number that can be represented with:

$($a$)8-$bit unsigned binary

$($b$)$ Positive $8-$bit signed binary

$($c$)8-$bit BCD

$2\mathrm{.}8$ The checksum byte is computed by calculating the sum of the other bytes in a data block and then forming the two's complement of that sum. Assume the four$-$byte block $10H,23H,45H,$ and $04$ H is to be transmitted. Calculate the value of the checksum character. Check your result by showing that the sum of the four bytes plus the checksum byte is $00($ignoring any carries$).$

Section $2\mathrm{.}3$

$2\mathrm{.}9$ Match the terms in the list below $($a$-$i$)$ with the specified phrases $(1-9).$

$($a$)$ op$-$code

$($b$)$ source code

$($c$)$ mnemonic

$($d$)$ assembler

$($e$)$ high$-$level language

$($f$)$ operand

$($g$)$ object code

$($h$)$ compiler

$($i$)$ editor

Matching phrases:

used to create source code

abbreviation for an assembly language instruction

convert instruction mnemonics to machine code

machine instructions in binary or hexadecimal form

instruction operation

data source$/$destination that is to be operated on by an instruction

convert high$-$level language instructions to machine code