path: root/1.4.3.1.lyx

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\begin_layout Standard
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\backslash
rexerc3[22]
\end_layout

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Write the 
\family typewriter
MOVE
\family default
 routine,
 which is missing from the program in the text (operation code 7).
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\backslash
answer 
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The following is not tested.
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inline false
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MOVE    J3Z  CYCLE
\end_layout

\begin_layout Plain Layout
        ENTA 0,3      
;

\lang english
 Calculate time
\end_layout

\begin_layout Plain Layout
        INCA 1,3
\end_layout

\begin_layout Plain Layout
        STA  TIME(0:2)
\end_layout

\begin_layout Plain Layout
        LD1  A1REG    
;

\lang english
 Load destination position
\end_layout

\begin_layout Plain Layout
        LDA  SIGN1    
;

\lang english
 Check positive sign
\end_layout

\begin_layout Plain Layout
        JAP  1H
\end_layout

\begin_layout Plain Layout
        J1NZ MEMERROR
\end_layout

\begin_layout Plain Layout
        STZ  SIGN1(0:0)
\end_layout

\begin_layout Plain Layout
1H      J3Z  CYCLE    
;

\lang english
 Check loop variable
\end_layout

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        CMP1 =BEGIN=  
;

\lang english
 Check destination
\end_layout

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        JGE  MEMERROR
\end_layout

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        CMP5 =BEGIN=  
;

\lang english
 Check source
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\begin_layout Plain Layout
        JGE  MEMERROR
\end_layout

\begin_layout Plain Layout
        LDA  0,5      
;

\lang english
 Move value
\end_layout

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        STA  0,1
\end_layout

\begin_layout Plain Layout
        DEC3 1        
;

\lang english
 Next iteration
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        INC1 1
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        INC5 1
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        ST1  I1REG
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        JMP  1B
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\backslash
rexerc5[24]
\end_layout

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Determine the time required to simulate the 
\family typewriter
LDA
\family default
 and 
\family typewriter
ENTA
\family default
 operators,
 compared with the actual time for 
\family typewriter
MIX
\family default
 to execute these operators directly.
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\backslash
answer 
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It takes 2 cycles to run an 
\family typewriter
LDA
\family default
 instruction and 1 cycle to run an 
\family typewriter
ENTA
\family default
 instruction.
 However,
 it takes 95 cycles to simulate 
\family typewriter
LDA
\family default
,
 plus 5 if the sign is not included in the fields to load,
 and 52 to simulate 
\family typewriter
ENTA
\family default
,
 plus 2 if the value to load is not zero,
 and we also have to add 15 cycles to both if the index field is nonzero.
 This 
\emph on
more or less
\emph default
 matches the solution but I'm not spending any more effort on 
\emph on
counting cycles
\emph default
.
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