Test your logic using the simulator on the provided link. Using the link for LMC

Question

Test your logic using the simulator on the provided link. Using the link for LMC papers and use the simulator (http://peterhigginson.co.uk/LMC/)

PLEASE provide the following:

1.          Complete LMC code for each problem.

2.          Print screen of the output results of each problem after you run the program.

3. for each problem submit the above two items in a word documents for each problem.

  

Question

Write a Little Man program that accepts 3 values as input and outputs them in order of size, largest to smallest.

Little Man Computer references

Numeric code

Mnemonic code

Instruction

Description

1xx

ADD

ADD

Add the value stored in mailbox xx to whatever value is currently on the accumulator (calculator).

Note: the contents of the mailbox are not changed, and the actions of the accumulator (calculator) are not defined for add instructions that cause sums larger than 3 digits.

2xx

SUB

SUBTRACT

Subtract the value stored in mailbox xx from whatever value is currently on the accumulator (calculator).

Note: the contents of the mailbox are not changed, and the actions of the accumulator are not defined for subtract instructions that cause negative results - however, a negative flag will be set so that 8xx (BRP) can be used properly.

3xx

STA

STORE

Store the contents of the accumulator in mailbox xx (destructive).

Note: the contents of the accumulator (calculator) are not changed (non-destructive), but contents of mailbox are replaced regardless of what was in there (destructive)

5xx

LDA

LOAD

Load the value from mailbox xx (non-destructive) and enter it in the accumulator (destructive).

6xx

BRA

BRANCH(unconditional)

Set the program counter to the given address (value xx). That is, value xx will be the next instruction executed.

7xx

BRZ

BRANCH IF ZERO (conditional)

If the accumulator (calculator) contains the value 000, set the program counter to the value xx. Otherwise, do nothing.

Note: since the program is stored in memory, data and program instructions all have the same address/location format.

8xx

BRP

BRANCH IF POSITIVE (conditional)

If the accumulator (calculator) is 0 or positive, set the program counter to the value xx. Otherwise, do nothing.

Note: since the program is stored in memory, data and program instructions all have the same address/location format.

901

INP

INPUT

Go to the INBOX, fetch the value from the user, and put it in the accumulator (calculator)

Note: this will overwrite whatever value was in the accumulator (destructive)

902

OUT

OUTPUT

Copy the value from the accumulator (calculator) to the OUTBOX.

Note: the contents of the accumulator are not changed (non-destructive).

0

HLT

HALT

Stop working.

DAT

DATA

This is an assembler instruction which simply loads the value into the next available mailbox. DAT can also be used in conjunction with labels to declare variables. For example, DAT 984 will store the value 984 into a mailbox.

Numeric code

Mnemonic code

Instruction

Description

1xx

ADD

ADD

Add the value stored in mailbox xx to whatever value is currently on the accumulator (calculator).

Note: the contents of the mailbox are not changed, and the actions of the accumulator (calculator) are not defined for add instructions that cause sums larger than 3 digits.

2xx

SUB

SUBTRACT

Subtract the value stored in mailbox xx from whatever value is currently on the accumulator (calculator).

Note: the contents of the mailbox are not changed, and the actions of the accumulator are not defined for subtract instructions that cause negative results - however, a negative flag will be set so that 8xx (BRP) can be used properly.

3xx

STA

STORE

Store the contents of the accumulator in mailbox xx (destructive).

Note: the contents of the accumulator (calculator) are not changed (non-destructive), but contents of mailbox are replaced regardless of what was in there (destructive)

5xx

LDA

LOAD

Load the value from mailbox xx (non-destructive) and enter it in the accumulator (destructive).

6xx

BRA

BRANCH(unconditional)

Set the program counter to the given address (value xx). That is, value xx will be the next instruction executed.

7xx

BRZ

BRANCH IF ZERO (conditional)

If the accumulator (calculator) contains the value 000, set the program counter to the value xx. Otherwise, do nothing.

Note: since the program is stored in memory, data and program instructions all have the same address/location format.

8xx

BRP

BRANCH IF POSITIVE (conditional)

If the accumulator (calculator) is 0 or positive, set the program counter to the value xx. Otherwise, do nothing.

Note: since the program is stored in memory, data and program instructions all have the same address/location format.

901

INP

INPUT

Go to the INBOX, fetch the value from the user, and put it in the accumulator (calculator)

Note: this will overwrite whatever value was in the accumulator (destructive)

902

OUT

OUTPUT

Copy the value from the accumulator (calculator) to the OUTBOX.

Note: the contents of the accumulator are not changed (non-destructive).

0

HLT

HALT

Stop working.

DAT

DATA

This is an assembler instruction which simply loads the value into the next available mailbox. DAT can also be used in conjunction with labels to declare variables. For example, DAT 984 will store the value 984 into a mailbox.

Explanation / Answer

00 : 901 inp Get data from user and store it 01 : 390 sto 90 02 : 901 inp 03 : 391 sto 91 04 : 901 inp 05 : 392 sto 92 06 : 590 lda 90 Load First 07 : 291 sub 91 Sub Second 08 : 812 brp 12 If Positive, First is larger, go output First 09 : 391 lda 91 Load Second 10 : 902 out Output Second 11 : 614 br 14 Always Branch to compare Second and Third 12 : 390 lda 90 Load First 13 : 902 out Output First 14 : 591 lda 91 Load Second 15 : 292 sub 92 Sub Third 16 : 820 brp 20 If Positive, Second is larger, go output 17 : 392 lda 92 Load Third 18 : 902 out Output Third 19 : 622 br 22 Always Branch 20 : 391 lda 91 Load Second 21 : 902 out Output Second 22 : 590 lda 90 Load First 23 : 291 sub 91 Sub Second 24 : 827 brp 27 If Positive, First is larger, go output 25 : 591 lda 91 Load Second 26 : 902 out Output Second 27 : 590 lda 90 Load First 28 : 902 out Output First 29 : 000 hlt 90 : First 91 : Second 92 : Third

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