Microcontroller programming: Find the maximum number and store it in the BIG unit

Microcontroller programming: Find the maximum number and store it in the BIG unit.
Assume that the internal RAM stores a group of unsigned numbers starting from the LIST unit, with the number of data being 30. Program to find the maximum number and store it in the BIG unit.
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Best answer:

The procedure is as follows:

    MOV BIG, #0
    MOV R0, #LIST
    MOV R2, #30
CHA:
    MOV A, @R0
    CJNE A, BIG, QQQ
QQQ:
    JC WWW
    MOV BIG, A
WWW:
    INC R0
    DJNZ R2, CHA
    SJMP $
END

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Another question:

Microcontroller programming question is urgent!!! Experts please come in, I will give you points!!! 
Reward points: 20 | Solved time: 2010-4-11 21:41 |

1. Program the high 4 bits in the external data memory 2100H unit to be "1", and the rest of the bits to be "0"
2. Program the 0th and 7th bits in the internal data memory 40H unit to be "1", and the rest of the bits to be inverted.
Add comments, thank you
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Best answer:

1. Program the high 4 bits in the external data memory 2100H unit to "1" and the rest to "0"

MOV DPTR, #2100H ; set address
MOV A, #11110000B ; prepare digital
MOVX @DPTR, A ; send to external data memory 2100H unit

2. Program the 0th and 7th bits of the internal data memory 40H unit to "1" and invert the remaining bits.

MOV A, 40H
ORL A, #10000001B ; or, that is, adding according to the "bit"
XRL A, #01111110B ; using 1 XOR, equivalent to taking the inverse
MOV 40H, A

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Postscript:
The logic operation instructions of the 51 single-chip microcomputer can be directly performed on the RAM address on the chip.
Using this method, only two instructions are needed:

ORL 40H, #10000001B; or, that is, adding according to the "bit"
XRL 40H, #01111110B; using 1 XOR, which is equivalent to AND negation

. This method is too simple!
However, if it is for homework, I am afraid it will not work, because teachers all hope to solve it with stupid methods.