how to write byte in 8051 Correctly

[Steaker]

i have a hex code and need to write it in 8051

if the hex code is
"11 22 33 44 55 66 77 88"
"88 77 66 55 44 33 22 11" (hexadecimal)

but the result is

11 22 33 44 55 66 77 88 FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

it is should be

11 22 33 44 55 66 77 88 88 77 66 55 44 33 22 11
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF


problem is ...
it can not write second hex code
just only write first hex code

i use serial port , VB6 ,keil C

and my english is very bad...

so i want to tried everyway to find the solution

so plz help me thx...

[zmbd]

And you did not post the code that you are using... when you do so please make sure that you format it using the <CODE/> button.
Also understand, that this appears to be a homework problem... can you please provide some insite as to why you are doing this?

[Steaker]

that's not a homework...
it's our project

we use two 8051 chips and have to do read ,erase and write
i'm so sorry i forgot post my code

i want to ask how to send the code(hex)

now our problem is

11 22 33 44 55 66 FF FF FF FF FF FF
FF FF FF FF FF FF 88 88 77 66 55 44

why we can not ...put it on the correct address

when i sending a byte also have to send this byte address?

[Steaker]

out(1) = &H66 'start
out(2) = &H9  'length
out(3) = &H1  'CMD
out(4) = Val("&H" & Mid(codeline, 2, 2))  'addr
out(5) = Val("&H" & Mid(codeline, 4, 2))  'addr
out(6) = Val("&H" & Mid(b(x), 1, 2))
out(7) = Val("&H" & Mid(b(x), 3, 2))
out(8) = Val("&H" & Mid(b(x), 5, 2))
out(9) = Val("&H" & Mid(b(x), 7, 2))
out(10) = Val("&H" & Mid(b(x), 9, 2))
out(11) = Val("&H" & Mid(b(x), 11, 2))
out(12) = Val("&H" & Mid(b(x), 13, 2))
out(13) = Val("&H" & Mid(b(x), 15, 2))
out(14) = Not (out(6) Xor out(7) Xor out(8) Xor out(9) Xor out(10) Xor out(11) Xor out(12) Xor out(13))   'CRC
If (i = z + 1) Then
out(15) = &HAA
 
end if 
 
mscomm1.output=out

[Rabbit]

It's hard to diagnose because we don't know what codeline is or b(x).