This is the results so far...

(sorry it's not much) lol

0,0 = newline
109 = PRINT "xxxxx"
100 = PRINT number
147 = PRINT

The number of rows is represented by two bytes, and two bytes also represent the number of bytes, but I couldn't find a fixed address in which these two bytes are, and I couldn't find any pointer to it, however the address of the number of rows can be found by going from the end 6 bytes.

...9,0,8,0,255*8,rows(byte 1),rows(byte 2),2,1,0,0 (end of program)

Except for the rows this string of bytes is always the same.

I'll investigate further when I get back from my vacation in two weeks.