i've never use those display but... can you try the following code and let us know ???

Code:
TRISB=0 ' set PORTB as output
TRISA=0 ' Set PORTA as output

DataPORT      var PORTB
CS            var PORTA.0
WR            var PORTA.1

CharacterLoop VAR BYTE

cs=1 ' disable 
wr=1 ' disable 
pause 50

Start:

      For characterloop=0 to 127
          dataport = characterloop
          pause 10
          cs=0 ' enable chip
          pause 10 ' wait to stabilize display data
          WR = 0 ' send data to display
          pause 10 '
          wr = 1
          pause 10
          cs = 1
          pause 1000
      next
      goto start