diff --git a/src/sudoku.s b/src/sudoku.s
index 797d371..1724634 100644
--- a/src/sudoku.s
+++ b/src/sudoku.s
@@ -134,11 +134,12 @@ PFIEEX: POP   P,Y                      ;Restore the Y register.
 
 ;Subroutine that reads the contents of the file into the buffer at FIELD
 IMPRTF: PUSH  P,A                      ;Save the A register.
+        PUSH  P,B                      ;Save the B register.
         PUSH  P,X                      ;Save the index register.
         MOVE  X,[440400,,FIELD]        ;Init a 4-bit byte pointer to FIELD.
         .CALL [SETZ ? SIXBIT/OPEN/     ;Open a file descriptor.
             [.UAI,,CHDSKI] ? [SIXBIT/DSK/] ;Mode, channel and device name
-                [SIXBIT /PUZZL1/] ? [SIXBIT /SUDOKU/] ? 400000,,[SIXBIT/JALI/]]
+                [%CLIN,,A] ? [%CLIN,,B] ? ((SETZ))]
          .LOSE %LSFIL                  ;Handle errors after opening the file
 IMPRD:  .IOT  CHDSKI,A                 ;Read an ascii char into A.
         JUMPL A,IMPREX                 ;If there was nothing read, exit.
@@ -153,6 +154,7 @@ IMPREX: .CALL [SETZ ? SIXBIT/CLOSE/    ;Close the file, before returning.
                 [,,CHDSKI] ((SETZ))]
          .LOSE %LSFIL
         POP   P,X                      ;Restore the X register.
+        POP   P,B                      ;Restore the B register
         POP   P,A                      ;Restore the A register.
         POPJ  P,                       ;Return from the input subroutine,
 DONE:   .LOGOUT  2,                    ;Exit point for the program.