The Lahey language manual (early, around page 22 or so), under Input/Output, discusses Carriage Control. The plus sign ("+") in position one is used for printer and screen devices to suppress advance to new line before output. So, just issue the line again, with a "+" character in the first position after the first time it is displayed, to get it to printer over the previous one. Also, you should open the terminal device unit with CARRIAGECONTROL='FORTRAN' in the OPEN statement; see p. 184 of the manual, under OPEN. The manual says FORTRAN is the default for non-storage devices, so I suppose you could skip it in the OPEN. That option in OPEN is in blue text in the manual, so it appears to be a Lahey extension of the standard. I've used overprinting, and it seems to work.

I suspect this has been covered before, but I am not sure.

What I would like to do is to write an integer counter to the same spot on the screen repeatedly without moving the cursor:

Processing time step => X

Not

Processing time step => 3

Processing time step => 4

Processing time step => 5

and not

Processing time step => 3 Processing time step => 4 Processing time step => 5

Using ADVANCE=”NO” in the write statement merely makes the cursor go to the left, as in my second example – no carriage return, but I do get cursor motion. Is there a way to just print in the same spot?

Some versions of BASIC have a PRINT @(X,Y). I know we don’t have that…

Alvaro Fernandez

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