Modula II on IBM PC with HALO graphics

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2 total messages Started by John B. Nagle Tue, 08 Dec 1987 06:50

#3981

Author: John B. Nagle
Date: Tue, 08 Dec 1987 06:50

20 lines
1260 bytes

      Has anyone tried Logitec's Modula II with HALO graphics on a PC?
The HALO literature claims that it will work.  Does it?

      I would like to map a rectangular array of values into a range
of shades of a color, so that I can display map data (obtained from
a ranging sonar) as a range of colors from red to green.  Can this be
done using HALO under Modula II on a PGA or EGA type display?

      Some questions on Logitec Modula II:

      1.  Are subranges assigned space appropriately?  In particular,
	  does 0..255 occupy only one byte?  

      2.  How well does concurrency work, if at all?  Is it possible
	  to concurrently operate async ports while updating the
	  screen?


					John Nagle

Re: Modula II on IBM PC with HALO graphics

#3989

Author: Erik Jacobsen
Date: Sat, 12 Dec 1987 13:13

10 lines
904 bytes

jbn@glacier.STANFORD.EDU (John B. Nagle) asks in <17237@glacier.STANFORD.EDU>
> Some questions on Logitec Modula II:
> 
> 1.  Are subranges assigned space appropriately?  In particular,
> does 0..255 occupy only one byte?  

No, subranges occupy the same amount of space as the type they are
a subrange of. E.g. 0..255 will occupy two bytes. You may use a
CHAR or a BYTE, and convert to and from CARDINAL everytime you need
to do some caluculations.

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