Re: [Qemu-devel] [Bug 1239008] Re: qemu fails to scroll screen on ^Vidmem output

[rjasmin]

It is hosted on google code, a dying service. FreePascal(coffee) OS.A 
more basic version is posted there.I assume it works as the version that 
I last built did not for some reason. Sources should be there via 
subversion checkout.Thats what I tested with.
https://code.google.com/p/coffee-os/

  It uses a basic VRAM scroll buffer and writes to it.

Examples are found elsewhere in C. (OS Dev pages)
Im in the middle of a fedup upgrade at the moment, but will see what I 
can do.

On 06/17/2015 12:11 PM, Chris J Arges wrote:
> Can you test with the latest version to see if this still affects you?
> If this still is a problem, any information on how to obtain the Guest OS in 
> question that would also be helpful.
>
> ** Changed in: qemu (Ubuntu)
>         Status: New => Incomplete
>

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https://bugs.launchpad.net/bugs/1239008

Title:
  qemu fails to scroll screen on ^Vidmem output

Status in QEMU:
  New
Status in qemu package in Ubuntu:
  Incomplete

Bug description:
  Pascal uses ^Vidmem for B800 console output. The terminal does not
  oblige the Pascal OS code to scroll the output. Virtualbox emulation
  works, so this must be a qemu bug. Using QEMU in KVM mode as Ubuntu
  LTS.

  Source line to trip bug(in theory pushes VideoMem up one line):

  procedure Scroll;
  //this is whats causing crashes. FIXME:Virtualbox not affected.QEMU BUG?
  begin
    if scrolldisabled then exit;
        if (CursorPosY >= 24) then begin  //in case called before end of screen
      blank:= $20 or (TextAttr shl 8);
      Move((VidMem+(2*80))^,VidMem^,24*(2*80));
      // Empty last line
      FillWord((VidMem+(24*2*80))^,80,Blank);
      CursorPosX:=1;
      CursorPosY:=23;
      update_cursor;
    end;
  end;

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