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[Qemu-devel] [Bug 1239008] Re: qemu fails to scroll screen on ^Vidmem ou
From: |
Launchpad Bug Tracker |
Subject: |
[Qemu-devel] [Bug 1239008] Re: qemu fails to scroll screen on ^Vidmem output |
Date: |
Thu, 28 Dec 2017 04:17:30 -0000 |
[Expired for qemu (Ubuntu) because there has been no activity for 60
days.]
** Changed in: qemu (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1239008
Title:
qemu fails to scroll screen on ^Vidmem output
Status in QEMU:
Expired
Status in qemu package in Ubuntu:
Expired
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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