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authorChristian Krinitsin <mail@krinitsin.com>2025-06-30 12:24:58 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-06-30 12:27:06 +0000
commit33606b41d35115f887ea688b1a16f2ff85bf2fe4 (patch)
tree406b2c7b19a087ba437c68f3dbf0b589fa1d6150 /results/scraper/launchpad-without-comments/1239008
parentadedf8771bc4de3113041ca21bd4d0d1c0014b6a (diff)
downloadqemu-analysis-33606b41d35115f887ea688b1a16f2ff85bf2fe4.tar.gz
qemu-analysis-33606b41d35115f887ea688b1a16f2ff85bf2fe4.zip
add launchpad bug reports without comments
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+qemu fails to scroll screen on ^Vidmem output
+
+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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