[PATCH 0/1] MR4953: krnl386: Emulate the VGA status register.

[Alex Henrie (＠alexhenrie)]

Sega Bug uses it as a timer.

[PATCH 1/1] krnl386: Emulate the VGA status register.

[Alex Henrie]

From: Alex Henrie

Sega Bug uses it as a timer.
---
 dlls/krnl386.exe16/ioports.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dlls/krnl386.exe16/ioports.c b/dlls/krnl386.exe16/ioports.c
index 7f795c2badf..dc188fabecf 100644
--- a/dlls/krnl386.exe16/ioports.c
+++ b/dlls/krnl386.exe16/ioports.c
@@ -316,6 +316,9 @@ DWORD DOSVM_inport( int port, int size )
     case 0x201:
         res = ~0U; /* no joystick */
         break;
+    case 0x3da:
+        res = GetTickCount() % 17 == 0 ? 0x4 : 0; /* report vblank about 60 times per second */
+        break;
     default:
         WARN("Direct I/O read attempted from port %x\n", port);
         break;