Fix Picmatic (100Hz TV only) light gun positioning in lores or shres resolutions.

diff --git a/arcadia.cpp b/arcadia.cpp
index 99cf357405a3e04701e86cd1ce2ab70286d4e715..299d4729d19aebb5f05ae778376a5d9200b84dc7 100644 (file)
--- a/arcadia.cpp
+++ b/arcadia.cpp
@@ -656,8 +656,10 @@ static uae_u32 REGPARAM2 alg_bget (uaecptr addr)
                        // Picmatic 100Hz games
                        int reg = (addr >> 12) & 15;
                        uae_u8 v = 0;
-                       uae_u16 x = lightpen_x[1 - picmatic_ply];
-                       uae_u16 y = lightpen_y[1 - picmatic_ply] >> currprefs.gfx_vresolution;
+                       uae_s16 x = lightpen_x[1 - picmatic_ply];
+                       x <<= 1;
+                       x >>= currprefs.gfx_resolution;
+                       uae_s16 y = lightpen_y[1 - picmatic_ply] >> currprefs.gfx_vresolution;
                        if (reg == 3) {
                                v = 0xff;
                                // left trigger