diff --git a/targets/mega65/vic4.c b/targets/mega65/vic4.c
index 154b79c4..b8d73980 100644
--- a/targets/mega65/vic4.c
+++ b/targets/mega65/vic4.c
@@ -378,7 +378,11 @@ static void vic4_interpret_legacy_mode_registers ( void )
 	vic4_update_vertical_borders();
 
 	Uint8 width = REG_H640 ? 80 : 40;
-	REG_CHRCOUNT = width;
+
+	// Set all 10 bits of ChrCount
+	vic_registers[0x5e] = width;
+	vic_registers[0x63] &= 0xCF; // clearing bits 4 and 5, being MSB of CHRCOUNT
+
 	SET_LINESTEP_BYTES(width);	// * (REG_16BITCHARSET ? 2 : 1));
 
 	REG_SCRNPTR_B0 = 0;
diff --git a/targets/mega65/vic4.h b/targets/mega65/vic4.h
index 95e5c098..92221b12 100644
--- a/targets/mega65/vic4.h
+++ b/targets/mega65/vic4.h
@@ -110,7 +110,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 #define REG_LINESTEP			vic_registers[0x58]
 #define REG_LINESTEP_U8			vic_registers[0x59]
 #define REG_CHARXSCALE			vic_registers[0x5A]
-#define REG_CHRCOUNT			vic_registers[0x5E]
+#define REG_CHRCOUNT			(vic_registers[0x5E] + ((vic_registers[0x63] & 0x30) << 4))
 #define REG_SCRNPTR_B0			vic_registers[0x60]
 #define REG_SCRNPTR_B1			vic_registers[0x61]
 #define REG_SCRNPTR_B2			vic_registers[0x62]