diff --git a/src/hw.accel.a b/src/hw.accel.a
index d9ccb1d8d..b08537d1c 100755
--- a/src/hw.accel.a
+++ b/src/hw.accel.a
@@ -192,7 +192,7 @@ maccheck
          bne   build_setspeed ; always branches
 
 iic
-         lda   #$8D
+         lda   #$9D
          sta   fixiic
          ldx   romid_c
          cpx   #ROMID_CPLUS
@@ -383,8 +383,9 @@ FASTChip
          lda   #FC_LOCK
          sta   fc_lock
 
+         lda   gMachineInDHGRMode
 fixiic
-         bit   $C05D     ; fix colouring on IIc (SMC to STA on IIc)
-         plp             ; restore interrupt state
+         bit   $C05F     ; fix colouring on IIc (SMC to STA,X on IIc)
++        plp             ; restore interrupt state
          rts
 end_addon