try to fix IIc colouring

src/hw.accel.a

@@ -192,6 +192,8 @@ maccheck
          bne   build_setspeed ; always branches
 
 iic
+         lda   #$8D
+         sta   fixiic
          ldx   romid_c
          cpx   #ROMID_CPLUS
          bne   build_addon ; not a //c+, eventually hit Zip
@@ -381,6 +383,8 @@ FASTChip
          lda   #FC_LOCK
          sta   fc_lock
 
+fixiic
+         bit   $C05D     ; fix colouring on IIc (SMC to STA on IIc)
          plp             ; restore interrupt state
          rts
 end_addon