diff --git a/sim/definitions.ts b/sim/definitions.ts
index 3521bf2c..ca29a2b9 100644
--- a/sim/definitions.ts
+++ b/sim/definitions.ts
@@ -41,6 +41,12 @@ namespace pxsim {
         gpioPinsNeeded: number | number[],
     }
     export interface PartVisualDefinition {
+        image: string,
+        width: number,
+        height: number,
+        left: number,
+        top: number,
+        pinDist: number,
     }
     export interface PartDefinition {
         visual: string | PartVisualDefinition,
diff --git a/sim/visuals/boardhost.ts b/sim/visuals/boardhost.ts
index 90cff24a..9a44d849 100644
--- a/sim/visuals/boardhost.ts
+++ b/sim/visuals/boardhost.ts
@@ -159,6 +159,8 @@ namespace pxsim.visuals {
                 cmp.updateTheme();
                 cmp.updateState();
             } else {
+                let vis = cmpDesc.visual as PartVisualDefinition;
+                console.log("TODO PART: " + vis.image);
                 //TODO: support generic parts
             }
             return cmp;