diff --git a/notes/color-video.md b/notes/color-video.md
index a119901..987ff59 100644
--- a/notes/color-video.md
+++ b/notes/color-video.md
@@ -1,5 +1,5 @@
 # Color Video
 - 307 200/0x4 B000 Bytes needed
-- 9\*32K RAM chips (AS7C256C-15PCN)
+- 10\*32K RAM chips (AS7C256C-15PCN)
 - consider: memory needs to be duplicate
 - TR9C1710
diff --git a/notes/memory-layout.md b/notes/memory-layout.md
index 5b259b4..1792428 100644
--- a/notes/memory-layout.md
+++ b/notes/memory-layout.md
@@ -23,8 +23,8 @@
 | 0x0000 | 0x4AFF | VRAM             |
 | 0x6000 | 0x7FFF | character memory |
 
-# Color Video
-| start  | end    | use              |
-| :----- | :----- | :--------------- |
-| 0x0000 | 0x4AFF | VRAM             |
-| 0x6000 | 0x7FFF | character memory |
+# Color Video (0x10-0x19)
+| start  | end    | use  | bank      |
+| :----- | :----- | :--- | :-------- |
+| 0x0000 | 0x7FFF | VRAM | 0x10-0x18 |
+| 0x0000 | 0x3FFF | VRAM | 0x19      |