diff --git a/doc/notes.txt b/doc/notes.txt
index 310901cf..b6d71339 100644
--- a/doc/notes.txt
+++ b/doc/notes.txt
@@ -130,6 +130,7 @@ TODO:
   - support NES_HEADER_16K?
   - PPU/TIA register write visualization
   - NES crt should mark raster pos when debugging
+  - OAMDMA in profiler? (haltCycles)
 - JSNES
   - doesn't support hiding >8 sprites
   - doesn't do sprite zero test right
diff --git a/index.html b/index.html
index e4649834..20994e56 100644
--- a/index.html
+++ b/index.html
@@ -211,7 +211,7 @@ if (window.location.host.endsWith('8bitworkshop.com')) {
         </a>
       </li>
       <li>
-        <a class="dropdown-item dropdown-link" target="_book_nes" href="https://www.amazon.com/gp/product/1541021304/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag=pzp-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B01N4DSRIZ&linkId=04d39e274c06e6c93b93d20a9a977111">
+        <a class="dropdown-item dropdown-link" target="_book_nes" href="https://www.amazon.com/gp/product/B07VVJ15JJ/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B07VVJ15JJ&linkCode=as2&tag=pzp-20&linkId=3f90f81256757d641ed2d77adbaa9586">
           <img src="images/book_nes.png"/>
           &nbsp;&nbsp;<span class="book-title">Making Games For The NES</span>
         </a>
diff --git a/presets/verilog/chardisplay.v b/presets/verilog/chardisplay.v
index b732eba7..133bc07c 100644
--- a/presets/verilog/chardisplay.v
+++ b/presets/verilog/chardisplay.v
@@ -72,7 +72,7 @@ module test_ram1_top(clk, reset, hsync, vsync, rgb);
         // increment RAM cell
         ram_write <= (ram_read + 1);
         // only enable write on last scanline of cell
-        ram_writeenable <= (vpos[2:0] == 7);
+        ram_writeenable <= display_on && rom_yofs == 7;
       end
       // on 8th pixel of cell
       7: begin