diff --git a/NOTES b/NOTES
index f573325..53895ec 100644
--- a/NOTES
+++ b/NOTES
@@ -290,3 +290,13 @@ Swedish Z80-based computer, so there is a purported ROM of it
 available for emulators.
 
 Also some real screenshots; e.g. https://www.youtube.com/watch?v=Jy6tQsyd4ho
+
+I haven't found a datasheet for the SN74S262/3, but the schematic in the
+ABC80 service manual provides a pinout:
+
+4-7: row address 0-3
+8,9,11-13: data 0-4
+16-19,1-3: character address 0-6
+20: Vcc
+10: Gnd
+14,15: "two chip enables" (Gnd on ABC80)