SN74S262/3 pinout

The XM11 application note mentions "two chip enables", which can only
be pins 14 and 15.

diff --git a/NOTES b/NOTES
index f573325f92bf463cc6412c84eda5c961ce292e81..53895ecbd741827f12fcfc990825df96812abbf2 100644 (file)
--- 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)