From: Ben Harris <bjh21@bjh21.me.uk>
Date: Sun, 22 Dec 2024 00:53:37 +0000 (+0000)
Subject: SN74S262/3 pinout
X-Git-Tag: bedstead-3.251~61
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~bjharris/git?a=commitdiff_plain;h=cdafa5da9eea69c8abda0d7bf82435e92e8cad7e;p=bedstead.git

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 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)