From cdafa5da9eea69c8abda0d7bf82435e92e8cad7e Mon Sep 17 00:00:00 2001 From: Ben Harris Date: Sun, 22 Dec 2024 00:53:37 +0000 Subject: [PATCH] SN74S262/3 pinout The XM11 application note mentions "two chip enables", which can only be pins 14 and 15. --- NOTES | 10 ++++++++++ 1 file changed, 10 insertions(+) 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) -- 2.30.2