From 44ebbb0b29bb219e5af2c1bf23b2e2324175ad6d Mon Sep 17 00:00:00 2001
From: sanamon <2462603+sanamon@users.noreply.github.com>
Date: Mon, 13 Nov 2023 07:44:31 +0100
Subject: [PATCH] Update README.md

Added link to iowahills files
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 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index e873684..bb96a6c 100644
--- a/README.md
+++ b/README.md
@@ -135,7 +135,7 @@ The PCB files have been made with Eagle 5.11, and can be modified or otherwise r
 
 # Background
 The folder **$PICO/docs** also contains some manuals, of which the *C-SDK description*, the *RP2040 datasheet* and the *Pico Pinout* are absolute must-reads when you start writing software. Note that this folder is only created by the **ndabas** script, after manual installation you should find these on the Raspberry website.  
-For calculating filters I have used the free software from [Iowa Hills](http://www.iowahills.com/8DownloadPage.html) (website has been down for a while)  
+For calculating filters I have used the free software from [Iowa Hills](http://www.iowahills.com/8DownloadPage.html) (website has been down for a while, but files can be found using [Wayback Machine]( https://web.archive.org/web/20210819042054/http://www.iowahills.com/8DownloadPage.html) )  
 I also used the online FIR filter calculator [T-Filter](http://t-filter.engineerjs.com/) 
 
 # Copyright notice