From b783dc268f28db48a7d9d0bf332b9ceaf490b036 Mon Sep 17 00:00:00 2001
From: Bjorn Einar Bjarntes <bjartnes@gmail.com>
Date: Sun, 19 Dec 2021 19:58:35 +0100
Subject: [PATCH] commented the rewrite a bit

---
 src/main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/main.c b/src/main.c
index 67c609a..52ccab9 100644
--- a/src/main.c
+++ b/src/main.c
@@ -31,6 +31,10 @@ void setAndClearHiRes(){
 }
 
 void calcAdress(){
+    /// Refactored it a bit, it had stuff like 320*FLOOR(Y/8) which is made into
+    /// 40*8*FLOOR(Y/8) which is the same as (32+8)* (Y and remove last three bits)
+    /// which ends up being (4+1)*Y_with_three bits removed
+    /// which is split into a temp variable... and summed in the last line
     tmpY = (y & 0xf8) << 3;
     ad = 0x2000+tmpY + (tmpY << 2) + (y & 7)+ (x&(0xfff8));
 }