p16 screen design notes added to design.txt

diff --git a/design.txt b/design.txt
index a8c4c05..efb3250 100755 (executable)
--- a/design.txt
+++ b/design.txt
@@ -72,3 +72,14 @@ be used to turn off stack checking, so no stack checking routines get called.
 [15:07]        joncampbell123m the simplest way is to compute a rectangle that covers them all\r
 [15:07]        joncampbell123m then redraw that.\r
 [15:08]        joncampbell123m Then optimize the code from there how you handle it\r
+\r
+\r
+\r
+\r
+screen set up 2 rendering screens lock together\r
+1 scrolls the other one follow\r
+\r
+pointers from 2nd screen follows the 1st\r
+size and dimentions and stuff are the same but addresses are different\r
+data is different \r
+\r