Atari 5200 OS header refinements

2020-12-23 23:35:09 +01:00
parent 1c72da4904
commit 2e9bada1f2
2 changed files with 19 additions and 9 deletions
--- a/doc/atari5200.sgml
+++ b/doc/atari5200.sgml
@@ -73,7 +73,17 @@ Special locations:

 Programs containing Atari 5200 specific code may use the <tt/atari5200.h/ header file.

+This also includes access to operating system locations (e.g. hardware shadow registers) by a structure called
+"<tt/OS/".
+The names are the usual ones you can find in system reference manuals. Example:

+<tscreen><verb>
+...
+    OS.sdmctl = 0x00;                       // screen off
+    OS.color4 = 14;                         // white frame
+... tics = OS.rtclok[1]                     // get ticks
+</verb></tscreen>
+ 
 <sect1>Atari 5200 specific functions<p>

 <itemize>