dio_open():

[cc65] / doc / apple2.sgml

diff --git a/doc/apple2.sgml b/doc/apple2.sgml
index 6af74b3a5f628a0612704c716d5a2e8301175aa8..7b4bd722615936058e780a18b4fc9e2474927b53 100644 (file)
--- a/doc/apple2.sgml
+++ b/doc/apple2.sgml
@@ -498,15 +498,10 @@ The function <htmlurl url="dio-1.html" name="dio_open()"> has the single paramet
 slot and drive pair is mapped to that <tt/drive_id/ according to the formula
 
 <verb>
-    drive_id = (slot * 2) + (drive - 1)
+    drive_id = slot * 16 + (drive - 1) * 128
 </verb>
 
-so that for example slot 6 drive 1 is mapped to <tt/drive_id/ 12.
-
-The function <htmlurl url="dio-1.html" name="dio_open()"> succeeds only if a
-formatted disk is present in the drive. However intentionally no check is
-performed on the presence of a ProDOS 8 disk. Therefore access to all standard
-16-sector disks (as for instance DOS 3.3) is possible.
+so that for example slot 6 drive 2 is mapped to <tt/drive_id/ 224.