you mean like this?
https://bitcointalk.org/index.php?board=1.0;sort=first_post;asc

just add a ";sort=first_post;desc" (or ;asc) after board=x.x.

By default, SMF sorts threads in boards by the date & time of the last post made.  This modification allows the administrator to set up new possibilities for sort methods, on a board by board basis:

- Last post - default
- Started by
- Replies
- Views
- First post
- Subject

Each can also be sorted in ascending or descending order.

These settings by the administrator are default only.  Users can change them on a time-by-time basis.