Swindon Town were held while Bury moved away from the drop zone with a 3-1 victory at Shrewsbury.
The Robins could have joined Walsall on 76 points with a win, but could not find a way past Rochdale at Spotland.
Swindon remain in the automatic promotion places, although they are only two points clear of fourth placed Milton Keynes Dons.
Elsewhere, Bury secured an important 3-1 away win at Shrewsbury, a result that moves them six points clear of Boston.
Andy Bishop (pictured) opened the scoring very early on, but Derek Asamoah's strike three minutes into first-half injury time brought the home side level.
The Shakers were not to be denied and Bishop's second followed by Glynn Hurst's goal ensured the visitors claimed all three points.