  We study a restricted-height version of the one-dimensional Oslo sandpile
with conserved density, using periodic boundary conditions. Each site has a
limiting height which can be either two or three. When a site reaches its
limiting height it becomes active and may topple, loosing two particles, which
move randomly to nearest-neighbor sites. After a site topples it is randomly
assigned a new limiting height. We study the model using mean-field theory and
Monte Carlo simulation, focusing on the quasi-stationary state, in which the
number of active sites fluctuates about a stationary value. Using finite-size
scaling analysis, we determine the critical particle density and associated
critical exponents.
