smc

For convenience's sake, we can transform $A$ to the origin and $B$ to $(99,999)$ (this does not change the problem). The line $AB$ has the equation $y=\frac{999}{99}x=\frac{111}{11}x$. The coordinates are integers if $11|x$, so the values of $x$ are $11,22\dots 88$, with a total of $8⟹\boxed{8}$ coordinates.