EPM3128 5v output

I have an EPM3064A design that I have in Quartus 13.0sp1 done in verilog, and causing outputs to be detected and used in open collector mode is easy. Here is a snippet of my code where the RED ... GRN LED drivers are detected and setup as open collector.

No other special setup in the .qsf files required, other than assignment to the appropriate pin number and the I/O type to "3.3-V LVTTL".

    assign IO_RED = RED ? 1'b0 : 1'bz;
    assign IO_YEL = YEL ? 1'b0 : 1'bz;
    assign IO_GRN = GRN ? 1'b0 : 1'bz;