1. An apparatus transfer of vertex information representative of graphics primitives between a host computer and processing device, comprising: a memory area to receive the vertex information from the host computer, the vertex information including, for each of the vertices of a primitive, vertex data and a vertex address corresponding to the vertex data, the vertex data representing parameters for each vertex, wherein the memory area includes a first and second buffer; address generation device responsive to the vertex address to generate a write address for the memory address; and a control circuit, responsive to the write address and to a select signal, to enable writes of selected vertex data to the first buffer and writes of remaining vertex data to the second buffer, wherein the control circuit also enables the processing device reads of the selected vertex data from the first buffer.