Dave P and Phoebus Dokos wrote: >> My question is regarding an overclocked QXL. Mine is currently at 33MHz >> but my 68040 is for 40 (therefore an 80 MHz crystal could be installed) >> but I do not know if the ram could take that! > >70ns FPM memory will support 50 or 60MHz bus speeds with ease. If it's >only running at 40MHz I would anticipate a large reduction in heat output >and current drawn.
70ns should be fine for 33MHz. The problem here is not really the RAM but the GLUE chip on the QXL - it's already 'cheating' even at 20MHz, and uses passes through it's logic array to generate delays for RAM timing. As bus speed increases, differences from one GLUE to the next and differences in operating temperature make the timings more and more crytical, 60ns RAM just gives added leeway for timing mismatches courtesy of the GLUE chip. N. _______________________________________________ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
