MEMORY_ON
writereg(dev, PP_BusCTL, ENABLE_IRQ | MEMORY_ON);
writereg(dev, PP_BusCTL, ENABLE_IRQ | MEMORY_ON);
writereg(dev, PP_BusCTL, MEMORY_ON);
(ENABLE_IRQ | (dev->mem_start ? MEMORY_ON : 0))); /* turn memory on */
writereg_io(dev, PP_BusCTL, MEMORY_ON);