R. D. Davis <rdd(a)rddavis.org> wrote: Try reading the IP and SA registers with EXAMINE commands: If instead of numbers (values read), the console responds with a message to the effect that no device responded to the read, it means that there is something wrong with the TQK70 board. It has nothing to do with the power to the drive since the controller must respond to reads of its IP and SA registers even if there is no drive at all. Grant continuity problems also won't affect the ability to read or write registers, since the device can still act as a slave, it needs a grant only to do DMA or send an interrupt vector to the CPU. MS