On 7/7/05, Tony Duell <ard at p850ug1.demon.co.uk> wrote: > Err, yes, but data transfer on the RXV21 always used DMA (NPR/NPG > signals). If the RXV21 never sees a non-processor grant, it'll never > transfer any data. Ah, yes... I was thinking about the Heathkit H27 interface. Different critical details. Mea culpa. -ethan