Info about Z80 machine

Perhaps, but the reason you can't run at 56K is then not the fault of the VoI call, but rather because you can't run 56K between two CPE devices at all. And I don't think 56K is done with the assistance of the local CO; I think it's done by running a T1 (or moral equivalent) into a modem-bank device at the ISP. Certainly that's what the ISP I work at did back when they still ran a modem bank, though I don't recall whether that particular bank did 56K. After all, once the end-user's CO digitizes the signal, you can ship it halfway around the world and the only effect will be increased RTT. (Telco circuits do not just drop little chunks of data the way the Internet does; they're circuit-switched rather than packet-switched, after all.) /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML mouse at rodents-montreal.org / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B