For sale : Subway clockport USB

[platon42]

@AmigaClassicRule

As long as you understand that USB wastes (notice I said "wastes" not "uses") horrendously huge amounts of cpu power to transfer data.  It will completely drag down your cpu.

USB even drains your CPU power while the device is doing nothing.

Merely having any USB device connected is enough to start continuously draining your cpu power.

This is only the case with the Highway/Subway controller chips -- and only for keyboards/mice or other devices that need interrupt transfers. With the Algor and Deneb cards, there's no such drawback -- the more sophisticated controller chips take care of the protocol overhead with no host side interaction.

[platon42]

It's still performance wasted on luxury.
I dare say you can't play games like Quake or Duke 3D from USB, since the USB protocols produce too much overhead.

You can repeat that as much as you like, but it doesn't turn make it any more real. Transferring via Mass Storage Device uses an "overhead" of a 31 byte command packet and a 13 byte status packet PER COMMAND. I.e. if you read 4 MB of data, you have to handle two extra packets out of 8192 bulk data packets. In my calculation that's a protocol overhead of 0,024%.

My Deneb did 8.5 MB/sec reading from MSD devices. That's almost as fast as the internal A4000T SCSI controller. You know what? Most of the time is spent on the data transfer and not on the protocol overhead. Raw bus speed.

Using a Deneb with an USB Ethernet dongle will get you the fastest Ethernet solution available for the Amiga (somebody posted a result of 1.8 MB/sec recently with Roadshow). You will get the cheapest sound card solution with USB Audio.

Oh whatever...