That was my point. So what's happened is that the industry, in their infinite wisdom has opted to replace several interfaces that worked very well with one that doesn't work very well for many things.

As a consequence, we have no reliable serial ports, no reliable parallel ports, and quite dodgy "other things" that cause problems.

Printers via USB aren't reliable, nor are they particularly useable outside the PC environment, though keyboards and mice interfaced with USB haven't messed me up yet in the PC environment. The widespread use of USB has allowed printer manufacturers to steal bandwidth from the PC in order to reduce their cost. Unfortunately, the result is that you nearly can't buy a printer to use with your MCU. What was the last serially or parallel interfaced printer that you could buy for use with a simple MCU? What did it cost? Those $90 PC printers won't work with your 805x, and, unless you spend quite a little time, effort, and money, you won't be able to use one with the typical MCU of any flavor. You're stuck with a USB-host-capable MCU and a HUGE task of coding for that printer. Try it sometime.


And that was my other point. That 2-second, and sometimes 2-minute timeout that the PC imposes on your traffic requires a very, Very large FIFO. Where would you get such a FIFO? Methinks you'd have to build it yourself. Now ... Where will you get a USART of any sort these days? It's hard enough getting a UART. Philips used to build a nice 24-pin UART with a built-in baud rate generator. They don't offer it any longer. The ones in the old PC's aren't adequate to the task, but even if they were, how would you hook one up to today's USB-interfaced serial adapters, most of which don't even work with the ISP software from various '52 makers.


... and how do you do that with a USB-provisioned notebook?


True, in that you've stated the problem. There's no solution, though.



I believe I've already explained why that isn't true ...

RE