Peter C. Wallace wrote: > On Fri, 9 Nov 2007, Jon Elson wrote: > > >>Date: Fri, 09 Nov 2007 20:36:30 -0600 >>From: Jon Elson <[EMAIL PROTECTED]> >>Reply-To: "Enhanced Machine Controller (EMC)" >> <emc-users@lists.sourceforge.net> >>To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> >>Subject: Re: [Emc-users] Low Cost Motion Contorl Card? >> >>Peter C. Wallace wrote: >> >>> >>>Besides I dont think parallel port cards are going away any time soon, I just >>>saw a just released PCI-express - Serial/parallel/localbus chip... >> >>How much was that PCI-E card? I may have to get a system with >>PCI-E and use a parallel card in it to explore the implications >>of serializing the communications. >> >>Thanks for the news flash! >> >>Jon > > > > This was just the chip (MOSCHIP MCS9901), but cards should not be too far > behind. I was interested as it can also be used as a cheap PCI-E to 8 bit > local bus (ISA) bridge and the serial ports go up to 16 MBaud... Hmmmm, 16 MBits/sec? Gee, I could send a 16-byte packet, with start and stop bits, in 10 us! And, UARTs are full-duplex. I was thinking "what a pity it doesn't have SYN recognition", but it is ASYNC, so it doesn't need them. Most likely has 16450-style FIFOs, too, and 16 bytes, I'll bet. So, you can collect all 16 bytes of the packet in one burst. Definitely an interesting alternative, but the parallel port OUGHT to work right out of the box with no software changes (I hope).
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