2012/11/5 Viesturs Lācis <viesturs.la...@gmail.com> > 2012/11/5 andy pugh <bodge...@gmail.com>: > > On 5 November 2012 19:10, Sven Wesley <svenne.d...@gmail.com> wrote: > > > >> @Andy, why is it difficult and why is it the wrong problem? I clearly > >> measure a performance boost running the controller PC headless. > >> Would it be easier and cheaper to order a Mesa board? No. > > > > It won't be cheaper _and_ easier, but it could well be easier and more > > expensive. > > Are You serious?!? How is a setup of 2 PCs - one for LinuxCNC with > software step generation and other of graphical frontend - more easy > than simply adding an FPGA card either to LPT port or in PCI slot? And > how is it easier to configure such a double-PC system than take a > sample config in LinuxCNC and adjust some lines to fit particular > machine? > And where do You get whole PC (MB + RAM + HDD + PSU) for less than 100 > EUR (based on 5i25 price, provided by Andy)? > > IMHO any attempts to combine 2 PCs, when adding an FPGA card is not > even considered, certainly is way more difficult way to solve wrong > problem. It not only adds a whole layer of complexity to overall > system, it also does not introduce any additional functionality. Using > FPGA card adds new features (way more I/O bits, pwmgens, stepgens and > encoder modules can handle much higher pulse frequencies etc.) and > IMHO does not make the system significantly more complex. > Generally using FPGA card certainly is easier _and_ cheaper. Try it > for Yourself :) > > Wow, sensitive subject. Are _you_ serious? I didn't even have to buy another PC to run a dual PC setup, it's all in the workshop already. All it takes is ONE freakin' command line and it's running. I bought the to-me-pretty-useless ITX computer for €150. I get fully functional laptops for free that works better than the ITX board, a Raspberry costs less than €50 with a card and casing and shipping. I don't NEED extra I/O's for an already running machine. I have also already stated that latency dropped with 50 % on the existing controller when it was running headless. And on top of that I have given the Mesa credits already. Did you even read the rest of the discussion before you jumped the train? I think not.
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