A card doesn't fix much. Basic problem is you're timing EACH step, which can be over 6KHz. A single step being significantly out of place can create a stall. The main source of jitter is in the CPU and chipset, not the parallel port.
The Mesa stuff, I believe mine is a 1ms period, and it's actually an overall plan, the FPGA will carry out the timing plan smoothly even if the packet is early or late, making it mostly insensitive to jitter problems. Danny On 1/27/2017 6:18 PM, andy pugh wrote: > On 27 January 2017 at 23:56, Gregg Eshelman <[email protected]> wrote: >> If a PCs built in ports are too iffy to use with LCNC or other CNC software, >> will a PCI port card work? > Given the price of a 5i25 / 6i25, why bother with an actual parallel > port cards? They can drive P-port breakout boards just like a p-port, > but can work with much higher latency and can also step in the MHz > frequency range. > > The difference in price is a handful of broken milling cutters. > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
