On 04/15/2012 07:09 PM, Kirk Wallace wrote: > I have some scope traces from LinuxCNC's pump below. I haven't had time > to add text to the pictures yet but I'll try to describe them in this > message for now. The group of pictures is here: > http://wallacecompany.com/machine_shop/G540/ > > ------------ > Motherboard port, set to SPP in BIOS: > http://wallacecompany.com/machine_shop/G540/g540_mb_spp.jpg > > one trace is at 0 V, vertical divisions are 1 V per div., green LED OFF > > ------------ > Motherboard port, set to EPP in BIOS: > http://wallacecompany.com/machine_shop/G540/g540_mb_epp.jpg > > green LED ON > > ------------ > Rosewill PCI card, set to SPP and EPP, I get the same trace either way: > http://wallacecompany.com/machine_shop/G540/g540_rw_sepp.jpg > > green LED OFF > > ------------ > Rosewill PCI card, with 1k Ohm pull-up: > http://wallacecompany.com/machine_shop/G540/g540_rw_1kpup.jpg > > green LED ON > > ------------ > Startech PCI card, set to SPP: > http://wallacecompany.com/machine_shop/G540/g540_st_spp.jpg > > green LED OFF > > ------------ > Startech PCI card, set to EPP: > http://wallacecompany.com/machine_shop/G540/g540_st_epp.jpg > > swings all the way to 5 V, green LED ON > > ------------ > SIIG PCI card, set to SPP and EPP, I get the same trace either way: > http://wallacecompany.com/machine_shop/G540/g540_siig_spp.jpg > > just enough to turn green LED ON > > ------------ > SIIG PCI card, with 330 Ohm pull-up, set to SPP and EPP, I get the same > trace either way: > http://wallacecompany.com/machine_shop/G540/g540_siig_k33pup.jpg > > green LED ON > > ------------ > > Horizontal divisions are 50 microseconds/div. One cycle is 4 div. or > 20kHZ (?) (base-thread = 100000ns, with reset = 1000). > > Kirk,
Is your probe matched to your scope? It looks horribly under-compensated in those pics. Mark ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
