Begenier don't know how to start

Edit 1 : change title

I'm new to LinuxCNC and to this forum.

I have build a CNC console for a DIY routeur 800x800x300 (see this topic ).

I have installed LinuxCNC 2.7.14 from live CD.
the PC is based on an ASRock J3355B-ITX board with 4GB RAM, 120GB SSD drive.
with this configuration the latency was to big (near 1000000ns). I add a Sapphire Radeon HD6450 graphic card in order to reduce the Jitter. Now latency test give me this result :

With this value I set the Jitter the maximum in StepConf Wizard to this :
1
After, I run one axis test :


The result was very bad :

This image show pulse signal. The frequency give me an expected result with 400mHz where I hope to get 2kHz.

I'm a beginner in Linux and I don't know to proceed. Can you guide me through to solve this issue ?

Thanks for answer,

The screw pitch is good.
I have set the microstepping according to the driver (lead shine MA860H) setting.
I have wired the driver and the motors ans the speeds don't seems realistic. With a 2.5mss step period the motors move very slowly.

I don't understand why when I change the Step area this has an effect on stepper speed.

I have made some adjustment in the stepconf. I getting a better speed but it depends on the test area.
Some exemples :

Area	Pluse Freq.
0,01mm	250Hz
0,1mm	63Hz
1,00mm	26Hz

I'm on the way. Pinout is wrong.

I try to get the good Parport config with the good pinout in Stepconf.

Find the solution.

It is not a computer or OS problem but a user mistake. I have wired the break board form 2 to 9 & 14 and I entered 1 to 9 in Stepconf (See image)


Correcting Stepconf pinout and parameter with tommylight value. It's works !

Machine is not build yet, so I can't check direction. I just can see motors running


Thanks for your help