diff --git a/Study_LinuxCNC_Extra.md b/Study_LinuxCNC_Extra.md
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+++ b/Study_LinuxCNC_Extra.md
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+
+### [Headless LinuxCNC demo](https://www.youtube.com/embed/ib_G0eyn5FM)
+
+
+### [Weeny solder bot (LinuxCNC on A4 paper size)] (https://www.youtube.com/watch?v=rfSAW3zDQ7M)
+
+
+
+
+
+
+
+Remora is a free, opensource LinuxCNC component and Programmable Realtime Unit (PRU) firmware to allow LPC176x and STM32F4 micro-controller controller boards to be used in conjunction with a Raspberry Pi to implement a LinuxCNC based CNC controller. 
+```
+https://github.com/scottalford75/Remora
+```
diff --git a/Study_LinuxCNC_Sim.md b/Study_LinuxCNC_Sim.md
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+# Basic LinuxCNC simulation configuration
+
+
+## Axis
+
+
+
+### HAL for LinuxCNC
+
+linuxcnc-dev/lib/hallib/
+
+
+axis_manualtoolchange.hal
+core_servo.hal
+gantrysim.hal
+lathe.hal
+qtplasmac_comp.hal
+sim_lib.tcl
+simulated_home.hal
+util_lib.tcl
+xhc-hb04-layout2.cfg
+basic_sim.tcl
+core_sim9.hal
+halcheck.tcl
+locking_indexer.hal
+sim_rdelta.hal
+simulated_limits.hal
+var_show.tcl
+xhc-hb04.tcl
+check_config.tcl
+core_sim.hal
+hal_procs_lib.tcl
+moveoff_external.hal
+servo_sim.hal
+sim_spindle_encoder.hal
+simulated-xyyz-home.hal
+wheeljogpins.tcl
+check_xyz_constraints.hal
+core_stepper.hal
+hookup_moveoff.tcl
+plasmac.tcl
+sim_ldelta.hal
+simulated-gantry-home.hal
+tripodsim.hal
+xhc-hb04-layout1.cfg
+
+
+
+### sim for LinuxCNC
+
+linuxcnc-dev/configs/sim/axis
+
+
+
+
+
+
+
diff --git a/Study_spartan_6_fpga.md b/Study_spartan_6_fpga.md
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+# spartan-6-fpga
+## software_requirement:
+
+### 1st need to install Xilinx_software :
+
+### 
+
+
+lsusb
+
+Bus 001 Device 007: ID 2a19:1001 Numato Systems Pvt. Ltd Numato Lab Mimas Spartan6 FPGA Development Board
+
+
+
+
+
+
+
+Download 
+
+https://alpha.physics.uoi.gr/VHDL/Xilinx_software/ise_14.7/
+
+
+
+
+HELP:
+
+https://numato.com/docs/mimas-spartan-6-fpga-development-board/#components-tools-required-37
+https://gist.github.com/aliemo
+
+
+
+
+
+Study:
+
+https://www.verilog.com/
+https://www.verilog.com/v-books.html