Added README2

README2

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+This is the README file for perlblast.
+
+'perlblast' is a Perl-Tk implementation of 'galblast' (by Manfred Winterhoff) and 
+'atfblast' (http://www.bhabbott.net.nz/atfblast.html). 
+
+The main drive for 'perlblast' is that it does run on Linux. I tried 'galblast' under Windows XP in
+a virtual machine but always the parallel port access was troublesome, Some other programs to access the parallel
+port from a virtual machine worked very well....
+
+I learned and tested also the use via an usb<->parallel dongle, that turned out to function very well too :-)
+
+As the code is now it interfaces to the simplified hardware GAL/ATF Blaster v2.1 as found on 
+http://www.bhabbott.net.nz/atfblast.html
+
+I am working on another hardware project for GAL/ATF programming that can handle various VPP and VCC settings.
+In that design I took some more measures to block any dangerous voltage from the GAL back to the parport. 
+If anything goes wrong here, you may fry your motherboard in an instant. (I did so by doing something VERY stupid).
+
+When ready, the design will come available on GitHub as I did for this software.
+
+I believe I prefer the use of an USB<->LPT dongle and that is very well possible. On Linux you need to blacklist
+the modules 'usblp' and load 'uss720'. Initially the uss720 module did not recognize my usb dongle. It turned out
+that the table in uss720.c did not hold the usb-ID for my dongle. 
+
+lsusb -v gave me: Bus 001 Device 019: ID 0711:0302 Magic Control Technology Corp. Parallel Port
+
+After editing drivers/usb/misc/uss720.c in my Linxu source tree and adding the values to the table near to the end
+of the uss720.c file.
+
+/* table of cables that work through this driver */
+static const struct usb_device_id uss720_table[] = {
+        { USB_DEVICE(0x047e, 0x1001) },
+        { USB_DEVICE(0x0557, 0x2001) },
+        { USB_DEVICE(0x0729, 0x1284) },
+        { USB_DEVICE(0x1293, 0x0002) },
+        { USB_DEVICE(0x050d, 0x0002) },
+        { USB_DEVICE(0x0711, 0x0302) },                 /* lucent chip */   <<<  I added this one 
+        { }                                             /* Terminating entry */
+};
+
+Now after: make modules and make modules_install, rmmod uss720 and modprobe uss720, and re-inserting
+te usb<->lpt dongle, it worked. I found that after use, the reference count stays at '1', so rmmod would not remove
+the uss720 module. I don't know why that is at this moment.
+
+From dmesg:
+usb 1-12.3: new full-speed USB device number 19 using xhci_hcd
+usb 1-12.3: New USB device found, idVendor=0711, idProduct=0302
+usb 1-12.3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
+parport1: fix this legacy no-device port driver!
+lp1: using parport1 (polling).
+
+ls -l /dev/parport* shows
+
+crw-rw-r-- 1 root lp 99, 0 Oct 23 11:54 /dev/parport0                           << LPT port on motherboard >>
+crw-rw-r-- 1 root lp 99, 1 Oct 23 12:02 /dev/parport1                           << LPT port via USB dongle >>
+
+Make sure that you are in the group 'lp'. If not, add yourself to it. You need to (re)login to make it having effect.
+
+As for Perl, I had to add some modules with 'cpan'. 
+
+cpan[1]> install Perl::Tk
+cpan[1]> install Tk::ListBox
+cpan[1]> install Tk::LabEntry
+cpan[1]> install Tk::Optionmenu
+cpan[1]> install Device::ParallelPort
+cpan[1]> install Device::ParallelPort::drv::parport
+cpan[1[> install Device::ParallelPort::drv::linux
+
+The documentation on the Internet as on https://ubuntuforums.org/showthread.php?t=1246312
+show how the most essential parport modules are added. 
+For me the third module (Device::ParallelPort::drv::linux), I could not have it done the way described. 
+After modifying the "linux.xs" file and "install Device::ParallelPort::drv::linux" it would fail as it 
+loaded a fresh copy again with a higher number. I solved my struggle by adding temporarely a symbolic link 
+between /usr/include/sys/io.h and /usr/include/asm/io.h. 
+After a succesful "install Device::ParallelPort::drv::linux" in cpan, I removed the link again.
+
+While the Perl-Tk implementation tries to mimmic the galblast version as best as I could, there are some differences.
+I am not a 'fluent' Perl programmer, but I can get most things done as I want in Perl. If someone more capable
+in Perl has hints and/or improvements I am happy to apply these.
+
+As I don't have all the GAL types that the program would support I could not test every corner yet. Bugs may
+hide in the code. But as it is now, it does it work for me. The same for the English grammar, 
+it is not my native tongue, so words may look strange sometimes, help me.
+
+Kees Schoenmakers,  keesgpl at gmail dot com