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+IBM 3270 Display System support
+
+This file describes the driver that supports local channel attachment
+of IBM 3270 devices. It consists of three sections:
+ * Introduction
+ * Installation
+ * Operation
+
+
+INTRODUCTION.
+
+This paper describes installing and operating 3270 devices under
+Linux/390. A 3270 device is a block-mode rows-and-columns terminal of
+which I'm sure hundreds of millions were sold by IBM and clonemakers
+twenty and thirty years ago.
+
+You may have 3270s in-house and not know it. If you're using the
+VM-ESA operating system, define a 3270 to your virtual machine by using
+the command "DEF GRAF <hex-address>" This paper presumes you will be
+defining four 3270s with the CP/CMS commands
+
+ DEF GRAF 620
+ DEF GRAF 621
+ DEF GRAF 622
+ DEF GRAF 623
+
+Your network connection from VM-ESA allows you to use x3270, tn3270, or
+another 3270 emulator, started from an xterm window on your PC or
+workstation. With the DEF GRAF command, an application such as xterm,
+and this Linux-390 3270 driver, you have another way of talking to your
+Linux box.
+
+This paper covers installation of the driver and operation of a
+dialed-in x3270.
+
+
+INSTALLATION.
+
+You install the driver by installing a patch, doing a kernel build, and
+running the configuration script (config3270.sh, in this directory).
+
+WARNING: If you are using 3270 console support, you must rerun the
+configuration script every time you change the console's address (perhaps
+by using the condev= parameter in silo's /boot/parmfile). More precisely,
+you should rerun the configuration script every time your set of 3270s,
+including the console 3270, changes subchannel identifier relative to
+one another. ReIPL as soon as possible after running the configuration
+script and the resulting /tmp/mkdev3270.
+
+If you have chosen to make tub3270 a module, you add a line to a
+configuration file under /etc/modprobe.d/. If you are working on a VM
+virtual machine, you can use DEF GRAF to define virtual 3270 devices.
+
+You may generate both 3270 and 3215 console support, or one or the
+other, or neither. If you generate both, the console type under VM is
+not changed. Use #CP Q TERM to see what the current console type is.
+Use #CP TERM CONMODE 3270 to change it to 3270. If you generate only
+3270 console support, then the driver automatically converts your console
+at boot time to a 3270 if it is a 3215.
+
+In brief, these are the steps:
+ 1. Install the tub3270 patch
+ 2. (If a module) add a line to a file in /etc/modprobe.d/*.conf
+ 3. (If VM) define devices with DEF GRAF
+ 4. Reboot
+ 5. Configure
+
+To test that everything works, assuming VM and x3270,
+ 1. Bring up an x3270 window.
+ 2. Use the DIAL command in that window.
+ 3. You should immediately see a Linux login screen.
+
+Here are the installation steps in detail:
+
+ 1. The 3270 driver is a part of the official Linux kernel
+ source. Build a tree with the kernel source and any necessary
+ patches. Then do
+ make oldconfig
+ (If you wish to disable 3215 console support, edit
+ .config; change CONFIG_TN3215's value to "n";
+ and rerun "make oldconfig".)
+ make image
+ make modules
+ make modules_install
+
+ 2. (Perform this step only if you have configured tub3270 as a
+ module.) Add a line to a file /etc/modprobe.d/*.conf to automatically
+ load the driver when it's needed. With this line added, you will see
+ login prompts appear on your 3270s as soon as boot is complete (or
+ with emulated 3270s, as soon as you dial into your vm guest using the
+ command "DIAL <vmguestname>"). Since the line-mode major number is
+ 227, the line to add should be:
+ alias char-major-227 tub3270
+
+ 3. Define graphic devices to your vm guest machine, if you
+ haven't already. Define them before you reboot (reipl):
+ DEFINE GRAF 620
+ DEFINE GRAF 621
+ DEFINE GRAF 622
+ DEFINE GRAF 623
+
+ 4. Reboot. The reboot process scans hardware devices, including
+ 3270s, and this enables the tub3270 driver once loaded to respond
+ correctly to the configuration requests of the next step. If
+ you have chosen 3270 console support, your console now behaves
+ as a 3270, not a 3215.
+
+ 5. Run the 3270 configuration script config3270. It is
+ distributed in this same directory, Documentation/s390, as
+ config3270.sh. Inspect the output script it produces,
+ /tmp/mkdev3270, and then run that script. This will create the
+ necessary character special device files and make the necessary
+ changes to /etc/inittab.
+
+ Then notify /sbin/init that /etc/inittab has changed, by issuing
+ the telinit command with the q operand:
+ cd Documentation/s390
+ sh config3270.sh
+ sh /tmp/mkdev3270
+ telinit q
+
+ This should be sufficient for your first time. If your 3270
+ configuration has changed and you're reusing config3270, you
+ should follow these steps:
+ Change 3270 configuration
+ Reboot
+ Run config3270 and /tmp/mkdev3270
+ Reboot
+
+Here are the testing steps in detail:
+
+ 1. Bring up an x3270 window, or use an actual hardware 3278 or
+ 3279, or use the 3270 emulator of your choice. You would be
+ running the emulator on your PC or workstation. You would use
+ the command, for example,
+ x3270 vm-esa-domain-name &
+ if you wanted a 3278 Model 4 with 43 rows of 80 columns, the
+ default model number. The driver does not take advantage of
+ extended attributes.
+
+ The screen you should now see contains a VM logo with input
+ lines near the bottom. Use TAB to move to the bottom line,
+ probably labeled "COMMAND ===>".
+
+ 2. Use the DIAL command instead of the LOGIN command to connect
+ to one of the virtual 3270s you defined with the DEF GRAF
+ commands:
+ dial my-vm-guest-name
+
+ 3. You should immediately see a login prompt from your
+ Linux-390 operating system. If that does not happen, you would
+ see instead the line "DIALED TO my-vm-guest-name 0620".
+
+ To troubleshoot: do these things.
+
+ A. Is the driver loaded? Use the lsmod command (no operands)
+ to find out. Probably it isn't. Try loading it manually, with
+ the command "insmod tub3270". Does that command give error
+ messages? Ha! There's your problem.
+
+ B. Is the /etc/inittab file modified as in installation step 3
+ above? Use the grep command to find out; for instance, issue
+ "grep 3270 /etc/inittab". Nothing found? There's your
+ problem!
+
+ C. Are the device special files created, as in installation
+ step 2 above? Use the ls -l command to find out; for instance,
+ issue "ls -l /dev/3270/tty620". The output should start with the
+ letter "c" meaning character device and should contain "227, 1"
+ just to the left of the device name. No such file? no "c"?
+ Wrong major number? Wrong minor number? There's your
+ problem!
+
+ D. Do you get the message
+ "HCPDIA047E my-vm-guest-name 0620 does not exist"?
+ If so, you must issue the command "DEF GRAF 620" from your VM
+ 3215 console and then reboot the system.
+
+
+
+OPERATION.
+
+The driver defines three areas on the 3270 screen: the log area, the
+input area, and the status area.
+
+The log area takes up all but the bottom two lines of the screen. The
+driver writes terminal output to it, starting at the top line and going
+down. When it fills, the status area changes from "Linux Running" to
+"Linux More...". After a scrolling timeout of (default) 5 sec, the
+screen clears and more output is written, from the top down.
+
+The input area extends from the beginning of the second-to-last screen
+line to the start of the status area. You type commands in this area
+and hit ENTER to execute them.
+
+The status area initializes to "Linux Running" to give you a warm
+fuzzy feeling. When the log area fills up and output awaits, it
+changes to "Linux More...". At this time you can do several things or
+nothing. If you do nothing, the screen will clear in (default) 5 sec
+and more output will appear. You may hit ENTER with nothing typed in
+the input area to toggle between "Linux More..." and "Linux Holding",
+which indicates no scrolling will occur. (If you hit ENTER with "Linux
+Running" and nothing typed, the application receives a newline.)
+
+You may change the scrolling timeout value. For example, the following
+command line:
+ echo scrolltime=60 > /proc/tty/driver/tty3270
+changes the scrolling timeout value to 60 sec. Set scrolltime to 0 if
+you wish to prevent scrolling entirely.
+
+Other things you may do when the log area fills up are: hit PA2 to
+clear the log area and write more output to it, or hit CLEAR to clear
+the log area and the input area and write more output to the log area.
+
+Some of the Program Function (PF) and Program Attention (PA) keys are
+preassigned special functions. The ones that are not yield an alarm
+when pressed.
+
+PA1 causes a SIGINT to the currently running application. You may do
+the same thing from the input area, by typing "^C" and hitting ENTER.
+
+PA2 causes the log area to be cleared. If output awaits, it is then
+written to the log area.
+
+PF3 causes an EOF to be received as input by the application. You may
+cause an EOF also by typing "^D" and hitting ENTER.
+
+No PF key is preassigned to cause a job suspension, but you may cause a
+job suspension by typing "^Z" and hitting ENTER. You may wish to
+assign this function to a PF key. To make PF7 cause job suspension,
+execute the command:
+ echo pf7=^z > /proc/tty/driver/tty3270
+
+If the input you type does not end with the two characters "^n", the
+driver appends a newline character and sends it to the tty driver;
+otherwise the driver strips the "^n" and does not append a newline.
+The IBM 3215 driver behaves similarly.
+
+Pf10 causes the most recent command to be retrieved from the tube's
+command stack (default depth 20) and displayed in the input area. You
+may hit PF10 again for the next-most-recent command, and so on. A
+command is entered into the stack only when the input area is not made
+invisible (such as for password entry) and it is not identical to the
+current top entry. PF10 rotates backward through the command stack;
+PF11 rotates forward. You may assign the backward function to any PF
+key (or PA key, for that matter), say, PA3, with the command:
+ echo -e pa3=\\033k > /proc/tty/driver/tty3270
+This assigns the string ESC-k to PA3. Similarly, the string ESC-j
+performs the forward function. (Rationale: In bash with vi-mode line
+editing, ESC-k and ESC-j retrieve backward and forward history.
+Suggestions welcome.)
+
+Is a stack size of twenty commands not to your liking? Change it on
+the fly. To change to saving the last 100 commands, execute the
+command:
+ echo recallsize=100 > /proc/tty/driver/tty3270
+
+Have a command you issue frequently? Assign it to a PF or PA key! Use
+the command
+ echo pf24="mkdir foobar; cd foobar" > /proc/tty/driver/tty3270
+to execute the commands mkdir foobar and cd foobar immediately when you
+hit PF24. Want to see the command line first, before you execute it?
+Use the -n option of the echo command:
+ echo -n pf24="mkdir foo; cd foo" > /proc/tty/driver/tty3270
+
+
+
+Happy testing! I welcome any and all comments about this document, the
+driver, etc etc.
+
+Dick Hitt <rbh00@utsglobal.com>