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= Original Soviet Tetris on BIG IRON Howto =

'''WORK IN PROGRESS'''

This howto documents our efforts to reproduce as close as possible the original Tetris experience in a real-hardware setup.

{{attachment:tetrus.jpg}}

Emulation approach on a common PC is described in [[OriginalTetrisHowto]]. 


So, here we will explain how to install TETRIS on a real DEC PDP-11/34 running RT-11 and also cover some useful tricks. 

== Recipe ==

We will use:

 * USB - RS232 Serial converter 
 * A pc with Linux Mint
 * CKermit from columbia.edu 

We assume that you have a running PDP-11 with RT-11 installed. Our is a PDP-11/34 :)

== CKermit ==

We need to use KERMIT protocol to transfer files between a PC and a PDP-11. 

=== CKermit PC side ===

You can just install it:

{{{
sudo apt-get install ckermit
}}}

=== CKermit PDP-11 side ===

This is somehow complicated. How can you transfer KERMIT on the PDP11... without kermit itself? 

Source of information is http://www.columbia.edu/kermit/pdp11.html

"Bootstrapping" section is what you need to put KERMIT in your PDP11 :)

== TETRIS ==

You need TETRIS.SAV, the program for RT-11. You can found it here: http://pdp-11.ru/mybk/hobot/ukdwk_archive/dwkwebcomplekt/rt11_symbol_games/

== Connecting to our PDP-11 with Kermit ==

On PDP11, you launch KERMIT.SAV

{{{
RUN KERMIT
}}}

and write at his prompt:

{{{
set file bin
set line tt:
set attributes off
server
}}}

On PC side: 

check what TTY is related to your USB/Serial converter! Normally is /dev/ttyUSB0 but can also be /dev/ttyUSB1 or whatever. Assuming /dev/ttyUSB0 is coorect, you just have to launch kermit, and write at his prompt:

{{{
set port /dev/ttyUSB0
set line /dev/ttyUSB0
set speed 9600
set flow xon/xoff
set carrier-watch off
set attributes off
robust
connect
}}}

After that, you can use GET and SEND commands on the PC to transfer files.

== Other stuff ==

TODO:

 * Using ftape? to put kermit on PDP11
 * KSERVE usage?
 * ???

== References ==

 * http://www.columbia.edu/kermit/pdp11.html
 * http://pdp-11.ru/mybk/hobot/ukdwk_archive/dwkwebcomplekt/rt11_symbol_games/
 * https://codehosting.net/blog/BlogEngine/post/Kermit-on-the-PDP-11.aspx 

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CategoryMuseo