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I require the Clerk to automatically be signed off
at the end of each transaction (909-D) but then
immediately produce after transaction receipt after
sign off.

This feature is available on Version G ROM of the
UP600/700.

Is it possible to have a key for itemised Bill
printing.

The GC Receipt key operates differently on this
machine to others.
However you could create an Auto key:

Misc.. Func/2/Enter/subtotal.

This will 

display all open tables ready to print

select one from here to print.

Is it Possible to remove the 1 X print on the
Kitchen Printer.

Yes, In PGM 2 there is a OPTION setting from
here select Printing Select then change QTY 1
Print on KP to NO.
It is not possible to remove the 1 x text on the
operator display.

What is the maximum distance the kitchen
printers could run from on the RS232 ports ?

Under tests we have had cable runs of 70 Metres,
but you should use Twisted pair cable to achieve
this.