The Newmanry History

53H Page 339

is for making counts at fixed settings. It stops the machine after printing

prevents Colossus from sending impulses to the printer, so that stepping

clears all scores in storage: in particular if PCO is in use it allows

The printer is an electromatic typewriter.

It can be operated manually for the insertion of data (e.g. sigma , S.T.

Single, double and triple line feed are available.

The inexplicably assorted founts are not intended for cryptography, but

is a device whereby Colossus counts only over a selected stretch of the

There are three groups of decade switches (Fig 58(xvi)) above the plug panel

START COUNTERS , START PSIS , END OF SPAN.

If "start counter" is set to m. where m is not 0000, "end of span" to n ,

If "start counter" is set to 0000, spanning is ineffective, the first place

The settings on Colossus refer to the start of the tape, not the start of

Motorizing of the PSI's begins at the place to which "start psis" is set:

there is a rudimentary 5th decade in the bottom row of the selection panel.

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