Robotron 6313

The Robotron 6313 printer was a 9-needle dot matrix printer manufactured by the VEB Robotron (East Germany)

What made it special and worth mentioning in the CPC-Wikipedia is the fact that it could be DIP-switched to be 100% compatible with the Amstrad/Schneider NLQ401, that means it could print the whole CPC character set and understood the code sequence to switch the 8th bit.
In Western Germany it was sold under the names Präsident 6313 or Europrint FT80X

Technical Specs.

Mechanical data (excerpts)
print principle:	serial dot matrix printer with pin system
print speed:	100cps
print direction:	bidirectional with logical optimization for the print head movement
number of pins:	9
copies:	1 original plus 2 carbon copies overall thickness max. 0.3mm max. areal weigth 80g/m²
printer cassette:	type 615 FBK 1 Tally 1000 or equivalent
Electrical data
input voltage:	220V +10%/-15% 110V +10%/-15%
frequency:	47-63Hz
power consumption:	max. 70W
Environmental conditions
temperature:	10-35°C
rel. humiditity:	40-90%
noise level:	max. 58.5dB (AS)

Manual

Setting DIL switches
Nr.	Function	OFF	ON
5-1	case contact	don't use
5-2	not used
6-1	paper end contact	active	inactive
6-2	buzzer	active	inactive
7-1	autom. line feed (LF)	no LF on CR	autom. LF on CR
7-2	autom. carriage return (CR)	autom. CR on LF	no CR on LF
8-1	character set	Set 2	Set 1 (incl. umlauts)
8-2	buffer full condition	print+LF	print only
9-1	CANcel mode	valid	invalid
9-2	character codes	IBM	Schneider
10-1 10-2	font	see table 1
11-1	Zero	O	slashed 0
11-2	line feed	1/6 inch	1/8 inch
12-1 12-2	paper format	See table 2
13-1	1 inch feed over paper edge	active	inactive
13-2	control codes compatible with	IBM/Schneider	EPSON
14-1	NLQ	inactive	active
Centronics Interface
14-2	Signal /INIT	external	internal
15-1	Signal /AUTO FEED XT	external	internal
15-2	Signal /SELECT IN	external	internal
16-1 .. 18-2	no function

Table 1 - Font

		Switch position
		10-1	10-2
PICA	1/10"	OFF	OFF
ELITE	1/12"	ON	OFF
condensed	1/17"	ON	ON
bold	1/10"	OFF	ON

Table 2 - paper size

	Switch position
	12-1	12-2
12 inch	OFF	OFF
11 inch	ON	OFF
6 inch	ON	ON
5.5 inch	OFF	ON

Control codes (additional to IBM PC control set)
ESC = = Select switched character set
Encoding:

CHR$(27); "=";

Function:

This command selects the printable characters that equal the 7-Bit characters from CHR$(1) to CHR$(127).

The reception of the command ESC = results in bit 8 to be regarded as 1 for all received characters.

NUL = Unselect switched character set

Encoding:

CHR$(0);

Function:

The reception of the command NUL results in bit 8 to be regarded as 0 for all received characters.