8bit Printer Port (Paul Bauriedl) - Revision history

Bryce at 11:44, 6 September 2013

2013-09-06T11:44:25Z

← Older revision		Revision as of 11:44, 6 September 2013
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	This [[8bit Printer Ports\|8bit Printer Port]] expansion is described in the book [[Maschinenspracheprogramme und Hardware-Erweiterungen für Schneider CPC's]] by [[Paul Bauriedl]]. It ~~does~~ externally ~~connect~~ to the 7bit printer port (and the 5V power supply) of the CPC and doesn't require internal modifications ~~inside of~~ the CPC.		This [[8bit Printer Ports\|8bit Printer Port]] expansion is described in the book [[Maschinenspracheprogramme und Hardware-Erweiterungen für Schneider CPC's]] by [[Paul Bauriedl]]. It connects externally to the 7bit printer port (and the 5V power supply) of the CPC and doesn't require any internal modifications to the CPC.

	== Description ==		== Description ==

MacDeath at 16:53, 19 December 2010

2010-12-19T16:53:31Z

← Older revision		Revision as of 16:53, 19 December 2010
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	</pre>		</pre>

	[[Category:~~Hardware~~]] [[Category:DIY]]		[[Category:Printers and printer ports]] [[Category:DIY]]

Nocash at 11:39, 24 July 2010

2010-07-24T11:39:42Z

← Older revision		Revision as of 11:39, 24 July 2010
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	This [[8bit Printer Ports\|8bit Printer Port]] expansion is described in the book [[Maschinenspracheprogramme und Hardware-Erweiterungen für Schneider CPC's]] by [[Paul Bauriedl]]. It ~~only connects~~ to the ~~centronics~~ port of the CPC and doesn't require internal modifications.		This [[8bit Printer Ports\|8bit Printer Port]] expansion is described in the book [[Maschinenspracheprogramme und Hardware-Erweiterungen für Schneider CPC's]] by [[Paul Bauriedl]]. It does externally connect to the 7bit printer port (and the 5V power supply) of the CPC and doesn't require internal modifications inside of the CPC.

	== Description ==		== Description ==

Nocash at 13:10, 27 February 2010

2010-02-27T13:10:52Z

← Older revision		Revision as of 13:10, 27 February 2010
Line 1:		Line 1:
	This [[8bit Printer Ports\|\|8bit Printer Port]] expansion is described in the book [[Maschinenspracheprogramme und Hardware-Erweiterungen für Schneider CPC's]] by [[Paul Bauriedl]]. It only connects to the centronics port of the CPC and doesn't require internal modifications.		This [[8bit Printer Ports\|8bit Printer Port]] expansion is described in the book [[Maschinenspracheprogramme und Hardware-Erweiterungen für Schneider CPC's]] by [[Paul Bauriedl]]. It only connects to the centronics port of the CPC and doesn't require internal modifications.

	== Description ==		== Description ==

Nocash at 13:10, 27 February 2010

2010-02-27T13:10:41Z

← Older revision		Revision as of 13:10, 27 February 2010
Line 1:		Line 1:
	This 8bit Printer Port expansion is described in the book [[Maschinenspracheprogramme und Hardware-Erweiterungen für Schneider CPC's]] by [[Paul Bauriedl]]. It only connects to the centronics port of the CPC and doesn't require internal modifications.		This [[8bit Printer Ports\|\|8bit Printer Port]] expansion is described in the book [[Maschinenspracheprogramme und Hardware-Erweiterungen für Schneider CPC's]] by [[Paul Bauriedl]]. It only connects to the centronics port of the CPC and doesn't require internal modifications.

	== Description ==		== Description ==

Octoate: forgot categories

2010-02-27T11:51:08Z

forgot categories

← Older revision		Revision as of 11:51, 27 February 2010
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	330 retour: jp #07f8		330 retour: jp #07f8
	</pre>		</pre>

			[[Category:Hardware]] [[Category:DIY]]

Octoate: initial version - please have a look at the description (I am not sure if this is detailed enough)

2010-02-27T10:59:52Z

initial version - please have a look at the description (I am not sure if this is detailed enough)

New page

This 8bit Printer Port expansion is described in the book [[Maschinenspracheprogramme und Hardware-Erweiterungen für Schneider CPC's]] by [[Paul Bauriedl]]. It only connects to the centronics port of the CPC and doesn't require internal modifications.

== Description ==

In this design, only the lower 4 bits of the printer port are directly connected to the printer. The upper 4 bits are generated with the help of a latch (LS 75). If you want to print, you have to send the upper 4 bits in D0-D3 and set D4 to high to buffer the values in the latch which is connected to D4-D7 of the printer. The rest of the data can be sent by the normal printer routine of the firmware (with D4 set to 0 to disable the latch).

== Schematics ==

[[Image:8bitPrinterPortPaulBauriedl.png]]]

== Listing ==

<pre>
10 ;Patch fuer 8-bit Centronics
20 ;direkt unter HIMEM (+Floppy)
30 ;
40 indjmp: equ #bdf1
50 ;
60 org 42619-40
70 ;Initialisieren
80 ld hl, (indjmp+1)
90 ld (retour+1),hl
100 ld hl,bit0
110 ld (indjmp+1),hl
120 ret
130 ;
140 ;neue Ausgaberoutine
150 ;ist ueber Druckerindirektion
160 ;#BDF1 eingeschleift
170 ;
180 bit0: ld b,#ef
190 push af
200 srl a
210 srl a
220 srl a
230 srl a
240 out (c),a
250 set 4,a
260 out (c),a
270 res 4,a
280 out (c),a
290 pop af
300 and #0f
310 ;Jump wird beruecksichtigt
320 ;je nach System!
330 retour: jp #07f8
</pre>