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Centronics Printer on CPU 68340

2003-11-14 by Zeller, Joachim

Hello List,

I've to design an Board with a CPU 68340 and Centronics Interface for
printers. 
Have anybody of you an idea how to realizing this.
The actual idea is to use a PIA to have enough I/O's.
Have you an idea which PIA can be used for this.
I've found a PIA in older Designs but this one isn't an actual product an will not be produced.
Are there some ohter possibilities with IC's to realize the Centronics interface.

Thanks to all who can help me.

Jo
:-)



[Non-text portions of this message have been removed]

Re: [68300] Centronics Printer on CPU 68340

2003-11-14 by Mike Turner

The Centronics parallel interface is very easy to implement. One past 
implementation for driving daisy wheel printers used the SGS/Thompson 
or  Hitachi 6821 PIA with some 74ls240 buffers. 74ls373 or 74ls374 
latching buffers could also be used. Be aware there are various 
handshaking protocols. Some are very easy and some are a pain to 
implement but not all that difficult.

Mike Turner
Simpsonville, SC

On Fri, 14 Nov 2003 15:02:11 +0100
  "Zeller, Joachim" <Joachim.Zeller@...> wrote:

Show quoted textHide quoted text

>Hello List,
>
>I've to design an Board with a CPU 68340 and Centronics Interface for
>printers. 
>Have anybody of you an idea how to realizing this.
>The actual idea is to use a PIA to have enough I/O's.
>Have you an idea which PIA can be used for this.
>I've found a PIA in older Designs but this one isn't an actual 
>product an will not be produced.
>Are there some ohter possibilities with IC's to realize the 
>Centronics interface.
>
>Thanks to all who can help me.
>
>Jo
>:-)

Re: [68300] Centronics Printer on CPU 68340

2003-11-14 by Robert Yablonski

Be aware that you should not drive any line with 373 or 374 type 
latches.  These devices will interpret line reflections as instructions to 
flip the state of the internal flip-flops.  I know after shipping 5000 
units with the defect.  Always buffer with a 240 or equivalent to prevent 
your output latches from being effected by the driven element (line and load).

Robert. Yablonski


At 03:02 PM 11/14/03 +0100, you wrote:

Show quoted textHide quoted text

>Hello List,
>
>I've to design an Board with a CPU 68340 and Centronics Interface for
>printers.
>Have anybody of you an idea how to realizing this.
>The actual idea is to use a PIA to have enough I/O's.
>Have you an idea which PIA can be used for this.
>I've found a PIA in older Designs but this one isn't an actual product an 
>will not be produced.
>Are there some ohter possibilities with IC's to realize the Centronics 
>interface.
>
>Thanks to all who can help me.
>
>Jo
>:-)
>
>
>
>[Non-text portions of this message have been removed]
>
>
>
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Re: [68300] Centronics Printer on CPU 68340

2003-11-14 by Mike Turner

Thanks. I have shipped several thousand units using 24x buffers but 
did not know about the problem with 37x latches. It explains some 
weirdness seen on some lab prototypes...

Mike Turner

On Fri, 14 Nov 2003 08:18:22 -0800
  Robert Yablonski <yabo@...> wrote:

Show quoted textHide quoted text

>Be aware that you should not drive any line with 373 or 374 type 
>latches.  These devices will interpret line reflections as 
>instructions to 
>flip the state of the internal flip-flops.  I know after shipping 
>5000 
>units with the defect.  Always buffer with a 240 or equivalent to 
>prevent 
>your output latches from being effected by the driven element (line 
>and load).
>
>Robert. Yablonski
>
>
>At 03:02 PM 11/14/03 +0100, you wrote:
>>Hello List,
>>
>>I've to design an Board with a CPU 68340 and Centronics Interface for
>>printers.
>>Have anybody of you an idea how to realizing this.
>>The actual idea is to use a PIA to have enough I/O's.
>>Have you an idea which PIA can be used for this.
>>I've found a PIA in older Designs but this one isn't an actual 
>>product an 
>>will not be produced.
>>Are there some ohter possibilities with IC's to realize the 
>>Centronics 
>>interface.
>>
>>Thanks to all who can help me.
>>
>>Jo
>>:-)