just to inform all interrested persons, I started yesterday working on this topic.
I already know the GPIO setup of the raspi and printing on a network printer via cups-->samba works fine.
Just the HW interface from gpio to centronics is missing for a simple ascii printout. I hope I can present the same within 2 weeks.
here the video.
http://www.youtube.com/watch?v=Ywi9rU6A ... e=youtu.be
I have uploaded it 5 minutes ago, youtube says it is available within 65 minutes. So it may be available at the 20th January ......
I worked a bit on the printer emulator. SW is now working with some bugs concerning scaling, but I think I will get it stable soon.
SW now supports ASCII + Graphics printout. Seems to be compatible with a lot printers (ESC/P) ....
>It is slowly progressing - the main problem is getting the C code to translate the Epson control codes to PDF for printing -
> there are a few solutions out there, but they do not handle graphics!
Graphics part I finished mainly. Just scaling when printing from a Linux PC works not well. However printing under DOS with DPaint works perfect.
When I solved the Linux issue, I will test the same with an Atari ST and a ZX81 with a parallell interface, and a Spectrum .....
Concerning the PCB I am at the last steps to have a protoype for parallel. Here the pictures:
The project also has a name - The Retro-Printer and we have released the sources for the conversion software as a new project on Github - Printer To PDF - Epson printer capture software
There is still more work needed on the software side but a new PCB layout is currently with the factory and expected back in the next few days.
One thing we are short of, is fonts compatible with the various Epson printer character tables as it would be nice to emulate all of the variations.
So all users of "naked" Zeddies or Speccies (having no additional Centronics interface) could use it instead of Sinclair- or Seikosha-printers?