Message board for the users of flat assembler.
> OS Construction > Old Printers
After reading a few books and online docs, I decided to put together a few documents pertaining to printer control; particularly, the languages used to control printers. So far I haven't found much about the newer languages, like ESC/P2 and PCL, but I do have ESC/P covered, along with CaPSL and the languages used by the old Diablo and Qume daisywheel printers. Mostly obsolete stuff I have no idea if this will be useful or not, but I think you folks will like it anyways.
If anyone knows where to find out about PCL and the graphics language that is built in to PCL, GL or GL-2, I'd appreciate it. Incidentally, does anyone know of docs for PostScript? PostScript printers are ubiquitous but PS is a very complex language.
I created it with a Windows text editor (QuickEdit), so tables and lists may not show up properly in monospaced-font programs like the DOS EDIT program or in any Linux editors such as emacs or vi. If this is the case, sorry! However, I tried to make it easy to read and understand. This may or may not be useful if you are writing a driver (i.e., for your OS or for an OS which does not have a driver for these, such as DOS). Tell me if they are of any help to you.
BTW, I thought of an idea for implementing print drivers such that they could easily be used by any application, no matter what type of printer is being used:
An application would convert whatever internal file format they use, or call a system call to convert it, to a XML-based language that is printer-independent. It would be the job of the individual drivers to convert this standard language to the printer for which they are driving, and send the
result to the printer. Of course, the in-between language would have tags
for accessing model-, manufacturer-, or print-language-specific features.
This way applications can use their own internal format, the printer can use its' own format, neither cares about the format used by the other one. The application converts it's file to the in-between format and makes a system call.
The OS knows which driver the printer needs (the user has presumably set this up beforehand), and calls that driver. The driver converts the markup language to codes the printer understands, and sends them to the printer, adding any extra codes which the driver wants to add. The printer then prints it.
Does anyone think this is a good idea? Would it be better not to base the in-between language on XML, since this might slow things down (XML parsers can be pretty slow, and we want the whole process to be quick and transparent to the user)?
OS Dev is fun!
Pepsi tastes nasty!
Some ants toot!
|05 Jul 2005, 21:43||
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