C128DCR built-in Parallel Printer Port

[MIRKOSOFT]

Hi!

Someone who owned my C128DCR before me did one customization: To rear side of C128 implemented Parallel Printer Port - from I think userport...
I don't know how to access - simple action had awaiting reaction: access to device #4 - DRIVE NOT READY...
Also don't know which driver to find...

Thanks for every reply.

Miro

[BigDumbDinosaur]

Without additional details, there's not much to offer in the way of help.  Since running a printer from the user port is not a supported feature of the C-128 kernel, you will need to load a device driver to intercept the kernel OPEN, CLOSE, CKOUT, CLRCH and BSOUT calls to drive the port.  Doing so is a topic that is well beyond the scope of this forum.

That said, code already exists to implement Centronics output at the user port.  See http://www.csbruce.com/~csbruce/cbm/transactor/v9/i3/p032.html for an example.  The driver associated with the article works from BASIC and assembly language.