Re: [cc65] OT: user port printer driver for C64

On 2009-02-02, at 23:22, Groepaz wrote:

>> I'm looking for a printer driver which enables printing to a  
>> centronics
>> (parallel) printer connected to the user port.
>>
>> I need the source code, too, in order to find out how to drive the  
>> 6526
>> correctly.
>
> personally i'd have a look at the speeddos kernal ... first make a  
> diff
> between the speeddos kernal and the original (so you see the  
> differences,
> somewhere in there must be the centronics code) then trace the  
> kernal chrout
> call to device 6 (i think that was used for centronics in speeddos)

I don't recall what SpeedDOS used but 6 was the 1520 printer/plotter.  
If they would use number six, they would have effectively disabled the  
plotter. Wouldn't they? OTOH I don't say they didn't ;-) Dolphin  
(which I used heavily those many years ago) used regular device  
numbering so it was not a problem. Anyway - if not SpeedDOS then  
DolphinDOS had the "Centronics" routines too.

> and you
> should quickly end up in the routine you are looking for :) shouldnt  
> be
> terribly complex or anything either.

I guess - basically PETASCII conversion plus BUSY/STROBE?

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