[Coco] Serial to usb printers
gheskett at wdtv.com
Tue Jun 5 22:12:41 EDT 2012
On Tuesday, June 05, 2012 09:49:12 PM Luis Fernández did opine:
> I do not know enough hardware to do this but I wonder?
> If the serial, the coco, has input and output, and 5V
> And the usb I think, has something similar, but at high speed (tien
> 4-wire input and output voltage) Can anything be done or already done
If you are talking out driving a modern usb driven printer via the coco's
bit banger, there are currently 2 ways I use often. I did, before
drivewire, run a couple scripts on this linux box that monitored the usb
port created by connecting the bit banger port to a ser-usb adapter,
waiting for something to be sent to /p on the coco/os9 system, writing it
to a file, and when the data stopped, assumed EOF and sent it back to a
printer plugged into the same hub as the ser-usb adapter was, using the
cups 'lp' facility, which used ghostscript to convert the text into a
rasterized image the printer understood.
However, since I have a 6309 in my coco3, and as nitros9 has never
readjusted the /p timings such that "xmode /p bau=6" actually ran at 9600
baud, which has to be pretty closely matched for the adapter to function.
For my system, the default timing of 13 at bootup, giving around 12.5 to 13
kilobaud, needed to be slowed by the utility that can adjust that to
something in the 30 to 31 area.
Nowadays I use drivewire, which uses one of its 16 data channels as a
printer port, doing the same thing except at 115 kilobaud. The printer
itself is a $120 B&W Brother HL2140 laser that runs at 21-22 pages a minute
using the default font. Fastest printer I've ever had on my coco, and
beautiful output as lp can also specify any truetype font that exists on
this machine. Big, black fonts will of course use up an $85 toner
cartridge faster though.
The older bash scripts are on my web page, but the drivewire solution is
better, I don't have to fiddle with /p port speeds.
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