Homebrew PCBs

>> Me wrote:
>> 
>> 16.384" drum
>> 1000 dpi
>> 600 RPM (10 r/s)
>> 1 bit per pixel
>> 8 bits per byte
>> 
>> I get 20 kilobyte per second
>> 
>> Am I missing something
>>

> Jon wrote:
> Yes, probably that I wrote that in my
> sleep.  OK, my machine has a 6.519"
> diameter drum, or 20.480" circumference

OK - Me bad that time.  I have a 16.384"
circumference.  Now I have drum envy.

> and a 1024 pulse encoder multiplied by
> 20 to give 20480 pixels per rev, at 10
> RPS.  So, that gives 204800 pixels/
> second.  Since this was designed to
> eventually allow 8 lasers to lay down
> 8 raster lines at a time it now only
> uses one bit per byte, so the DMA port
> has to supply 204.8 K bytes/second,
> which is no problem for even an ancient
> PC.

OK - thats he big difference to mine.
I am doing 8 pixels per byte.

I had never even considered the posibilty
of trying to line up 8 lasers at 0.025mm
spacing.

I cant even fathom how it would be done
at home.

We dont have the option at home of
giant lasers and DMD (Digital Micro
Mirrors) devices.

And I guess at home we also don't care
about waiting 16 minutes for a page to
print.