Need help with Atari 1050 disk system - test-drb@ccmp.vtda.org

18 Apr 2004

...
   Thanks for the
info - I did a bit of looking and found 
 several references once I mentioned "Atari 400" - turns out 
 the supplies are AC, which probably explains why your DMM is 
 having trouble determining the polarity. 
Interesting - the one I've got here has DC markings on it! Now I'm confused.

Really! - is it the original supply? I'd really like to know FOR SURE before I try
and power this thing up - I think tonight I will take it apart and look to see if
there is an internal rectifier/filter/regulator etc.

Btw, Here are some links so the AC references:

http://www.vidgame.net/misc_utility/cross_ref.htm
http://www.faqs.org/faqs/atari-8-bit/faq/section-35.html
http://www.myoldcomputers.com/museum/comp/atari400.htm

...
 The only Atari machine that didn't have DOS built
in out of the box was the
400. All the rest from the 800 upwards supported disks because they had the
extra memory and ROM commands. It's a while since I've played with any of my
1050s though, but I know where the disks are if nobody with easier access
comes up first. 
Can you (or anyone else) tell me how to access the DOS in ROM? Basically, I
would like to format a disk and write/read something to verify that the drive
is working - as noted previously, I have no diskettes at all for this drive.

Regards,
-- 
dave04a (at)    Dave Dunfield
dunfield (dot)  Firmware development services & tools: www.dunfield.com
com             Vintage computing equipment collector.