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#1 justrob OFFLINE  

justrob

    Space Invader

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Posted Sat Mar 28, 2015 12:42 AM

Finally getting the chance to pull out my atari stuff, and I wanted to focus on my 1050 drive first, as I know my 800xl works just fine.

 

From a previous thread, I was told that this drive has a homebrew US Doubler mod of some kind in it. Last time I tried using it, I had written notes that maybe the drive mechanism was bad or something.

 

I don't have my 800xl out to plug in and test, and I don't have floppies of any kind to try and load DOS or something from the drive. If anyone has any suggestions on how to test the drive from cart basic, that would be helpful.

 

So, here are my checks.

 

First, a few of pics of the internals for an overview:

 

https://www.dropbox.... 59 AM.jpg?dl=0

https://www.dropbox.... 09 AM.jpg?dl=0

https://www.dropbox.... 22 AM.jpg?dl=0

https://www.dropbox.... 37 AM.jpg?dl=0

 

You can see in this last pic, the spring for the drive inject/eject is fine, but the little plastic ring it connects to has broken. I temporarily moved the spring to the plastic in front of it and it works ok for testing. I dunno if I want to leave the spring as is with the cover on and in normal use. Springs flying around moving parts and electronics are bad juju.

 

https://www.dropbox.... 02 AM.jpg?dl=0

 

Drive motherboard:

https://www.dropbox.... 48 AM.jpg?dl=0

https://www.dropbox.... 56 AM.jpg?dl=0

 

I'm not sure what this plug is for. I'm guessing it has to do with the stepper motor or something. Looks like it matches up to J15. In fact, there is another cable connector hanging out of the back of the mechanism that look like it was supposed to connect to J15. I tried both (yes I know, unknown shit fries shit). With the original brown connector, everything spins as it should, but it's really loud. With the blue connector on J15, all the same motions happen, but it's MUCH quieter and buttery smooth compared.

 

https://www.dropbox.... 41 AM.jpg?dl=0

https://www.dropbox.... 44 AM.jpg?dl=0

 

Since I don't have the computer itself out of the closet to plug into and test, I made a couple of quick little videos to show what it does when powered on:

 

https://www.dropbox.... 06 AM.mov?dl=0

https://www.dropbox.... 21 AM.mov?dl=0

 

Both of these were taken with the red connector on J15 as above. 

 

From the video, you can see the seeker carriage moves. I tried the jumping the first two pins on J10 trick to see if it returns to the back of the carousel, and it does and seems to be seeking just fine.

 

Is there anything I'm missing here? Is there any way to test this thing without functional software of any kind?

 

The disk I used to test the motor and such is a DOS formatted HD disk. Not usable in this drive, but it was a physical boilerplate just to test the mechanics.



#2 1050 OFFLINE  

1050

    Dragonstomper

  • 799 posts

Posted Sat Mar 28, 2015 8:28 AM

They never sound butter smooth, but you can oil the head rails very, very lightly and this can help a lot with noise. The blue plug is obviously your head connection and it's being placed on the wrong pins. It goes up front on J6. From front of drive to back - red, white, blue and yellow, black and sheild/ground. My blue plug is black and is a very skinny thing with only one row of holes. Can I assume someone has changed it?

J15 is red wire to the front with yellow wire to rear marked as pin 1 and this is stepper motor connection not the heads. You may have cooked the windings in your heads?

Other areas of interest are jack 1 and how it's been taken apart and re-wired to be in line with all the other jacks of that row of jacks - never have seen this before. J1 is always offset in dozens of drives, no exception except this one of yours. Wire colors are installed correctly though with yellow to the front, grey, blue then red.

Jumpers are correct for eprom OS which you do have, and it does appear the the RAM 6810 has been stacked and wired as per US Doubler installation. If it was done correctly however can't be determined by just photos.
http://www.wolfpup.n...ds/usd-ram.html

Don't think there is a way to really test the drive without a working system to support it. A workout program does exist that constantly runs the drive into the dirt reading, writing, and access of various sectors. But I don't think it operates from the drive as stand alone. You boot it up and it is moved to the computer and runs from there to wear out a disk over the entire day IIRC. Don't know what it's called or where it's at though, sorry. Only have heard about it and seen the Atari 1050 OS code disassembly which is replete with the self test code which won't even be inside this US Doubler eprom anyway.

Your disk eject spring is an over sized monster, perhaps that's why the plastic ring broke? Mine measures 1/8 inch in total diameter and is basically close coiled at eject position. Very fine wire measures .011 too. Otherwise it looks good from here.

#3 Paul Westphal OFFLINE  

Paul Westphal

    Stargunner

  • 1,212 posts
  • Location:Portland, Oregon

Posted Sat Mar 28, 2015 9:06 AM

If you give up, my drive guy is in California
Paul Alhart - p.alhart@verizon.net

#4 justrob OFFLINE  

justrob

    Space Invader

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  • 27 posts

Posted Sat Mar 28, 2015 10:25 PM

Well, I put everything back together as instructed by 1050. I managed to dig out my 800xl and get it up and running today. I have the drive sitting next to it, but with the SIO cable unplugged. Not really sure how else to go about testing without floppies or DOS of some kind though.

 

After reseating the connectors, it all still works as it did before. Motor and head carriage move as they should and sound just as noisy as ever.

Any suggestions short of getting a SIO2PC cable of some kind and some blank floppies?



#5 russg OFFLINE  

russg

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Posted Sun Mar 29, 2015 1:29 AM

Well, I put everything back together as instructed by 1050. I managed to dig out my 800xl and get it up and running today. I have the drive sitting next to it, but with the SIO cable unplugged. Not really sure how else to go about testing without floppies or DOS of some kind though.

 

After reseating the connectors, it all still works as it did before. Motor and head carriage move as they should and sound just as noisy as ever.

Any suggestions short of getting a SIO2PC cable of some kind and some blank floppies?

In order for the 800XL to talk to/from the disk drive, you need a disk operating system booted, DOS.  The only way you're going to do that

is with a boot floppy or a SIO2PC/APE interface with boot floppy .ATR mounted.  So, yes, you need SIO2PC and/or some floppies, blank or

with boot DOS or something on them.

Well, the 800XL OS does have code to boot a floppy, so you might get some activity on the drive with just a SIO cable, when you turn

the computer on.  But this would only be a momentary light flash and movement of the drive.

Both switches in the back of the 1050 must be to the left for drive one.

Opps.  No, there will be no activity from the drive without a floppy in it.  You have to put a floppy in and then the drive willl recognize it.

The cheapest thing would be to buy or somehow get a DOS boot disk, 2.5 or MyDOS or SpartaDOS, etc.  You can get a DOS 2.5

disk from Best or B&C or Video 61, or someone willing to mail you one.

An APE interface would open up everything for you.  You would still need a floppy in the drive though.


Edited by russg, Sun Mar 29, 2015 1:56 AM.


#6 1050 OFFLINE  

1050

    Dragonstomper

  • 799 posts

Posted Tue Mar 31, 2015 5:42 PM

Actually there is another way but you still need MD floppies to write on. You convert available cassette files to audio and feed it into the Atari in boot cassette mode and you have DOS 2.5 in residence ready to format your disks and to write DOS 2.5 out to them so you can now boot a DOS. From there you use a 5.25 360K drive in an old PC and transfer files and programs to the Atari via that means as I still do.

BUT a SIO2PC cable is the fastest way if you don't want to hassle with the above. You still need MD disks. You can try to format your HD disk but when I do that here it fails to complete the format so I would consider it a wash as far as an actual test goes. You would see the drive attempt to work at least.

http://atariage.com/...n/#entry1565431

http://atari.kenscla...8utilities.html

http://www.horus.com...atari/#ataridsk




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