spinnaker15136

Ah yeah I know that. Trying to remember if I wrote it or someone else did. Did you read my post?

I never asked for a double density disk. I do not have an SIO2PC. I have seen them for around $60. Can I find cheaper? What are mu other options? Can I get on of the SD Memory drives and load it on there first with my PC? I still need to try formatting. I have a few blank disks. I will try later. I might need to pick up more but only double density seem to be available these days. Please remind me. Can a double density floppy disk be formatted single density? I believe so but can't remeber for sure.

Show me where I am asking for a double density disk in my post. Unless everyone has enhanced density? A single density disk can't be formatted on an enhanced density?

Not all that hard if you can solder. Just need to be careful with the shield which does not have a sheath. I did not do it on my cable but you can get shrink wrap. Or in a pinch nail polish works as a good insulator. I have used it in a number of projects. Thought for $10 it is not worth the hassle. Wow that is a pretty good deal. I probably paid $6 for a set of 5 5-pin DINs. And I had one for the longest time and threw it out with an old monitor.

Well I got my 38 year old Atari 810 up and running. Which I understand is somewhat of a miracle being it is one of the orginal drives. Well it sort of works. Not all my disks are bootable. The original DOS works just fine along with a number of games. But I have 2 DOSXL copies. One boots sort of. The other seems to boot but when I do a DIR, I get garbage. And the drive sounds like it is reading a bad sector. So I am not sure if I have a bunch of bad disks or I still have an issue with this drive. Any place I can a copy of DOSXL or similar on single density 5.25"? Is it legal for someone to send me a copy? I of course will cover costs. I am in the US (Pittsburgh, PA).

Also at least I know the SIO is working which was the original purpose of this thread.

Looking through my old Atari 800 disks and found something labeled CIO.LIB, does that ring any bells? For the live of me I can't remember if I wrote it or got it someplace. I can't even remember how to use it. I have the original Atari BASIC, BASIC XL and MAC 65. I know what the CIO is but what the heck is CIO.Lib? I did write a CIO driver for a RS232 interface I designed back in the day. Not sure if it was that or not.

Yeah I can't boot all of my disks. I have 2 DOSXL disks. Can only boot one. And when I do a DIR with it, I get garbage for the list. Original DOS disk boots fine. And does a dir fine. If I do a dir of the dosxl disk it fails. So I don't know if I have a bad drive or several bad disks. Any place I can get a DOSXL disk? I wonder if replacing the belt would help? Does the 1050 diagnostic kit work on the 810? Figure I would buy one but in case the 810 does not pan out, I would have the kit for the 1050.

Got it to boot! I flipped the drive belt over and that is what did it!

Tore it apart the drive found a date . May 1981! That baby is almost 40 years old.

Unless I can get the replacements really cheap. It might be throwing good money after bad. Might be best to just put the money into a working 1050. I don't even know for sure if the drive is working.

Rust on mine? Maybe it looks that way in the photo. I am seeing no rust. Only the isolation sheet. , maybe a bit of thermal paste bt that is about it. and yes I saw the rest of that information too.

I emailed best to see if they have the replacement board. Not finding it on that site of tiers.

Photo of mine posted above.

Then both of those manuals must be out of date too. Both refer to that device as a transistor. The one calls it a Pass transistor . Funny, I can't find Q113 listed in either manual. There must be a third manual. The Atari Mania on lists a 7812 but does not assign it a part number and does not seem to show it in the schematic. Or at least does not appear to show it as the schematic in that manual is very fuzzy.

And when I look at it closer. the artwork on the PCB seems to be different. I don't have that crosshatch on top of the board.

Not mine. CO 14786 0 0 2

This is what mine looks like.

My power board looks the same. Drive is different. So what does the updated one look like?I will upload a pic of mine in a bit.

I DID go to the link you provided thank you. In my post above you will see that I could not read the schematic so I found another copy. Does Best carry the updated 810 power boards? I will try and look around on their site later this after noon.

That is NOT a 7812. I thought is was at first too. The circled is Q113. It is a power transistor. Regulation is provided by Q114 and Q115. I am getting reasonably clean power on pin 2- of the connector. So I need to ohm out the board and see what I thought was the collector on Q113.

Triangle wave is coming from the switcher. But I dont't know if that is noraml or not to be sitting atop the 12V like that. I would think that switcher would have its own filter cap but I see none.

There is no 7812 in the 810 schematic. There is only 9VAC in so the best they can do is ~8VDC. They use a boost switcher (they call it a doubler) to get 12V from the regulated 5V (7805).. Regulators are not my strong suit and it has been 40 years since I was in tech school but this is the way I understand it. . The BOM on the linked manual above lists a 7812. but gives no part number nor component number.. The manual I attached does not list it at all. There are only 3 TO220 packages in the 810. Two are clamped to the base plate. One of them is a 7805 and the other a power transistor Q113. The other t0220 is near the SIO connector and it is another transistor. It has a clip heatsink. If there is a 7812 on board I would like to know where it is.

Found a manual with a better schematic. Seems to be a slightly different Rev. The one linked above lists a 7812 for some reason, which is really condusing as there does not appear to be a 7812 on the board. 810.pdf

Does a better schematic exist for the 810?: The one in the linked manual is not very readable. I am trying to find the 7812 circuit. A 7812 is connected to J104 correct? I seem to have some issues there. 12V output 5V noise