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spinnaker15136

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Posts posted by spinnaker15136

  2. Posted · Edited by spinnaker15136

    Trying to follow the calibration procedure. First I don't know how they expect you to get a probe clipped onto those components. ;)

     

     

    C155 looks like a resistor to me. C154 a diode? Maybe a glass cap? Never saw one of those. Am I reading the diagram correctly? Probe goes on the "top " of C154 and "bottom" of C155?

  4. Posted · Edited by spinnaker15136

    Making big progress. Reseatted all chips again. Also Q104 appeared to be smashed down with leads touching. Straitened the leads. Disk drive is now responding to power on of computer but I get a boot error. I am on a work break from my real work right now but wanted to give this update. Later I will look at the manual for timing procedure.

     

    At least SIO appears to be working. ;)

    • Like 1

  5. Posted

    Well I really should be headed off to bed but had to giv that flow chart a quick look first.

     

    If I followed things right I get to Does motor and busy light go off after 7 seconds which it does. So I go to 8C-22 which is the diagnostic cartridge which I do not have.

     

    I will try to check out the rest tomorrow but need to get some sleep. ;)

  6. Posted · Edited by spinnaker15136

    downloaded from the very links I provided you...

    and now posted here.

     

    attachicon.gifAtari_810_Disk_Drive_Service_Manual_Rev_2.pdf

     

    please take the time to examine what everyone is providing you.

     

     

    Oops sorry. Not thinking. Just got back from the emergency room for my 93 yo mom for the second time this week after giving her the Heimlich for the second time this week. Finally got them to admit her tonight.

  7. Posted

    When you say it 'goes through its startup procedure', do you mean the following:

    1. Spin up, seek head to track 0

    2. idle some seconds spinning

    3. seek to track 39, spin down

     

    If the drive is doing that, then it means at least the ROM, stepper, and basic mechanical functions are working.

     

    Next, have you verified the drive select switches are set for Drive 1?

    attachicon.gif810drivecode.png

     

    Lastly, do you notice any difference in the startup behaviour of the computer with and without the drive attached? If the computer interacts at all with the disk drive, you should here some different sounds/delays different to that with no drive attached at all. (Or not configured as Drive 1)

     

    Correct on startup.

     

    Switches are set correctly.

     

    No difference on startup sound or operation. Few seconds of buzzing then Memo Pad.

     

    Might as well continue on this thread

     

    http://atariage.com/forums/topic/290460-reading-writing-the-atari-400-800-serial-port/

     

    since it has morphed into an 810 repair thread. ;)

  8. Posted

    Old electrolytic caps tend to dry out. A lot of people say they should be repaired. I dumped my old Tek for a digital scope after repairing it (think it was a deflection issue) and saw how packed that PSU was. I dreaded having to tear into that so on eBay it went.

     

    I replaced more than my share of filter cap on old TVs. It was really funny with some customers that knew just enough about TVs to be dangerous. They were bound to ask you if it was THE condensor or THE tube. :)

  9. Posted

    provided you have a DOS 2.0 disk inserted after the drive is turned on and then power up the 800 you should get get a DOS menu etc. If you turn on the drive while a disk is still in it the disk could get corrupted, if you turn the drive on after the 800 is on, you won't get anytghing either.

     

    check a101 a104 a106

     

    go to page 8c-24 of the manual near 195 of the pdf...

     

    although considering the way you are posting and how this is going, maybe you should consider pdf page 184, 8c-19 in the fsm...

     

    follow the clearly laid out logic/block/flowchart diagram, it contains simple yes no questions to walk you thru this and it also provides voltages and scope examples.

     

    this will walk you thru from power up on.

     

    check out the 4069 while you're in there

     

    alternatively page 134 of the pdf appears to have another set you can follow as well...

     

    it really shouldn't take too long to work through this.

     

     

    We must not have the same 810 service manual. The one I have only has 10 chapters. Last page is 10-5.

  11. Posted

    in field service see the section about the sio id switches, and the chip for id select...

    make sure the sio cord is good as well..

     

     

    What should I look for on the switches? I have confirmed that they are set correctly. I do see the PSU right after that but don't see where they can be found on the board. I am still can't locate -5V

     

    Not finding references to "and the chip for id select." I do see the reference to the PIA that reads the switches.

     

    Is there a physical layout of the 810 boards somewhere? Just finding a schematic.

  13. Posted

    Just issuing a CSAVE command from Basic can determine if Pokey is able to transmit. Just enter a couple of lines first with random characters after REM.

     

    If you have a floppy drive that doesn't respond it could be numerous things. First up would be to flip the ID switches back/forth and then back to drive 1 to ensure they're not giving a false reading. Continuity of the cable next.

     

    On the Atari side, a faulty PIA can cause problems since it's used to control the /Command line, and most (all?) non cassette peripherals won't work without it.

     

     

    Thanks for the CSAVE tip. SIO appears to be working. At least output. I entered a few lines in BASIC. Typed CSAVE and heard a tone on the TV speaker. Square wave appeared on scope.

  14. Posted

    after power switch is off a few minutes...

     

    make sure power brick is good, make sure switches have been move to d1: position a few times...

     

    what when power is turned on to 810 the first time?

    does the head move at all? does the hub spin?

    if no head movement turn off power and make sure it will move towards the center hub and that the hubs belt is good as well as able to spin...

     

    if it broke free either broke free like they were stuck try it again... if it spins and the head moves, try a disk if not...

     

    check the power supply external and internal voltages

    and then double check that all is seated correctly, no bent, folded under, missed or miss- aligned pins

     

    failing all of that it's field service manual time...

     

    since there are a number of issues mentioned across the threads, find the 810 fsm here at

    http://www.atarimania.com/documents/Atari_810_Disk_Drive_Service_Manual_Rev_2.pdf

    and many others at

    http://www.atarimania.com/documents-atari-400-800-xl-xe-technical-documents_3_8.html

     

     

    Already mentioned disk drive goes though power up procedure. Head moves disk spins.

     

    I have +5V +12V in the 810. Not sure where to find the other voltages. Looked at the 810 service manual but did not see where they were located.

  16. Posted

    did you clean the 810's heads? are you certain the disk is good?

     

    Yes cleaned the heads. I tried a couple of different disks. But the head does not move at all. Clean / bad head or bad disk, shouldn't the 810 at least try to read?

     

     

    And can someone refresh my memory? With BASIC cart in, I type DOS correct? Will that cause DOS to be loaded in memory? Right now it just goes to memo pad. And with no cart, nothing happens on power up of the computer.

     

    Just to make sure I am doing it right. Power up 810 (it goes trough its power up routine). Power up computer with no cart. Bootable disk should be loaded correct?

  17. Posted

    Tape operations don't know if a device is present - aside from the fact that a successful block read means there very likely is one there.

     

    I've got a non responsive 810 too... I'd put odds of an 810 being at fault 99 times out of 100 vs the computer.

     

     

    Never used CSAVE. Can I place it in a line of the code and loop to it? Working right now, on a brak but I could try it later.

  18. Posted · Edited by spinnaker15136

    Just issuing a CSAVE command from Basic can determine if Pokey is able to transmit. Just enter a couple of lines first with random characters after REM.

     

    If you have a floppy drive that doesn't respond it could be numerous things. First up would be to flip the ID switches back/forth and then back to drive 1 to ensure they're not giving a false reading. Continuity of the cable next.

     

     

     

     

    Already tried those things thanks. Including reseatting all chips in the 810, all connectors and the side board. 810 goes though the power up routine but does not load a disk.

     

     

    Will CSAVE still try the SIO even if there is no device responding?

  20. Posted

    This looks promising

     

    https://www.atarimax.com/jindroush.atari.org/asio.html

     

    But time to get some sleep now. Real work tomorrow.. :(

     

     

    Than again maybe not so promising. :) But it looks like $E459 is the wrong track. Looks like that is for talking to one to the devices. I think I need to go deeper since I really don't have a device. Unless it is going to put data out on the port anyway?

     

     

    OK time for sleep now. Really. :)

  22. Posted

    Look at Mapping the Atari. $300 is a good place to start.. Look at SIOV $E459. here: Mapping The Atari-Memory Map

     

    $300 is the device handlers. 

    $E459 looks more promising but I can't make heads or tails of what that document is trying to say.

    But I think I need to go deeper. I think I nee to set the clock with

     

    AUDF4 $D206 but still havn't figured out how to set the frequency.

     

    Then set bit 5 of SKCTL $D20f Found this in my OS guide. Again not entirely sure I understand what they are saying about it in the memory map in the link you provided.

     

    Finally write to SEROUT $D20D

     

    I addition to the frequency of the clock, what I can't figure out is how to know if the transmit buffer is busy or not. I can't remember if I can poll it or have to use an interrupt vector.

     

    Of course I would like someone to confirm all of this theroy.

     

    I must have been a lot smarter close to 40 years ago. ;)

  23. Posted · Edited by spinnaker15136

    Can anyone point me to a simple code example for talking to the SIO port? I did this about 30 years ago and darn if I can remember how. I know I had to set the audio frequency register for the clock or baud rate. but still trying to digest the OS manual on how I did that. for the desired frequency. also I know that I set SKCTL for async but in this instanse I want to use sync.

     

    Can anyone help?

     

    Basically I am trying to determine if my SIO is working on the 800.

     

     

    This thread looked promising but I am not seeing the Atari end of the code.

     

    http://atariage.com/forums/topic/209010-sio2pi-raspberry-pi-as-a-floppy/

  24. Posted · Edited by spinnaker15136

    I couple of repair type questions I have had go unanswered. Hey no complaining. I just understand folks do their best to help This just might not be the best forum for repair. Hang out on an Electronics forum with lots of helpful people. But when I had a problem with my tech scope they couldn't help me. Said I should Join the Tech mailing list. My scope was fixed days after I joined.

     

    So is there a repair forum out there I should be joining? If so PM me if need be. Thanks

     

  25. Posted · Edited by spinnaker15136

    Did anyone ever use Pascal? Lol, when I learned it in school, it was always presented as a 'teaching language' and not really used in the real world.

     

    Ironically my first job out of college involved maintaining the code for a system written in Pascal :)

     

     

    I used Borland Turbo Pascal long before C.

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