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DavidMil

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Posts posted by DavidMil

  1. Posted

    8 hours ago, toddtmw said:

    Welcome back. It’s funny. I received an email from one of the threads I am subscribed to with a post from you and I was like, wow, I haven’t seen a post from him in a long time. 

     

    And now I know why. 

     

    Hope everything turns around for you. 

    Thank you!  I was a bit surprised at the changes to AA.  They have been saying that changes were coming for a while, I'm glad to see the upgrade.

    Now all I have to do is figure it all out again!

     

    David

  2. Posted

    9 hours ago, Mclaneinc said:

    Welcome back David, sorry that you got ripped off by the insurance people but its second nature to them. Photo's of stuff is quite normal these days as are the usual receipt rules even though if you get washed out then its very unlikely a receipt will get through that. Won't be long before they refuse the photo's as well.

     

    As they say, the only way is up, glad to see you and welcome back to new and improved AA :)

    Thank you Paul.  It's nice to be back.

    David

  3. Posted

    8 hours ago, BillC said:

    The difference is the pinout, at the time the 850 was introduced in 1979 the official connector was the DB25. Atari eliminated un-needed pins and used the DE9 connector instead, with special cables to connect to standard DCE/DTE devices.

     

    When IBM introduced their PC/AT computer in 1984 they also used the DE9 connector, but with a different gender/pinout, which has since become the commonly used RS232 DTE connection.

    Atari's RS232C pinouts:

     

    1.    Data Terminal Ready (DTR) out

    2.    Carrier Detect (CD or CRX) in

    3.    Send Data (TD) out

    4.    Receive Data (RD) in

    5.    Ground

    6.    Data Set Ready (DSR) in

    7.    Request To Send (RTS) out

    8.    Clear To Send (CTS) in

    9.    As far as I know this pin was not used, except for Port 4 where it was a constant negative voltage.

     

    Someone want to post the pinouts for the industry standard RS232 port?

     

    David

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

  5. Posted

    On ‎6‎/‎12‎/‎2019 at 9:34 AM, Justin Payne said:

    I struggled as well but my first problem was not having the correct serial cable but it seems you are using a official Atari serial cable so that's one problem down. 9600 might be too fast. Try dropping it down to a more reasonable 2400 baud. I can look at my settings when I get home tonight to compare them to your settings.

    I've always been curious what is the difference between an Atari serial cable and a standard RS232 cable?

     

    David 

  7. Posted

    Just wanted to say hello to everyone and let everyone know that I'm back.  Even though we only got about a half inch of water in the house

    it started a nightmare!  For two months we walked around on a bare concrete floor with the lower two feet of all the sheetrock walls cut

    out.  You could literally stand at the front door and bend over and see who was in the bathroom in the back of the house!  The insurance

    company did us right on the structure but they don't recognize antiques (if something is over 4 years old it is worthless).  We have a table from

    the 1850's that has porcelain rollers and they gave us 0.0 dollars because it's over 4 years old.  Anything you list over 100 dollars has to be

    accompanied by a photo or you'll get nothing!  Make a long story short, we'll get about 5 cents on the dollar for our lost possessions.

      I've been away for so long, I've got a lot of catch up reading to do.  I see the sight has changed a bit too!  Well, it's nice to be back!

    I hope every one else is well!

     

    DavidMil     

    • Like 2

  9. Posted

    My wife is doing well after her back problems and just when we finished paying off the doctor/hospital bills along comes a flood!

    We were lucky compared to all our neighbors who got between 8 and 12 inches of water (we only got about an inch in the

    house, and never lost electricity). Problem is our entire home except baths and kitchen is carpeted (about 1800 sq. feet).

    So the carpet is all siting on the curb along with the baseboards and some of the furniture. One table with my wives' PC on

    it broke and I've got to dry it our before I can check it out. The adjuster will be here tomorrow and we will see what happens

    next. Anyway, long story short, we are safe and well and have flood insurance. I'll be back as I can.

     

    DavidMil

     

    PS. Several people have asked me why I don't have an avatar, Well I have on now and I'll post it as soon as I can.

     

    DM

     

    • Like 5

  11. Posted

    It seems to be generally pretty well accepted that the code in the 850 ROM has no capability to individually address each data line, similar to how there is no way to print a $9B (Decimal 155) byte, as there was no way to escape it in the firmware.

     

    However, with exploitation of the undocumented "test and execute" command in the source code as warerat has done with his utility to download the firmware from the 850, I think this should be possible by using custom uploaded code to directly manipulate the PIA parallel port lines.

     

    Rewriting the ROM wouldn't be possible for most Atari users, and besides, I wanted to test the 850's as the were so any problems

    in the hardware could be corrected. I've made a test board to turn on an LED for each line if it goes high and different colored LED's

    for the four control lines. I guess I'll have too live with that. Next I'll make a smaller SMD board. Here's a picture of what I have...

     

    DavidMil

    post-47264-0-93460500-1557171642_thumb.jpg

    post-47264-0-87031900-1557171679_thumb.jpg

    • Like 4

  13. Posted · Edited by DavidMil

    Not that this isn't an interesting topic, (it is), i was just wondering if there was another reason why David is interested in this?

     

    For about a year I've been trying to find a way to individually address the eight data lines of the printer port on the

    850. Even thought a lot of people have said it's not possible, I keep looking. I came across this program in my

    searches. I thought it was an interesting little program. That's all.

     

    DavidMil

  14. Posted · Edited by DavidMil

    Here is a little Basic program to look at the printer output of you Atari and the 850 printer

    port. This works on my RX80 and I'm wondering if it works with other Epson printers too.

    Hold down the FF button while you turn the printer on. Then run this little Basic program.

    If it works correctly you should get a Hex printout starting at 00 and ending at FF. You may

    have to take your printer offline for it to print the last line. Holding down the FF at power

    up, puts the printer in Hex dump mode. In this mode the printer will print all the data that

    it receives in Hexadecimal regardless of what is sent to it. Not really of much value, but

    kind of interesting.

     

    10 FOR N=0 TO 255

    20 LPRINT CHR$(N);

    30 NEXT N

    40 END

     

    Anyone with an Epson printer, let me know if this works. You're also welcome to try it

    on other printers too. You'll have to look in your user manual to see if your printer has

    a hex dump mode.

    DM

     

    DavidMil

  15. Posted

    That's so cool, very much appreciated! I remember reading previous threads about the test mode and thinking something like this might be possible.

     

    Maybe printing some kind of checksum or hash (ZIP compatible CRC32?) on screen as part of the program might be helpful to help people running it determine if they have a ROM with a known dump, or something new, without having to then transfer the file to the PC or have others on AA to check the file?

     

    I ask because I'm tempted to start a new thread with a title specifically as a campaign for all 850 owners to run it to check if we can find the additional versions suspected to exist. (at least 2)

     

    I'm also in favor of starting a new, "Calling all 850's" type thread. I ran the program on all three of my 850's and all of them are 2CF990B9.

    Attached is a pic of one of my 850 result screens. One comment about warerat's wonderful program; If you have more than one 850 you'll

    want to rename the file after each save or it will overwrite the results of each previous save with the info of subsequent saves. Other than

    that; this is a really great utility! Hats off to warerat!

     

    DavidMil

    post-47264-0-36290200-1556860552_thumb.jpg

    • Like 3

  16. Posted

     

    Any program that has a File Explorer type feature for ATR files can do this. In Altirra, for example, open the disk drives menu with the ALT+D key combo. From there, click the little arrow-looking symbol and select Explore Disk from that menu. You can add or delete any file into the ATR that will fit. There is similar functionality in RespeQt, ATR Tools and others.

     

    Thank you DrVenkman. Downloaded and ran Altirra 3.1 and it worked beautifully!

     

    DavidMil

  22. Posted

    The problem is the stepper motor! I pulled the transport out and plugged it into one of a good 1050. As soon as I turned on

    the drive the stepper motor started vibrating back and fourth maybe a mm and everything started getting hot! I guess the motor

    started dying when I first discovered the problem and has now died totally.

     

    Anybody know where I can get a MSAF200A91 Sanyo Part # 4Z26 12V DC stepper motor?

     

    David

  24. Posted · Edited by DavidMil

    R

     

    More likely you have the jack installed backwards.
    Or somebody else did and that is what pooched the
    U2/3 chips.

     

     

    When you say 'jack', are you referring to J15? Remember that this drive worked ( well, mostly worked)

    for awhile when I first tried to use it. Then I could smell the burning and it's been dead ever since. I don't

    think that removing the EPROM and putting a ROM in there for a few seconds before I remembered the

    jumpers that needed to be changed would cause this problem. With either chip in the drive it started

    heating up. When I get the replacements for U2 & U3, I'm going to try turning it on with J15 disconnected.

    (That's after I ohm out the stepper motor).

     

    David

  25. Posted

    I was wondering, what do you guys use for a multimeter?

    Are logic probes still used all that much in troubleshooting & bench operations?

     

    I have an old MeTex multimeter from about 1992 and my 'O' scope is a 40 MHz Kikusui that is about 10 years older

    than that. I have a logic probe but I've found that the scope is much more reliable and flexible.

     

    DavidMil

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