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Umberto

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Posts posted by Umberto

  1. Posted

    https://www.amazon.com/Positive-Negative-Voltage-Boost-Buck-Converter/dp/B07SJ4ZXYQ/ref=asc_df_B07SJ4ZXYQ/?tag=hyprod-20&linkCode=df0&hvadid=475741834053&hvpos=&hvnetw=g&hvrand=2655686133481039203&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9033519&hvtargid=pla-1032401992282&psc=1

     

    Buck converter will give your -5v rail from the 12v rail.

     

    Like I said in post 35, I have one installed in a Mage ST not a MSTE. Mage ST only has a 5v and 12v rails.

     

    https://www.digikey.com/en/products/detail/mean-well-usa-inc/RQ-85B/7706154?s=N4IgTCBcDaIEoEUC0AOArAIRAXQL5A

     

    Your right this would be a better choice. The other one you listed is to long to fit in a Mega STE 

     

     

  4. Posted

    1 hour ago, bfollowell said:

    I used this same exact PSU when converting my U.K. 1040STE to a U.S. model. With the exception of changing from the nomenclature from CH1, 2 & 3 to V1, 2 & 3 between pages 2 and 5, the documentation couldn't be easier to understand. The incoming and outgoing pinouts are on page five of the pdf documentation. Just double-check those with a meter to make certain they're giving you the voltage outputs you're expecting and you should be good, at least with the PSU.

     

    I'm not sure that PSU will provide the juice you may need for a Mega STE with an internal HD, etc., but it powers my 1040STE with minimal internal, unpowered upgrades quite easily.

     

    It doesn't look like @Umberto told you, but you really should have ordered 3 of these as well:

     

    PSU connector

     

    These would have made things quite a bit easier to wire it in.

     

    Good luck!

     

    I'm running a lightning usb with usb HDD and usb DVD no problems. Has ample power. But meanwell has bigger PSU's if needed

  9. Posted · Edited by Umberto

    9 minutes ago, pixelmischief said:

    Does the one you linked have a -12v rail?

    No but there are that do. The one I have has a -12 rail.  Very small medical grade 50 watts

     

    https://www.digikey.com/en/products/detail/mean-well-usa-inc/RPT-60B/7706127?utm_adgroup=AC DC Converters&utm_source=google&utm_medium=cpc&utm_campaign=Shopping_Product_Power Supplies - External%2FInternal (Off-Board)_NEW&utm_term=&utm_content=AC DC Converters&gclid=CjwKCAiA_eb-BRB2EiwAGBnXXpcBO8WVSd75TYHJ8x0hmVniudGfgenKkB4v92qcW_PqVnTkJmiVXhoCCNYQAvD_BwE

    • Like 1

  10. Posted

    2 hours ago, pixelmischief said:

    @ParanoidLittleMan How many watts will I need this thing to be?  The system has a floppy drive, ET4000, and UltraSatan inside.  I'll also run an optical mouse and NetUSBee externally.

    The Mste will only draw as many as needed. With a physical mechanical hard drive it will need more. Minimum of 50 watts. The stfm psu is 30 watts and it will power a hard drive. If your pluging in a alt psu more is better. Look up meanwell psu's

     

     https://www.trcelectronics.com/View/Mean-Well/RD-50A.shtml?gclid=CjwKCAiA_eb-BRB2EiwAGBnXXlQFzE7a6fmy3Fk93CSseqBcIAVz-k2YUgUcCtplD

     

    they do make them with -12v   

     

    I have one in my Mega st with lots of goodies attached with no problems 

  13. Posted

    On 8/8/2020 at 9:36 PM, -^CrossBow^- said:

    No I don't own a capture device. The video comparison for Rikki & Vikki shown above was done with my camcorder aimed at my LED flatpanel TV. Some of my still pics I've taken using my Nikon on a tripod aimed at the same LED flatpanel. 

     

    As for the LHE drawing more current in a 7800. Anytime you add more components into the system that aren't powered from an external supply, they will draw a little more current from the entire system to keep them powered up. But you can correct some of this by using a larger output voltage regulator. A new 1A output regulator would be fine for most using their 7800s with an AV mod. I put 2A output regulators into mine and most of my clients systems. Now even though the regulators can provide up to 2A of current along their +5 output, you are still going to be limited by the actual power adapter you are using.

     

    The LHE always looked good on a CRT which, is what you guys are comparing your screens from. But on a modern flat panel display, the LHE can turn ugly real quick.

     

    I put a traco power regulator in mine, got rid of the heat sink

  24. Posted

    8 hours ago, michomis said:

    Sorry for being little lazy, but reading 42 pages can take some time...

     

    Is there any reason why 140KB ATX discs won't run on my SDrive Max? These are mostly polish games, like Robbo etc. http://ftp.pigwa.net/stuff/collections/Atari 8bit Preserved Software 2020-01-25/Robbo (1989)(L.K. Avalon)(PL)[disk].zip

    All other stuff loads normally: 90KB discs, cas, atr's.

    Of course, I have tried many OS, turn on/off basic, setup SDM as 1050 etc. All I get is BOOT ERROR at first sector each time.

    My machine is 65XE with Ultimate 1MB. I use 1.2c firmware on SDM. Can it be fixed in SDM firmware maybe?

    Bad file, I have had very few atr's not work. But have had plenty of atx files not work. Try to find it in a atr.

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