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About Simius

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  • Birthday 04/29/1961

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    Warszawa, Poland

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  1. Datasheet update. 1. Terminology update 2. Connectors pinouts added 2. REV register added 3. SYNCTL instead GR10SHD in the GRACTL register. SOPHIA2en_1_2.pdf
  2. I'm already fine. The final PCBs are already in production. The COVID situation can only affect on the shipping time and cost.
  3. I suppose that the blackout followed by graphics corruption indicates a drop-outs on the 3.3V power supply of the Sophia logic. There is several possibilities - damaged 5V main PSU, damaged LDO regulator, too hot LDO regulator (too high ambient temperature or too large load current), weak contacts on the socket. Have you some multimeter? Measure the voltage between ground on the MB and ground on the Sophia board (pin 3). Measure the 5V and 3.3V supply voltage on the Sophia board. Find a largest resistor (4.7ohm) near the right edge of the Sophia board and measure the voltage across it. It should be within 0.65...0.7V. Do it all carrefully because you do it on your own risk.
  4. It's an irrelevant, obvious clerical error.
  5. Schematic is the same, software different. There were also a few changes in later production - 10MHz crystal, RPM switched to 360 and apropriate software.
  6. http://www.jsobola.atari8.info/dereatari/atarisch/xfd601a.zip
  7. There is an XF551 clone with two drives: http://atariki.krap.pl/index.php/XFD602 Because it is my own design, I can tell you, what is missing on the original hardware to control the two drives. It's at least one additional, external RAM byte for saving the WD1772 track register for the inactive drive.
  8. Hello there Simius.
    I could be interested on acquiring a couple of mylars for two of 65XE i have around.
    Are your mylars for the single layer or double layer models? I believe the units i got at home have a Mitsumi mylar.


  9. There is some delay mainly because of the health problems. Hopefully the matter will be resolved before the end of the year.
  10. Hello,

    I was wondering if there are a mylar keyboard for my Atari 130XE. On the original mylar there is a code: FKJ0201131A and in the back of metal shield there is another code C070015.


    Can you help me out?


    Please answer here and to my private email: [email protected]


    Thanks and Kindest Regards,


  11. 1. I know. I have a 800 machine. 2. The CPU board with the Sophia 2 placed in the GTIA socket fits between alu shield walls. 3, 4 - Sorry, I don't understand. Maybe the pictures help explain. Can you mark the clearance you are asking about? If you cut a 1"x 1/3" hole in the right wall of the alu shield, 8-9" ribbon cable is enough, but I think 12" will be good.
  12. 1. Sophia2 requires 5.5mm space above the top surface of the GTIA socket. 2. 0.8" width. What is a max. lenght - hard to say. I didn't check. What is the criterion? Presence of the image or recognizability?
  13. An additional advantage is a simplicity of the color system change (NTSC to PAL or vice versa). All you need is to change ANTIC and the main crystal/oscillator. A 4.433MHz crystal and 74LS74 IC are not needed.
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