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archeocomp

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About archeocomp

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  1. I measured resistance on non workin one and it was around 100-150Ohm. How much is yours? I then sprayed some contact cleaner in the litle holes. No change. Then I desoldered it. Suddenly it measured 0Ohm. Heat (and possibly cleaner) fixed it. I soldered it back, job done.
  2. Well I need a short cable (like 10cm) to interconnect my two stacked 1050s. No one sells them though.
  3. 256kB 800XLE is MY Atari, workhorse. If you ever wanted to reinstall, I shared second ClausB 16kB bank version PCB on OSH park
  4. https://www.pcbway.com/project/shareproject/Atari_600XL_keyboard_adapter_to_1mm_pitch_FFC_cable.html https://oshpark.com/shared_projects/2DM5q3aX Schematics is trivial, all resistors are 470 (1206), except R21 which is 3.3 Ohm (reset line). FFC cable and connectors are 1mm pitch, 26 pin. (floppy drive type) If you will use reversed cable, you will also need two different types of connectors (bottom and top contact). With a non reversed cable, the same connector type will be used. I have used round pin header to make soldering keyboard side adapter a relaxing exercise. Than just cut off what was no needed.
  5. Leads means cables? Old VGA cables should do. They are for zero price.
  6. I've got a 600XL off eBay sold as not working. To my surprise it was working fine but keyboard cable and connector were damaged beyond repair. So I designed (in march!!) solution around 26pin 1mm FFC cable used commonly for notebook floppy drives, as I happened to have both connectors and cables already in my supply. There are adapters on both sides of cable from 2.54mm -> 1mm Adapter on keyboard is made be PCBWay from 0.6mm substrate. It took more than 2 months to arrive btw.. I tried two adapter(s) for motherboard. Green one is also 0.6mm PCBWay with through hole components. Brown one is OSH Park Flex PCB which is only 0.1mm thin!! It is probably thinner than the original flex cable Atari used. They both work. But I will stick to OSH Park material. 600XL is now sound and happy. I think I will let OSH make also keyboard side adapter from Flex. Currently I can still insert sheet of paper between keyboard platics and top side of the ffc connector. With Flex it would be much more space left. If there is interest I will publish all the projects. FFC cable is 20cm, Atari original was 15cm.
  7. With that reasonong all 3.5 drives with their 360rpm would be real diskette killers. Similarly all 5.25 high density 1.2MB drives as they spin at 360rpm too.
  8. It is not my blog 🙂 I just drawn the correct one schematics. The one without voltages. And provided Igi (it is his blog) with some pictures depicting transformer windings and transistors. I quite do not believe your XE is toast. It apparently still works. In case of overvoltage Freddie is usualy first to go and that means blank screen (not sure, never happened to me). This power supply has only very weak 15V rail, just to provide enough energy for the LM723 stabilizer. I am quite positive that under load (at least 600mA) your power supply would not show any overvoltage. My wild guess is that LM723 stabilizer IC failed and now input pin nr.12 (V+) is internally connected to pin nr.10 (Out). And I hope that this internal connection if fairly weak and can not cause severe damage to Atari. How exactly did your power fail? What happened? Can you measure voltage of broken power supply with resistor load? Can you specify what power supply are you using now?
  9. This a european power supply I like very múch. I have drawn schematics. http://blog.3b2.sk/igi/post/Napajacie-zdroje-Atari-600XL-800XL-130XE-800XE-65XE-XEGS-Power-supply-Atari-typeIV-part-5.aspx IT can be repaired easily
  10. Rings are caused by dirt on drive head. Which in turn is caused by bad diskette. So one bad diskette will cause damage to all subsequent diskettes until the heads are cleaned.
  11. Higher voltage is caused by resistors divider circuit. Those resistors can be seen in posted pictures. 7805 is not connected directly to the ground, but (to compensate for cable/connector losses) through a resistor divider circuit which makes it output slightly more than 5V. When these resistors burn out, 7805 looses ground reference and goes high.
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