Sporny Kun Posted September 1, 2021 Share Posted September 1, 2021 The title says all, I have converted the existing schematics into Kicad. This is the 1.0.0 release, and hopefully there will be no erratum. https://github.com/sporniket/kicad-conv ... /tag/1.0.0 The release provides a PDF with the schematics, a PDF with the silkscreen of the motherboard reconstruction, and a ready to use Kicad project (libraries included). For the schematics, I have decided that : Symbols for the ICs will show the physical layout of the pins, as it makes it easier to spot the pin on the real IC (for me at least). And because thanks to that, the GSTMCU still fits on an A4 sized sheets. On one occasion I deviated from this choice (for the dma sound amplification and filtering) as it obfuscated too much the circuit. Each original sheet is splitted so that each sub-part is printable on a A4 sized sheet. A Table of content I also have mentionned some fixes that would be usefull/mandatory. DMA pull-up on databus WD1772 pull-ups LMC audio mix fix RGB Video ghosting fix C415 that should be reversed The projects contains an approximative reconstruction of the motherboard's PCB. It will be good enough to locate a given component and to know how a signal is distributed accross the board. And it allow to make nice 3D renderings. 5 1 Quote Link to comment Share on other sites More sharing options...
rustynutt Posted November 18, 2022 Share Posted November 18, 2022 Thank you for all the time That is a huge effort. Just now starting to do a hand delineation of the Falcon COMBEL to PGA socket adapter, to connections, and Sparrow COMBEL PGA socket to connections. I'm staring at hours and hours of work 1 Quote Link to comment Share on other sites More sharing options...
Sporny Kun Posted November 19, 2022 Author Share Posted November 19, 2022 yep, and then seeing all those hours and hours coming together is greatly rewarding. Quote Link to comment Share on other sites More sharing options...
Cyprian Posted November 20, 2022 Share Posted November 20, 2022 I wonder whether would be possible to squeeze the STE motherboard to the short ST size Quote Link to comment Share on other sites More sharing options...
Sporny Kun Posted November 20, 2022 Author Share Posted November 20, 2022 It may be a little bit tight, but one may save some space by not supporting the external blitter and the modulator/composite encoder. On the other hand, one could reuse some ideas from Exxos's H5 like a modern RS-232 IC that does not require dedicated voltages converters, and using a single 72-pins SIMM. Quote Link to comment Share on other sites More sharing options...
Mauro Rodriguez Posted February 18 Share Posted February 18 where is the original 2 joystick port in this schematic i have an 520st and no have the old classic 2 Joystick port below only have the jaguar style female on the side x 2 Quote Link to comment Share on other sites More sharing options...
TGB1718 Posted February 18 Share Posted February 18 6 hours ago, Mauro Rodriguez said: where is the original 2 joystick port in this schematic The original joysticks are part of the keyboard Quote Link to comment Share on other sites More sharing options...
Sporny Kun Posted February 18 Author Share Posted February 18 13 hours ago, Mauro Rodriguez said: where is the original 2 joystick port in this schematic i have an 520st The STe, like the STF, has moved the joystick ports away from the motherboard, and put them on the keyboard assembly. The 520ST (first version, short case, no integrated floppy, no integrated power supply) is then quite different. I have an ongoing project for this model, the PCB is far from done, but the schematic is usable though : https://github.com/sporniket/kicad-conversions--atari-260-520-st-motherboard--c070231 A pre-release of the PDF is available here : https://github.com/sporniket/kicad-conversions--atari-260-520-st-motherboard--c070231/releases Hope this helps. Quote Link to comment Share on other sites More sharing options...
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