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Showing results for tags 'Schematics'.
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In my effort to provide documentation for lynx, I've started a new task : "vectorisation" of the Atari Lynx Schematics. I've done it with KiCAD. The schematics are based on the 4 part of Atari Lynx Hardware Schematics This is not the "final" version. Some parts were hard to read/understand. If you see any mistake, please feel free to report it. Schematics v0.1.pdf
Hello TIer! I recently look for TI-99/4A schematics and found the usual material on WHTech FTP-Server. But these schematic diagrams are not very useful. They contain errors, are badly readable and you can't do nothing else than watching them. Unfortunately I can't find any digitally captured schematics, so I started to make some new by myself. The first schematic I redraw was the one of the TI console. I took this original as a template. Currently this schematic could contain more errors than the original, because I can't decipher all the small printed and unsharp displayed values and reference numbers of the components correctly. But it should be possible to generate or design a new PCB from it. With this work I also try to separate some function blocks into its own schematic sheets. So the schematics for the console is split into multiple files: CPU Sound Video Keyboard (with Joystick and cassette port) RAM/ROM 8 to 16 bit switch, which generates the A15 GROM logic I/O Ports internal address decoding My work is published in a new repository on the well known git hoster bitbucket. All schematics are (and should be) created with the KiCad EDA, a cross platform and Open Source Electronics Design Automation Suite. I hope here are some people who are willing to support this activity. Greetings!
I need help in finding of schematics of a homemade Soviet TTL arcade machine (read more from here) from this book: M.A. Ovechkin, DIY video games. I couldn't dig up very much information about the book nor about the author (googling his name just came up with pictures of some hockey player). Good luck with finding this book or the schematics from it.
"My detailed study of them will show me that they were not reliable: Several errors slipped inside. The first step was a precise study of the logic of the microcomputer in order to detect all the errors. It was a very interesting step." Fabrice Montupet made this statement in his TI(ny)-99/4A thread in June '17. So far I have not found any errors in the schematic that I have. I can imagine he has had many requests for details on his findings. I do not wish to waste his time if he has already provided this information somewhere. I did search for a while, and I found schematics for what I presumed was the PAL version of TI99/4A, because it had a TMS9928A. But then I saw that it still had a 10.7 MHz crystal, so it couldn't be PAL. A little research revealed that the TMS9929A is the PAL version of the 9928A. Since Fabrice lives in France I further presume the PAL version would be the one he uses (I think I recall him saying somewhere that the 9929A was his favorite VDP ), and this schematic would be the one that has the errors? Or perhaps he is referring to differences between the NTSC schematic and the PAL version? I really just want to know if I need to be wary of errors in the NTSC schematic for now. However, in my search for schematics, I have not come across any for the beige version of the TI99/4A. I understand there were some significant changes made in how things are decoded in these units. Is this info out there? If so, where is it? Thanks, HH