Hacks, repairs, arcade games, sci-fi, and some very bad ideas with possibly humorous consequences
This is not the first time this has been done, and it s probably not as polished as it could be, but it s mostly an archive of what I learned doing this so either I, or anyone else can learn form this process. I wanted to take a stab at giving the Magnavox Odyssey 2 RGB [ ]
This is a somewhat generic idea, but I ve implemented it for a specific purpose. In trying to be able to dump all the TMS7000 series processors internal mask rom I ve come across some pretty unique ones. The latest ones are the TMS70C46 processors found in the TI-74 basicalc and the FIA-10 financial calculator. These calculators [ ]
Do not use git branches, this is a way to lose shit you ve been working on. Do not use git stashes, this is a way to lose shit you ve been working on *and it s not backed up anywhere*. Git is just too complicated to use all of it and expect to not lose stuff. I m [ ]
I ve taken a liking to this small, simple speaker and when I went to go recommend it to someone as a diagnostics tool I found that you can t get it anymore. Not retail anyway. This is my attempt to make a work-alike version and maybe eventually it will get cleaned up into a version that [ ]
I fucked up. One of my latest projects did not immediately work and it s for the dumbest reason. This also has implications on past projects too, so buckle in. This project will be featured next, but the important thing right now is that it uses a headphone jack. I have a preferred headphone jack that [ ]
The last board variant I have done is the 0021 lights board. Architecturally this is very similar to the character board, but even from the earliest variant this board never had audio functionality. That means the designers used all 16 outputs from the PIA on this card to drive 24v controlled lights. The lion s share [ ]
There is a whole whack of these, but there aren t a ton of changes from one to the next so I ll go over all the details with the first one, then I ll only go over the differences from board to board. This is the rev.a character board 0004. The only difference between this one and [ ]
The third board I m going to try to explain is the audio board. This one was harder to do than the others because even though the transport board had an incorrect and incomplete schematic, this board had no schematics. That means I had to put together these replicas based on a bunch of reasonably good [ ]
The second board I m going to talk about in this series is the transport board. This board controls the Teac X-7 reel-to-reel machine and processes the audio from one of the tracks into serial data. This one I have a schematic for, but it s not for any version that I think existed for real. It [ ]
I ve spent the last several weeks staring into my light table and generating board designs. Most of these designs are replicas of designs I have the real boards for. That is mostly for complete-ness and to have the designs in KiCAD for ease of diagnosing problems and seeing what net each trace belongs to. Some [ ]