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Bruce Tomlin

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About Bruce Tomlin

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    River Patroller

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    CD C9 01
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    San Antonio, TX

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  1. Yesterday I went to get a Roland System 1 synth at a pawn shop that I had been waiting for the next price drop day on it. It's an analog emulation synth, and I wanted it to play around with. It turned out to have a dead high E key (of 2 octaves), and it took me about 2 hours to clean it properly to work again. Hooray for rubber domes and carbon dots! I have a random little Akai keyboard with a dead low C key, so now I'm going to fix it too. On the way I discovered a hole-in-the-wall thrift store and found a PS2 Midway Arcade Treasures 3 for five bucks. The Wii uDraw also can be used with a microcontroller project, like any of the other plug-in controllers. I just buy cheap extension cables from China and cut off the other end. It's so nice that Nintendo used I2C for those. I'm not sure what kind of project I'd do with a pen pad control, but it's good to know in case I come up with an idea. Try one of those universal remotes if you have one lying around. I use one to control a Bose Wave in the next room over (with appropriate line of sight).
  2. What is that artwork on those cartridges? It looks like a few 20-sided dice? Then it had to be from some college thing. No idea what they would go into, but I think that kind of 44-pin connector was pretty common as cheap surplus parts, so it could have been for some kind of custom system. I notice that it has two EPROMs but no decoder chip, so whatever the board plugged into decoded the chip selects for it. Those holes for diodes are interesting, probably some sort of configuration thing for different game sizes.
  3. Bruce Tomlin

    PAX South 2020

    Got my badge in the mail a couple of days ago.
  4. You meant AUDV0/AUDV1 in that table, right?
  5. Could be one of a few things... - cartridge edge connector could be dirty - cartridge slot could be dirty - cartridge slot could be weak from too much use of circuit boards that are too thick (not very common) - board could have a problem like being cracked (chip can be transplanted to a donor board) - chip could be fried First thing to do would be to try it in another system.
  6. You should try a matte tape like Scotch Magic Tape, I remember that works too. But it would need something thicker than a credit card, maybe even an old junk cartridge board. You probably also want it 2 or 3 layers thick. You can even clean it with a q-tip just like a card edge.
  7. Yep, the Videotex is kind of rare. I think basically instead of having BASIC in ROM, they put in the contents of the Videotex cartridge. That would mean it's 300 baud only, as there is no UART, so it uses the horizontal interrupt as a 25x clock for 300 baud. The interrupt takes up a good chunk of CPU time; I once rigged up that driver to work with BASIC, old school BBS style, and it really lagged things.
  8. Yep, looks like someone used it for a security monitor in 1992. Or maybe it was from a VCR with a clock that defaulted to 1992.
  9. I finally dug up the Eagle 6.5 installer that I had been saving for a LONG time. Version 5.x (what I used back in the day) still used the proprietary binary data files, useless for any other program. Version 6 added an XML-based data file format. Version 6.5 was the last one which still used the old license system, where you could still select the freeware license without first signing your soul away to AutoCAD. Well, I finally set it up on the Mac Pro. First I tried to get my old version 5.x working, then I realized it was so old that it was a PPC-only binary! It took an hour or two, just open up each .sch, .brd, and .lbr file, then click on the floppy disk icon to save it in the 6.x text format. Now with all my projects converted to XML, I can start looking into getting KiCad installed. It's been so long since I've used Eagle that I doubt I'll have to do any un-learning to get used to KiCad.
  10. There are coil tuner tools made of plastic, such as amazon dp/B019ZT5OOS
  11. He said "numbered text", so I guess he meant like "01 Combat"? I didn't realize that was one of the original nine. Hmm, a quick look and I found that "11 Indy 500" is indeed one of them. The numbered text carts also came in boxes with cover flaps, and those are really hard to find, I think I have an 01 Combat box somewhere. I have a 5200 4-port that is compatible with the 2600 adapter. I had to learn how to check the board revision through the grille slots on the bottom. I think I found two of them actually. I remember it being CO something something Rev 3. I have a Virtual Boy kiosk that I got from a Blockbuster Video. This was a tabletop-type kiosk, I think there was another kind too.
  12. My opinion is a bad TIA, because the glitch triggers collision detection with the background in more than one game, on the same column. And it would be bad on a background register bit the inside of the chip, not one of the pins. EDIT: it seems the right pixel is missing on the pac-man ghosts too, so maybe it could be something wrong with the D0 line (or is it D7?), whether inside or outside the TIA. That would be pin 14 (34?).
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