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About selgus
- Birthday April 13
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Orlando, Florida
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I guess I should also make some sort of display plaque of all the different versions of 7800 Cartridge PCBs I've made to get to this point. 😀
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Been working on the stainless steel die press for making the name plates for the portable, but it's not as easy as you'd think. The text is so small, being able to get the tolerances needed to have the dies cnc cut is very challenging. I may have started down a rabbit hole and may need to switch it up. Here are some samples of trying to do it with 3d printing again, after I did a pass to make the text have a bit more height (for the color 3d nylon print on the left). Then I made the text even larger and split up the '7800' and 'PortSYSTEM' text on their own lines, to be able to enlarge the characters even more.. This was printed actually in aluminum (aluminum power is hit with a laser and layer after layer, creates a solid metal part). I do like how this came out, so if I can't get the die press to work, and press the text into a thin aluminum sheet, I will go with the 3d printed aluminum version.
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- 95 replies
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XEGS OS ROM suppliers (apart from Best)
selgus replied to x=usr(1536)'s topic in Atari 8-Bit Computers
My pleasure, sent out the roms today. Enjoy., -
XEGS OS ROM suppliers (apart from Best)
selgus replied to x=usr(1536)'s topic in Atari 8-Bit Computers
Yes, all my motherboards have been NTSC and I am located in Florida. Send me a DM and I can send out one to you.. no charge. -
XEGS OS ROM suppliers (apart from Best)
selgus replied to x=usr(1536)'s topic in Atari 8-Bit Computers
I have a bunch I've removed from XEGS motherboards that were donors for my portables project. -
Thanks, making progress.. I think I have finished the die for pressing the faceplates, now to just get it cnc milled. Once done, I can just put it up on my hydraulic press and make as many faceplates as I wish.
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Another update, another rev of the board.. I didn't like how I routed the audio output around the board, to get to the speaker connector. I wanted to cleanest signal, so I reworked the pcb so that the speaker connector is right next to the audio capacitors. I also have been optimizing the schematic, to utilize more resistor and capacitor arrays, hence lower the part count (building these by hand is tedious, though I think my next step is to utilize my infra-red reflow oven and solder paste, instead of hand soldering). I've populated all the passives (except for the large caps, which I normally do last) and most other parts.. moving to the smd ics next.. I also wasn't happy with the 3d printed faceplate for the product name (there just isn't enough surface area to get crisp full-color 3d prints), so I spent some time designing a die press that I am going to cnc out of steel, and press into aluminum sheet. This is closer to what ATARI actually did for the 7800 console, just on a smaller scale. This way each enclosure will be cheaper, too. This is the die I will be machining..
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Where to buy screws for Atari plastic cases?
selgus replied to aeberbach's topic in Atari 8-Bit Computers
Have you tried looking through McMaster-Carr, as they have a wide selection of general purpose hardware, including screws.. https://www.mcmaster.com/products/screws/tapping-screws~/ -
Building & Testing the Re-imaged Atari 1450XL
selgus replied to Dropcheck's topic in Atari 8-Bit Computers
Are you sure they drilled extra holes that weren't listed in your gerber files? I make 4-layer boards all the time with JLCPCB and never have they added extra holes I didn't specify. This could cause all sorts of problems with middle layers, etc. I do have mounting holes in each of my designs, so maybe they just use those for whatever type of alignment you were referring to. Do you have non-plated holes in your boards for mounting? One of the steps in the manufacture process at JLCPCB is to do a flying probe electrical test, which I assume would find errors with the manufacturing verses what the gerbers specify. -
Sorry, I have put this project on my back burner, to focus on some ATARI portables. I haven't completed the testing on this SEGA portable yet, and would probably want to update some of the lcd video circuitry based on some of my R&D from the ATARI 7800 portable work I have done. Plus getting the working custom chips off a SEGA Genesis motherboard is non-trivial, so this project will have to wait,
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Received the new 2600+ cartridge connector that @Ben from Plaion sent me from ATARI, and did some observations/testing to see what, if anything, this could mean for my portable. Here are the different 7800 cartridge connectors-- left is the original 7800 console, middle is the new one that ATARI will start using in the 2600+ and the right is the right-angle version I'm using in the portable.. The new connector's leads are longer than the original 7800 console, which is good, as the original are too short for the portable. They are the same length as the one's I'm currently using, just not bent. The new one's also have the same keying, which while nice, doesn't really add value to my use of the connector. All the spacings, obviously, are the same.. The downside of the new connectors for use in the portable, is the pins would need to be bent before installation, as the orientation is different than console sitting on a table/desk. These would need to be bent at precise distances/angles, to make sure it fit correctly into the enclosure and makes proper connection with a cartridge. So my conclusion would be, unless I built some sort of jig to bend the pins just right, and the cost of these connectors were substantially less than my DigiKey right-angle versions, I should continue with my current setup.
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Sounds great! I have $46e as the address register, and $46f as the data. Does this map the same with your implementation?
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Still need to install the leds, but want to create a small jig to bend them properly at their right angle.. I had been just using needle nose pilers before, but that won't always be consistent from bend to bend. Also, just have the cartridge port loose fitted, as I will test out @Ben from Plaion 2600+ cartridge port, when it arrives.
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Made some more progress assembling my portable motherboard.. all that's left are the electrolytic caps, some diodes, push buttons and then the sockets..