68kMLA Classic Interface
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| Mirror video out from SE/30 | |
| Posted by: ereuter on 2026-05-03 06:41:26 I would like to be able to mirror the built-in video from my SE/30 to a projector with HDMI input in my classroom. I have tried to make sense of the various adapters at Joe's Computer Museum and other similar stores, but I can't quite figure out what I need. It seems like I need some version of the RGBtoHDMI device, but I'm not sure what I need to connect that to the logic board. A pass-through connection? A splice? | |
| Posted by: mikes-macs on 2026-05-03 08:16:28 I just watched on Adrian's Basement how to do this to a Macintosh Classic. That machine doesn't have expansion slots for video cards so he wired it up directly to the LB. The SE/30 does have an expansion slot for an 8bit video card but they are hard to find and can be expensive and only get you part way there. VGA on mine. You could probably use his technique to adapt your SE/30 to do the same as he did to the Classic. | |
| Posted by: ereuter on 2026-05-03 08:46:22 Thanks! My machine has a 24-bit video card in it, but it’s the internal display I want to project. I’ll check this out. | |
| Posted by: Callan on 2026-05-03 10:28:24 Yeah. Sounds like you need an RGB to HDMI Here is the github that explains it. hoglet67/RGBtoHDMI: Bare-metal Raspberry Pi project that provides pixel-perfect sampling of Retro Computer RGB/YUV video and conversion to HDMI · GitHub https://share.google/KuwZ5ieGRWKPoXH1b | |
| Posted by: ereuter on 2026-05-03 12:55:46 I watched the video. This seems perfect. Maybe I can even mount the whole thing inside the case. | |
| Posted by: JCM-1 on 2026-05-04 12:17:23 Ron McAdams and I sell pretty much the perfect pair of items for this: A J12 Passthrough board and MacPicoVid. | |
Posted by: ereuter on 2026-05-04 12:39:49Ron McAdams and I sell pretty much the perfect pair of items for thisI had seen these, but it didn’t seem like it supported HDMI? | |
| Posted by: ereuter on 2026-05-04 12:45:24 I also cannot find the J12 passthrough board in the shop. I see a breakout board. | |
| Posted by: JCM-1 on 2026-05-04 12:48:40 HAHAHA! I retract my previous statement. J12 Passthrough is discontinued. (Great job, Joe!) The converter does not support HDMI - VGA only. Ron had designed these for the purposes of making Catalog Macs, so perhaps the fit isn't exact. | |
| Posted by: ereuter on 2026-05-04 14:20:22 Bummer. I’ll find another solution. Probably just solder wires to the analog board. | |
| Posted by: arroz on 2026-05-10 13:25:36 Hi! You can (probably) use MacDVI, a project I published a few days ago that uses a Pico 2 for sampling and HDMI generation, if you adapt the code for the SE/30: https://codeberg.org/arroz/MacDVI Most of the code should be the same, but there may be some small differences in timing and polarity (and is the SE/30 512x342 or 512x384? If 384, a constant or two might need adjustment as well). RGBtoHDMI is a great product, I have one here! The advantage of MacDVI is being much cheaper and made with a Pico 2 and a level shifter you can buy on any electronics/makers store. If you take this approach, let me know if it works on the SE/30 (and submit a patch if possible/needed)! Regards, Miguel Arroz | |
| Posted by: ereuter on 2026-05-11 02:49:58 Thanks, Miguel. It will be a while before I can try this, but I will report back. This looks like it might be the right solution. Nice work! | |
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