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@micheledipaola thanks for the photos! You have finally confirmed the value of R22 for me at 220Ohm, which was the last component I hadn't been able to reverse engineer on the cache circuitry. The ICs around the cache are also confirmed to be what I thought they were (which I had assumed at this...

More updates on OrangePC shenanigans: Naming clarity: After digging around more in the resource fork of the OrangePC 3.8 application and looking at the decl ROM contents on my NuBus OrangePC cards, I have determined that the card with a 386sx/Cx486SLC and single ISA slot is just called the...

I dumped the EPROMs on both my 210/220 (card has 220 written on it, so that is what I'm calling it) and my card simply labeled "OrangePC" (Cx486SLC with one ISA slot) which I'm calling the "200". There really isn't anything in them besides some basic identification info, but I'll upload them...

I have determined that Serial/Parallel may also require an LT1141A. It looks like DigiKey does have these, but they are quite expensive (for a single IC). Then again, given what these OrangePC cards sell for these days, it is still quite an inexpensive upgrade. If your card is missing all...

I'm actually starting to think that my Am5x86 is somehow broken. I tried putting it back into a Houdini II DOS card that it was previously known working in and I can't get it to POST there either, regardless of cache settings. I think I'll try to get a 3.3V Am5x86 and test that once I install...

I have managed to reverse engineer how the potentially missing features of the 2xx series OrangePC cards work and have put together some DigiKey lists to help others add missing functionality to their non-290 cards: Cache PCMCIA. Additionally, requires a PCMCIA card cage and a CL-PD6710 for...

I have some more updates on my quest transform any 2xx series card into a 290: Thanks to @nickpunt , I was able to determine which resistors and capacitors are needed for adding serial/parallel. I have since broken up my DigiKey list into separate ones for each piece of potentially missing...

I am running my tests in a Quadra 650 overclocked to 40MHz. I can confirm that full screen video is kind of bad in most cases. Sometimes, when launching an application, the color gets stuck in grayscale. Switching out of, then back in to fullscreen will make some applications appear in color and...

Thanks! This will definitely be helpful when trying to add the PCMCIA to my card. It also looks like most of the logic chips are populated under the PCMCIA card cage on your card? If so, serial/parallel really would just be a matter of adding the GoldStar Prime 2C (or compatible), the 24MHz...

I got the cache working! After installing all of the components, initially the card completely failed to boot. After replacing the Am5x86 that I had installed in the board with an Intel 486 DX4, it would boot, but it threw an error message that the L2 cache was "BAD" and was being disabled. I...

As far as I can tell, the 8*24 GC and SuperMac Thunder/24 will both only accept up to 4MB SIMMs. The SuperMac card will also only accept 2 4MB SIMMS, not 4. The RasterOps Horizon 24 (and possibly the PaintBoard Professional, but I haven't seen any definitive docs or card photos to prove it) is...

I tore my blueberry model down to replace the capacitors recently (too valuable to take a chance on 90s electrolytics IMO) and toned out the power cable while I was at it. It is center pin positive, if anyone wants to know. 24v and 45w appear to be the power requirements.

Have you ever run any speedometer tests with this card? Because of how different the main chip looks and the presence of a unique extension for the Paintboard Professional makes me wonder if it performs differently than the Horizon 24.

According to the RasterOps Horizon 24 manual, it technically supports up to 256MB of GWORLD memory. After toning out all of the lines on my own 1MB (4MB compatible PCB) SIMM, I came up with the attached pinout for the GWORLD SIMM. My SIMM has 8 256k x 8 DRAM chips on it in SOJ-26 packages. As...

Using a combination of more detailed photos and some excellent schematics of an OPTi 82C495XLC implementation, I believe that I was able to reverse engineer all of the optional components on 2xx series OrangePC cards. This effort should allow for upgrading any lower tier 2xx series card into the...

@jeremywork , these photos have been a great help, but I still can't read some of the chip labels and resistor values. I'm trying to see if I can populate the missing components on a lower tier 200 series card (210 in my case) and turn it into a full blown 290 model. My card is missing both the...

I recently bought a Quadra 650 that was sold "as-is, no power". The machine appeared to be in great condition, but upon taking the ASTEC AA15830 installed in it apart, I saw that most of the film caps were cracked and/or crumbling and one of them looked burnt. I decided to take a stab at...

In general, yes, I do believe that 24v should work just fine. It will allow the VRM to run cooler in most circumstances. There are two downsides though: The wattage consumed by things running on the higher voltage will not change. This will result in a larger amount of current flowing through...

I think it would also be cool to take something like this chassis mount PSU and make a 3D printed case for it for more of a stock look. That would be a lot more work, more expensive, and require mucking around with mains voltage... But it would be sexier than a plain black box.

I just found this PSU on DigiKey that should work great on a cube if you can make a cable (or are willing to harvest it from a stock PSU). It is rated for 240W and has enough connections to make hooking up the 4 wires easy. The voltage is slightly lower than stock at 27.6v, but I don't...