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nickpunt

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  1. nickpunt

    Orange Micro NuBus PC Card - Need Help

    Ok so VGA and VRAM is on-board. Am I right in assuming the visual artifacts are likely VRAM related then? I've read about something like this happening before from other vintage hardware, but want to isolate the problem best I can before I go looking for new chips & someone to fix it. Thanks!
  2. nickpunt

    Orange Micro NuBus PC Card - Need Help

    Same issue with the original 486dx2-66 (the solitaire image was from that). Interesting I didn't realize it used internal video but that makes sense.. I figured the two large chips to the bottom right of the 486 were VRAM but I guess they're the 128k cache the card comes with. Sounds like I should swap back in the dx2 and see if the A20 error comes up again. I can also swap the RAM, haven't tried that. Any other ideas?
  3. nickpunt

    Orange Micro NuBus PC Card - Need Help

    Necro'ing this thread for a related question. I've got the same card (OrangePC 290) and I'm seeing visual artifacts appear soon after opening any program with graphics (e.g. Windows 3.1, Simcity). My guess is this is a VRAM issue, but I haven't stress tested this card to know if this happens after a while in DOS as well. Any ideas? Would I have to resolder new VRAM chips on? Note on the 'A20 Hardware Error', I think that's from swapping in a 486 overdrive instead of 486dx2-66 rather than the video issue, but that's just a guess.
  4. nickpunt

    Modern PSU for the SE/30

    Looks great @JDW, thanks for the thorough walkthrough!
  5. nickpunt

    Multiprocessor SE/30!

    @Gorgonops this reminds me of something I read the other day about the 040 and the 68882: https://en.wikipedia.org/wiki/Motorola_68040 Unfortunately, the 68040 ran into the transistor budget limit early in design. While the MMU did not take many transistors—indeed, having it on the same die as the CPU actually saved on transistors—the FPU certainly did. Motorola's 68882 external FPU was known as a very high performance unit and Motorola did not wish to risk integrators using the "LC" version with a 68882 instead of the more profitable full "RC" unit. (For information on Motorola's multiprocessing model with the 680x0 series, see Motorola 68020.) The FPU in the 68040 was thus made incapable of IEEE transcendental functions, which had been supported by both the 68881 and 68882 and were used by the popular fractal generating software of the time and little else. The Motorola floating point support package (FPSP) emulated these instructions in software under interrupt. As this was an exception handler, heavy use of the transcendental functions caused severe performance penalties.
  6. nickpunt

    Multiprocessor SE/30!

    @Von the first photo is just a joke, it's a Turbo040 -> daystar IIcx adapter (fake) plugged into -> socketed daystar board. And then another daystar 030 accelerator -> micromac PDS adapter -> MacCon. I tried for maximal ridiculousness @Gorgonops this is what I was thinking - the socketed daystar just works without any drivers or anything. 030 accelerators don't seem to modify the ROM in any way (hence they can use the ROMinator II no problem). Any non-030 accelerators both modify the ROM and have some degree of software control, and there's precedent to having software disable accelerators entirely. MicroMac Carrera040 has a control panel with a switch to turn it to 'slow' which disabled the processor. In the FAQ, they state: Q: I currently have a FPU installed, can I still use this FPU once I installed the Accelerator? A: No, once the Accelerator is active, it will disable the CPU and the FPU you have on your logic board. Turbo601 as @Von points out can be disabled. Turbo040 has Daystar QuadControl you can disable application caching, PowerMath, Secondary Cache Control. Maybe all of those together would potentially just disable the accelerator entirely? Sometimes software is written in a way that doesn't explain its exact function, and QuadControl's options might be one of these situations. One interesting thing is that there's different software for 030 and 040 daystar accelerators. The 030 uses PowerCentral, while the 040 uses QuadControl. PowerCentral has two on/off switches for cache and FPU: This doesn't suggest the accelerator CPU can be disabled. In the case of the socketed SE/30 powercache, that would lead to not having a CPU at all, so probably a good idea not to have that option Order of operations 1. Electrical - can they be plugged in together without magic smoke? 2. CPU Bus - does the computer know which CPU to send stuff to? 3. Drivers - is it possible to change options in the 040 such that disabling those will fall back to the 030? #1 my guess is it won't make smoke. #2 seems kind of suspect. but, given only the 040 is modifying the ROM, it may mean its pointing to the 040 first. #3 raises the question whether disabling the 040 FPU/cache falls back to the PowerCache 50mhz FPU/cache, or simply disabling both accelerators FPU/cache. Probably depends how the control panels are written. In fact, the computer may refuse to boot simply if you have both QuadControl and PowerCentral active. But I'm still hesitant to run the experiment
  7. nickpunt

    Multiprocessor SE/30!

    "Scientists were so preoccupied with whether they or not they could, they didn't stop to think if they should" In all seriousness though, has anyone ever attempted to put two accelerators in an SE/30? For example, a socketed powercache and a turbo 68040: I have no particular desire to be the first to attempt it as I don't want to see two extremely valuable parts go up in smoke, but my understanding is the Turbo040 can be enabled / disabled in software, so if this configuration worked electrically & in drivers, you could have the best of both worlds in software compatibility, given some software works better on 030s than 040s. My guess is daystar software would be rather confused by this whole arrangement, but who knows?
  8. nickpunt

    Modern PSU for the SE/30

    I wouldn't trust myself to build this successfully but if someone were doing the project and wanted to make an extra seasonic one, I'd be happy to pay for time + materials for one!
  9. nickpunt

    Wifi Extension Development Thread

    There's also the Cloud 7 control panel from bbraun that lets you mount an HTTP disk. For future-proofing, HTTP web hosting is probably better than AFP-based NAS sharing, since Apple has stopped working on AFP and it's being deprecated in favor of SMB. Thus I'm not sure how much longer NAS drives will support AFP. I haven't tried Cloud 7 yet but it looks very useful, only concern I have is on the web server side how to host these old Mac files with resource forks. It also leaves open the possibility of having a shared address where we can all access common software, rather than each of us roll our own solution. http://www.synack.net/~bbraun/68khttpdisk.html A nice user experience idea might be to combine this with the wifi extension to attempt to automatically mount a drive upon wifi connection. That'd be neat
  10. nickpunt

    LC630 - same PSU as PM6200?

    Related question: just bought a 6360 in part because I wanted to swap my 640dos board in. Sounds like I messed up and that’s not possible... I knew something was fishy with 5v vs 3.3v stuff. Would it be doable if I just got a different psu or do you think I need a whole other enclosure? Thanks
  11. nickpunt

    Wifi Extension Development Thread

    Is it possible to use something more standard like a Raspberry Pi as a bridge? They're high quality, cheap, and likely to be supported for a long time. They could also convert HTTPS traffic to HTTP, or do web rendering with static images to make the web browsable on old systems (https://virtuallyfun.com/wordpress/2014/03/11/web-rendering-proxy-update/). OpenWRT exists for the pi as well: https://wiki.openwrt.org/toh/raspberry_pi_foundation/raspberry_pi Not sure if it supports correct speed/duplex for old 10bt cards though. As a broader point, there's a lot of one-off hardware to manage the variety of connectivity needs for old Macs, and it makes me wonder if there's a more general purpose way to go about solving these problems. RPi's have USB, BT, Wifi, and GPIO and are extremely well supported on the software side.
  12. nickpunt

    SMDs missing from of Daystar PowerCache P33

    This help?
  13. nickpunt

    Radius RocketNozzle - Backplane Exhaust Cooler

    They’re about $60 on eBay these days. Not sure about the rest, haven’t oc’d anything yet. Makes sense to have a bit more cooling.
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