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  2. With all that said, I'm curious to see whether you can distill what you think the problem is. And, don't just list a bunch of 75Hz video modes, because LCD monitors do fine at 75Hz, they do fine with 832x624 and 1152x870, and most of the Macs that can output those resolutions can go down to 60Hz anyway. Is there a particular video card that can't? Why can't that video card just be replaced with one that can? (You linked to the 24AC video card above, which is a multiscan video card and will be able to do the 60Hz output version of every resolution it can do, just as a Quadra or Power Mac's onboard video can.) As the CRTs all die out, I think that it's just going to be a reality that we aren't going to get 640x870 portrait display mode. Possibly, if so, you've managed to say in a single sentence what I haven't been able to extract out of five or six posts. If this is true, then my suggestion here is that using those video cards is likely going to have to die along with those displays. It seems to me like the better solution in this scenario is to replace those video cards with something a little more generic, that was itself multisync, such as the cited 24AC video card, or the hypothetical NuBus HDMI output video card that has been discussed. Both are also solutions for systems like the IIci (and IIsi?) that didn't originally allow for a "VGA" mode -- but, again, I'm reasonably sure most midrange business LCDs will accept that signal with no trouble. I should dig out my IIsi and give it a whirl with my P1914S and my U1504FP. In the case of the IIci/IIsi in particular, where 640x480 is very close to the to the top capability of the video system, the OSSC seems relevant, especially if someone has a display that for some reason doesn't accept 67Hz input. My question is, what's cheaper: 135 Euro (excl. VAT) for the OSSC or $120USD for a brand new display that will work. (At worst, there's the 'Elite' version for $160, which also includes a USB hub and DVI and DisplayPort connectivity, but I suspect the basic version will work.) /// Of course, we could also do what the video game people are doing and maintain+repair the CRTs we have, but I know that shipping CRTs around and finding someone willing to repair them and then either funding it well enough that that person can do it professionally or not burning them out by surrounding them with people's semi-broken CRTs while they work a regular job is going to be tough to do.
  3. So far as I'm aware (most?) regular LCD monitors/TVs refresh their LCDs at the same rate as the input so the only circumstances under which tearing or judder would appear would be with a buffering converter. You certainly wouldn't see it with the OSSC since its whole selling point is there's no buffering, it's designed with minimizing any and all lag as the primary success criteria. Here's an example of an FPGA-driven converter targeting oldschool system that does frame-rate conversion: https://www.serdashop.com/MCE2VGA It uses the oft-forgotten 400 lines@70hz timings that the original VGA cards used for text and EGA high-res modes. The modes it's using this to display were originally at 50 or 60hz. It apparently produces very pretty output, but even it gets trashed by that certain subset of gamers that obsesses about *any* delays or video artifacts, even ones that the human eye really can't readily pick out or only become apparent in certain edge cases. (Diagonal scrolling of playfields, etc.) I think the main sticking point here is that what's desired is some magic glue that will work with *any* old Mac video card, including obscure high-end ones that came out of the box pre-configured to work with *very* specific monitors. It's not an *impossible* ask, but it may be a product with a target market measured in the single digits. (Frankly if your interest is running ancient productivity software that benefits from massive pixel counts you'd be far better off running that on a newer computer than the original 68k platform. Unlike games most of that stuff is decently tolerant of running either on a newer Power Mac with more-modern video hardware or fully in emulation.)
  4. They're still being made TODAY, except, now, with LEDs. For example: https://store.hp.com/us/en/pdp/hp-prodisplay-p17a-17-inch-5:4-led-backlit-monitor-(energy-star) (disclaimer: I haven't used this particular display personally, I have a Dell 19-incher from 2014, with most of the same feature-set) The supply of vintage Macs will dry up before the supply of these displays does. Like I said, the majority of vintage Macs (even the majority of modular 68k Macs) will output in a format even relatively cheap TVs can handle. The two modular Macs that are currently in a questionable state on this front can have a nubus display adapter installed. This is largely a solved problem.
  5. ktkm

    Daystar Universal PowerCache P33 in SE/30

    Is it possible to buy a PDS flat cable for the DIN-connector?
  6. Is the PowerBook 165 adapter equivalent to the Macintosh Portable adapter and vice versa?
  7. Today
  8. Bugs fixed: -one-off errors at octave detection -one-off errors at note detection -proper accidentals management Here's a quick demo of a chromatic scale in C major, followed by a major and then minor arpeggios. It's played in Studio Session itself first, then launched by my own program, SSPhase.
  9. ThisDoesNotCompute

    This Does Not Compute SE/30

    Thanks for sharing my video! I poked around the logic board a bit recently, and here's what I've found so far: --All voltages present (+/- 5v, +/- 12v) at the 14-pin connector from the analog board. --Continuity from the 14-pin connector to the edge connector for those voltage rails. --All voltages present at the external floppy drive connector...except for -12v. Hmm. Schematics show that cap C9 handles the -12v rail. It looks OK visually, but I might remove the new cap and take a closer look. RAM and ROM SIMMs have had their contacts cleaned (both on the SIMMs themselves and their connectors). Haven't started checking the ROM SIMM slot for continuity yet.
  10. The OSSC has applications on more modern systems as well. It supports sync-on-green, composite sync, and H+V sync sources, so it has utility in that area as well. The scaler function can be disabled if one wants 1:1 output on the digital side. Regarding refresh rates, the "mismatch" is rarely a problem with displays. You won't get judder/tearing from the mismatch (67hz into a 60hz native display) simply because a vintage mac can't output a solid 67 or 75 frames per second via its onboard video chip anyway (remember that this was the era of postage stamp sized 15fps video).
  11. BadGoldEagle

    Original Hackintoshy Thing

    I wonder if one of those cheap arcade 'CRT' adapters can be tweaked to support the Mac's built in video... I have an external adapter that uses the same connector/interface and it'd be neat to have my Mac Plus' screen projected on the wall or something... The adapter itself seems easily reverse-engineerable. Oh and BTW, nice find!
  12. Franklinstein

    Original Hackintoshy Thing

    That floppy drive is certainly interesting. Fujitsu never built GCR floppy drives for Apple. Maybe they were intended to be used in 3rd party external units, of which I have seen a few examples using non-Sony drives. Epson made some, too, for sure used by Outbound in their Notebook clone series. If you don’t already have a buyer lined up for your ATS hack-a-Mac, consider dropping a post in the Trading Post. I’d be interested, for sure.
  13. There isn't any way to do what you're describing because, think about it: a gate valve controls *pressure*, which is roughly analogous to voltage. The electronic analog is a simple resistor. The problem here is *frequency*, IE, we need to reduce the number of phase transitions per second for an output relative to its input without losing any data except for discrete packets we choose to throw out. There's no way to do that I can think of without a "memory", and further I'm having trouble thinking of any analog memory systems (like, I dunno, mercury delay lines) that allow the output to be " clocked" at a different rate than the input.
  14. Agreed, somewhat disappointed at that, but I'll agree. That feels like too much of an oversimplification of what I was trying to say. The video signal is a stream of those values as you describe, each right on the dot clock. Gate valving the higher frequency stream of the first four frames to match the display's expected input over four consecutive frames keeps that stream steady. The fifth frame gets dropped when it's time to draw the first of the next four frames and so on. IOW, you're analog-ishly retarding each and every pixel signal to match phases over four full scanline sequences and then jumping to the sixth scanline sequence of the input to start the first frame of the next four on the display end as there is no time remaining for that fifth frame to be drawn/converter/whatever? That's muddy as all get out as well, maybe it's backwards? edit: a gate valve is used to lower fire hydrant water pressure levels to garden hose water pressure levels. 75FPS being the hydrant and 60FPS being the garden hose.
  15. You don't need to go on and on about it. Ugly business grade multisync panels are not yet in short supply, got it, enough already. We covered that way up at the top. One day, when those high hour LCDs fade away, we may well need such an active converter as all the CRTs will have perished as well. But need will come up no time soon, that's clear enough. This is an offhand technical discussion and very interesting in the details so far, more of a feasibility study, most certainly not a market study. I like my three big CRTs, they go with the collection. The UltraSharp's are convenient, but do not fit in with my collection outside of the G4/OS9 Graphics setup. Nor do the KDS/Radius Panels I've collected from the Nineties for that matter, but they do look a lot better than the Dells when I'm playing with one next to the IIfx and big Radius TPD. Active conversion to HDMI displays would be aimed at working Classic Macs into a primary workstation in the future where styling won't matter so much. Two or three Macs on a shelf, rotating in and out of the collection and sharing main display, keyboard and mouse would be handy for Classic Mac playtime. ATM a Dell Multisync (1600x1200 20") is the menu screen for my primary display and I can play with the IIsi that lives under the desk or any of several other Macs in rotation on it.
  16. Gorgonops

    Original Hackintoshy Thing

    Interesting. Googling the model number of that drive indicates that it is a factory-built Fujitsu clone of an Apple drive. Didn't know such an animal existed.
  17. I guess one could test that by observing if there is HD access after the chime. I’m guessing not, though.
  18. Have you tried a video card with the 601? Since you get a chime it sounds to me like the onboard video might not be ppc compatible.
  19. YMAC

    Original Hackintoshy Thing

    Here are some detailed shots of the floppy. Super busy right now, I will follow up with more as time allows. I wish I could remember more, but I think it is a standard floppy.
  20. Thanks @TPope yes it appears the elusive IIsi PDS adapter is the missing piece of the puzzle. I'd love to know what this adapter does that the Twinspark doesn't! I'd also like to see at least some shred of evidence that anybody has ever got a 601 working in their SE/30? I know it'd been mentioned online a few times, but never with photographic proof
  21. Hey Ant, I assume you know that the Daystar 601 for 68030 computers requires specific ROM chips, (si or fx) the si PDS adapter and software. The software is an extension and maybe a control panel. I've never seen it just read about them. It makes sense cause you need software to run Daystar's 040 upgrade cards. I have forgotten where I saw that but maybe Macintoshgarden or Lowendmac can help. I will keep researching and will let you know what I find. Peace
  22. Yesterday
  23. For the most part I basically agree that this is a solution looking for a problem. While it's true there are individual edge cases where you might be stuck looking at a video output that's genuinely difficult to find a modern monitor work with (IE, mono portrait or two-pages display cards, really old Mac cards that only support composite sync, etc) *most* Macs will work at least begrudgingly with decent "pro-grade" LCD monitors that aren't that hard to find. Even with many of the hard cases (TTL or ECL two-page-er's) it's possible to fudge it with solutions like resistor-ladder DACs that fall well short of full timeshifting scalers; the only requirement is, again, you will probably be stuck using an older "Pro-grade" monitor instead of a cheap TV with a VGA port. The one thing the world probably could use is a hobbyist-priced sync-on-green separator for old Mac video cards that don't have separate TTL sync. (The 67hz bit really shouldn't be that big of a deal as long as you're willing turn over a few rocks for a monitor.) Here's a ridiculously expensive one. It should be possible to make one for considerably less than that because there exist dedicated sync-separator chips, it's just a little bit more complicated than slamming one chip on the line because those chips don't *strip* the sync off the green... But, well, quite a few LCDs that support non-VESA framerates also support Sync-on-Green, so maybe that's not even that big of a deal.
  24. I'm going to say it again. The monitors I'm talking about, midrange business LCD monitors from, if not all the way back to 1998, at least the early 2000s, up through at least 2017, support 75Hz input and display it well. I don't think that there's a need for what you're describing. You're making the already-not-always-clear concept of "VGA adapter" way more complicated than it has to be. The OSSC that @NJRoadfan mentioned already exists for gaming and certain 8-bit/non-mac vintage scenarios, but the Mac doesn't need that kind of treatment.
  25. You can't just "analog-ishly" pitch frames onto the floor to resolve frame-rate mismatches. Remember, what's being transferred in the video signal at any given moment in time is the color/intensity of a single pixel *somewhere* in the 2D grid that makes up the screen, and that feed is completely continuous. That moving dot of light *always* needs to move a continuous fixed speed, IE, the pixel clock, and that clock is different for the same video mode running at different frequencies. Outside of some very specific special cases (like simple "line doublers" to turn 240p into 480p) there's no getting around needing to buffer entire frames of video. Note about what I said about needing enough RAM to buffer 2 full frames; that's not necessarily true if you have dual-ported VRAM; in that case you can simply have the input scan repaint the pixels in the same buffer that's being referenced by the output scan. The downside to this approach is you *can* get tearing and other anomalous artifacts because your output will essentially always be a combination of two input frames. To understand this, imagine the output circuitry running at a 60hz frame rate starts sending an all-white frame, call it "Frame A" to the monitor. Shortly after it starts doing that input from the computer starts painting an *all black* frame, "Frame B" into the buffer. Because the input frame rate is 75hz the input scan passes the output scan halfway through the frame, and the moment it does the converter will no longer be outputting the white pixels from frame A, it'll be throwing out the black pixels from frame B, resulting in the monitor receiving a half white, half black frame that was never actually output from the computer. For most purposes (especially involving a simple GUI desktop) this isn't going to matter a whole lot, but it is technically a visual anomaly that might be perceptible under certain circumstances.
  26. supernova777

    PCI SATA card for Blue & White?

    the 6290m is exactly the same as the 6280m but with 2x sata ports instead of ATA connectors; unfortunately can only support 2 drives instead of the 4 supported by the ata version
  27. I have also used the 6280M with 7.6.1. It works just fine.
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