edingacic wrote:what you think of this = my friend has this going on .
https://photos.google.com/share/AF1QipM ... lFblNGeExn
czietz wrote:- The ET4000 is limited to 1 Meg of video memory, so even if you could clock it fast enough for 1366x768, you would be limited to 16 colors then. (I will try later on my ET4000 if it would accept such a video timing.)
czietz wrote:Some short comments because I'm a bit in a hurry right now:
- The ET4000's output is not interlaced. Where did you read otherwise?
- The ET4000 is limited to 1 Meg of video memory, so even if you could clock it fast enough for 1366x768, you would be limited to 16 colors then. (I will try later on my ET4000 if it would accept such a video timing.)
czietz wrote:- Not all software will run on third-party graphic cards.
Beetle wrote:Then there is the possibility to use a DVI-I to DVI-I/VGA cable (splitter cable) and have two
video outputs. Normally the Screen would be mirrored, but a hack makes it possible to have a
twice as large resolution and put one half on digital, the other half to analog output.
TOS does not know about that and just thinks it has a screen with up to 2048x1024 (two 4:3 1280x1024
screens) or even 3360x1050 (two 16:10 168x1050 screens) pixels of resolution.
Beetle wrote:Works in plain TOS+NVDI, with Magic or FreeMiNT. I see no problem running the new available
Geneva/NeoDesk system, too, its not yet tested, though
edingacic wrote:is this possible with TT also?
czietz wrote:OK, in terms of pixel clock, it is possible to do 1368x768 @ 65 Hz with an ET4000. I can also create such a video mode in Nova VDI. However, my monitor will recognize it as 1024x768 and it thus looks very blurry. This may very well be an issue with the monitor, though, e.g. it might think that everything with 768 lines is 1024x768.
On the other hand, I can now confirm that the ET4000 is not limited to 1024x768, because I have it running in my TT right now with 1280x800, 16 colors @ 65 Hz, non-interlaced, of course. That mode is recognized correctly by my monitor.
Foxie wrote:Interesting, I could have sworn I saw people talking about interlaced modes. Are all ET4000s equal in that regard? I know they made a few different versions over the years.
Foxie wrote: I imagine line A calls are out of the question too?
Foxie wrote:Thanks for doing the tests! This is good news, I think I already have a 1366x768 LCD somewhere, and they're certainly easier to find than 1024x768 LCDs. Are all the timings and pixel clock completely programmable through Nova VDI?
What resolution do you usually use? I assume you have a monitor with a suitable native resolution?
czietz wrote:- The ET4000's output is not interlaced. Where did you read otherwise?
czietz wrote:The Nova VDI comes with a Video Mode Generator that allows for very flexible configuration of the timing. You are of course restricted by the available video memory (1 MB for the ET4000, maybe more for the ET4000W32) and by the pixel clocks supported by the clock generator and the RAMDAC on the card. That's where ET4000-based graphic cards differ.
Foxie wrote: But as far as I understand, the ET4000 maxes out at 1024x768?
Foxie wrote:This is a bit of a problem. I could probably live with 1024x768 (though higher would be nice). But where on earth do I find an LCD with a 1024x768 native resolution?
Foxie wrote:So, what about the Mach32? I have heard there are Atari drivers, but I know much less about it than the ET4000. From my understanding, the Mach32 chip itself is capable of 1280x1024. Getting a 1280x1024 LCD is no problem at all. I don't know if it uses interlacing. But does the Atari driver allow selecting such a high resolution?
Foxie wrote:Frustratingly, the MIST supports a high resolution. It also has some decent speed. But the killer - it has no legacy ports at all. I need those for MIDI stuff. Without legacy ports I may as well use Hatari on a Raspberry Pi.
arf wrote:Yes: https://archive.org/details/bitsavers_t ... 0_11230195
arf wrote:"no at all" isn’t true, there are Joystick and optional MIDI ports.
arf wrote:Foxie wrote: But as far as I understand, the ET4000 maxes out at 1024x768?
Yes: https://archive.org/details/bitsavers_t ... 0_11230195
Foxie wrote:This seems to suggest the maximum pixel clock is 65MHz, so how is 1366x768 possible? (85MHz pixel clock?) Is it just a matter of taking it out of specification on cards which allow that? I assume the clock generator must be separate and completely programmable if that's possible.
Foxie wrote:Oh, so not all ET4000 cards have a RAMDAC capable of the same frequency? Is there a list anywhere of recommended cards with their maximum supported frequencies? Or is it a matter of looking up datasheets for the RAMDACs?
Foxie wrote:Maybe it's a safer bet to find a W32 card, being newer I would guess the RAMDAC would be faster?
Foxie wrote:I suppose the acceleration features built into the W32 aren't supported in Nova VDI? If not, I suppose one way of boosting performance could be to try and interface a VLB card to an accelerated Atari. I'd need to do some serious reading up about the 486 bus timings though! Though if the same chip is used on ISA and VLB cards, it might be possible to crank the ISA timings up. I think the Mach32 also has acceleration, but I've never heard of anybody talking about it on the Atari.
czietz wrote:You have to lookup the RAMDAC (and clock gen) anyway, because not all of them are supported by the Nova drivers. To give you an idea: I have four ET4000 cards. TwoThree work, one doesn't at all. One works but behaves erratically. So careful selection of the card is needed, anyway.
I don't know of a list of supported cards though. (EDIT: There are some pictures of cards on the Nova drivers page, https://silicon-heaven.org/atari/nova/, but they won't tell you the maximum pixel clock.)
czietz wrote:However, I think that some of the Mach's acceleration is in fact used by Nova VDI. Maybe someone with a Mach32 or Mach64 can help you here?
edingacic wrote:we really need some modern gfx interfaces that will be fast and cheap. i am also surprised that there is little interest in this. I would love a two monitor solution for my TT030 running Cubase or your future midi sequencer.
joska wrote:Correct, Nova Mach32/64 driver use hardware acceleration. The ATI-cards are a *lot* faster than ET4000.
Foxie wrote:The simplest hack would be to support three monochrome monitors on the R/G/B outputs, it should be so easy to do for someone who knows about VDI.
Foxie wrote:I also wonder if the Mach32/64 acceleration will work if interrupts are turned off (or perhaps just vertical blanking enabled). A sequencer might need to play around with interrupts to meet the necessary interrupt latency requirements.
joska wrote:1. Use it's bitplane mode. However, that would limit resolution to something like max 800x600 on each monitor, as each bitplane is only 64Kb.
2. Use 8/16 bits modes. Would work with any resolution supported by the card, but would also be very slow as each pixel written would require a read, logic operation and then write.
edingacic wrote:I have been trying for long to find out what is the best solution for TT030 and Cubase to run highest possible resolution in monochrome is totally fine and if there is a solution for dual screen mode?
edingacic wrote:I don't know if the scrolling on the screen is limited to CPU speed or Graphics redraw maybe someone can answer this?
Not owning a TT, I'm not entirely sure. It feels pretty quick in Hatari at 32MHz, but I think Hatari emulates a 32MHz bus which is probably faster than the TT bus. If the bottleneck is actually drawing to the screen (and assuming Cubase uses VDI), a Mach32/64 would probably provide a decent performance boost. If Cubase is spending lots of time "thinking" about what to draw, then you'll need a faster processor instead. Do you have any fast RAM fitted?
Speaking of scrolling, it would be nice to have scroll wheel support! Has anyone implemented it, I wonder? Not sure if it would work with Cubase because it doesn't seem to use much of GEM. I don't think Cubase has any way of scrolling windows using the keyboard?
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