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Re: Repairing EDID info on a Viewsonic PF790

Posted on 2022-04-06, 06:50

in Marvin \ Video
EDID is normally housed in a small i2c rom. You can try to find that chip and reflash it. Or you can try to intercept the ddc wires and have a microcontroller fake things (which is what some hdmi edid emulators do). DDC/EDID is a comparatively new standard. It only appeared during the time PCI …

Re: PowerVR Fun Thread

Posted on 2022-03-30, 15:10

in Marvin \ Video
Now the N8xx graphics architecture was a bit bizarre: OMAP2 graphics hardware could not contain the full 800x480 framebuffer (this was when 320x480 iPhone was "revolutionary"). ... I have to admit, that entire experience left me very bitter about GPUs overall. 10 year younger me would have assumed …

Re: PowerVR Fun Thread

Posted on 2022-03-30, 10:21

in Marvin \ Video
I'm the guy who did the arm mali gpu reverse engineering and who started the whole open source drivers for arm movement (and modesetting, and the free ati driver, and ...). From the start, i planned for IMG to be singled out, and provided the reasons for doing so. If you hear or heard anyone state, …

Re: Retro GPU with true digital DVI output?

Posted on 2022-03-20, 10:39

in Marvin \ Video
I guess I was led off the mark by this old thread: https://www.vogons.org/viewtopic.php?t=24367 the problem is that the video signal from the DVI is general very poor because its goes through the RAMDAC and then to the SiliconImage Chip to get Digitalized again. like on most other cards from this …

Re: PowerVR Fun Thread

Posted on 2022-01-26, 20:14

in Marvin \ Video
There is no PowerVR version of Q3. What's going on in this thread is stock Q3 being played with separately available supplemental MiniGL drivers for the Neon250. There's no source code publicly available for any of the established PowerVR MiniGL drivers (extreme, neon250, techland) Hrm. I see. And …

Re: Oldest cards that support HDMI

Posted on 2021-08-19, 19:37

in Marvin \ Video
Single Link DVI has a dotclock of 165MHz, iirc capable of 1900x1200 at reduced blanking. The linux command line tool cvt (which i wrote) confirms: Modeline "1904x1200R" 152.75 1904 1952 1984 2064 1200 1203 1213 1235 +hsync -vsync UHD (3840x2160), at reduced timing, would require 533MHz, although i …

Re: Oldest cards that support HDMI

Posted on 2021-08-19, 19:28

in Marvin \ Video
Actual HDMI would be a Radeon X1600/X1650 (R5xx) Comes with an external HDMI encoder. Can be had as both AGP and PCIe. R600 (HD2xxx) came with native HDMI. Again, both AGP and PCIe available. -- The guy who wrote the bulk of the original open source linux driver for R5xx/R6xx.

Re: ASUS EAH4650 Radeon HD 4650 BIOS DUMP

Posted on 2021-08-07, 14:42

in Marvin \ Video
Does GPU-Z dump from SPI, from the pci bar, or from 0xC:0000? SPI is not likely, as i REed it from scratch a few years ago, and almost no-one picked up on it. As for the PCI BAR: ATI, in its infinite wisdom, disabled reading from the PCI BAR through some magic register (that ATI of course did not …

Re: ASUS EAH4650 Radeon HD 4650 BIOS DUMP

Posted on 2021-08-06, 12:20

in Marvin \ Video
While i cannot provide you with a BIOS valid for this exact board, i can point you to some tools to help with this: Linux flashing tool flashrom adjusted for ATI: https://github.com/libv/flashrom/tree/ati AtomBIOS disassembly tool: https://cgit.freedesktop.org/~mhopf/AtomDis/ in case you wish to …

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