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HDMI ISA graphics card for vintage PCs by improving the Graphics Gremlin

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Re: HDMI ISA graphics card for vintage PCs by improving the Graphics Gremlin

#4

Post by LeonM »

I've worked on something similar while in college. HDMI is actually a fairly simple protocol, based on VGA. It still has scanlines and such, but the signals are digital instead of analog. So instead of a RAMDAC, you have the HDMI encoder chip. You typically need control some i2c interface to set the HDMI encoder chip in the correct mode, but that's about it.

Re: HDMI ISA graphics card for vintage PCs by improving the Graphics Gremlin

#5

Post by jamesfmilne »

boffinAudio wrote: post #3

I imagine a PC with a Graphics Gremlin and either a Snark Barker or Snood Bloober for audio, is going to be quite the hipster toy to have, one of these days .. all this great old, retro, PC hardware designs!

Sounds well Jackson.

Re: HDMI ISA graphics card for vintage PCs by improving the Graphics Gremlin

#6

Post by LeoPanthera »

jamesfmilne wrote: post #5
boffinAudio wrote: post #3

I imagine a PC with a Graphics Gremlin and either a Snark Barker or Snood Bloober for audio, is going to be quite the hipster toy to have, one of these days .. all this great old, retro, PC hardware designs!

Sounds well Jackson.

I see that you are a self facilitating media node.

Re: HDMI ISA graphics card for vintage PCs by improving the Graphics Gremlin

#7

Post by unixhero »

LeonM wrote: post #4

I've worked on something similar while in college. HDMI is actually a fairly simple protocol, based on VGA. It still has scanlines and such, but the signals are digital instead of analog. So instead of a RAMDAC, you have the HDMI encoder chip. You typically need control some i2c interface to set the HDMI encoder chip in the correct mode, but that's about it.

I remember i2c support was added to the Linux kernel. I never understood what it is.

Next in line is BPF, which is also unclear.

Re: HDMI ISA graphics card for vintage PCs by improving the Graphics Gremlin

#8

Post by irdc »

unixhero wrote: post #7
LeonM wrote: post #4

I've worked on something similar while in college. HDMI is actually a fairly simple protocol, based on VGA. It still has scanlines and such, but the signals are digital instead of analog. So instead of a RAMDAC, you have the HDMI encoder chip. You typically need control some i2c interface to set the HDMI encoder chip in the correct mode, but that's about it.

I remember i2c support was added to the Linux kernel. I never understood what it is. Next in line is BPF, which is also unclear.

I2C is a simple serial communications protocol typically used for things like configuring on-board devices and reading sensors.

BPF is anything but simple.

Re: HDMI ISA graphics card for vintage PCs by improving the Graphics Gremlin

#9

Post by raverbashing »

LeonM wrote: post #4

I've worked on something similar while in college. HDMI is actually a fairly simple protocol, based on VGA. It still has scanlines and such, but the signals are digital instead of analog. So instead of a RAMDAC, you have the HDMI encoder chip. You typically need control some i2c interface to set the HDMI encoder chip in the correct mode, but that's about it.

i2c is also for EDID https://blog.danman.eu/emulating-hdmi-connection/

Re: HDMI ISA graphics card for vintage PCs by improving the Graphics Gremlin

#10

Post by waddup_ »

boffinAudio wrote: post #3

I imagine a PC with a Graphics Gremlin and either a Snark Barker or Snood Bloober for audio, is going to be quite the hipster toy to have, one of these days .. all this great old, retro, PC hardware designs!

I refuse to believe Snark Barker and Snood Bloober are real device names, what a funny time in computing that was.
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