Seems like a really nice video card! But not for me because I want to use real CRTs.

Unless. Is it possible to support video capture later? Since it has USB. It would be really nice to capture emulated scanlines but any capture with correct (or upscaled) resolution and frame rate would do.

Someone will likely suggest HDMI capture device but I don't trust any cheap device anymore. So build-in capture support would be real nice feature.

aitotat wrote on 2026-10-31, 10:34:

(...)
Someone will likely suggest HDMI capture device but I don't trust any cheap device anymore. So build-in capture support would be real nice feature.

DreamBlaster will, of course, be the one who will give an authoritative answer about what is possible on the USB front. That being said, in the meantime, if I may make what I believe is a reasonable guess , the USB controller on the RP2350 is USB 1.1, unless I am mistaken, so, even handling CGA at 320x200 in 2-bit color would seem like a stretch without real-time compression, let alone any higher color depth and/or higher resolution modes. And that is assuming there are even enough free CPU resources to theoretically allow for this.

As for decent capture devices, a used Datapath VisionRGB E1S (PCIE) is probably the best option for quality VGA and DVI/HDMI capture in full RGB (no subsampling). It used to be possible to get inexpensive ones for around 100 to 150 US$, AFAICR.

On the USB front, the Elgato Camlink 4K (DVI/HDMI capture only), might work well enough, despite it being limited to YUV422 (subsampling) processing internally. In general terms, when capturing RGB input, this can be alleviated practically entirely if the video mode captured is line doubled before being fed into the Camlink 4K's HDMI input. Depending on the output resolution (line doubling/multiplication) options available on the SerdaVision, the YUV422 limitation of the Camlink 4K may not be an issue at all. Again, Dreamblaster would be the one to ask about HDMI output options (maybe they are already published somewhere and I missed that), but I suspect that at least the lower resolutions are always linedoubled on output for HDMI/DVI compatibility reasons. EDIT: Based on [2], output can be line doubled or upscaled to higher resolution on output gor most supported modes. You will find some stills of Camlink 4K captures here [1] and likely elsewhere in the same thread, as well as E1S capture stills.

[1]
Re: VGA Capture Thread

[2]
From the specs

1Output: HDMI or DVI, 640x480 at 60/70 Hz, 800x600 at 56 Hz; analog VGA via a powered HDMI2VGA dongle

EDITS: Corrected many typos. I need to sleep more. Added a reference about output modes and subsampling.

yes i think using hdmi capture device is the best option
usb has not not enough throughput

I am very excited about this project. The concept is even something I posted about, with crickets response: Fast microcontrollers as modern "implementations" of various components of retro PCs?

We are inching closer to being able to build a DOS PC using only newly manufactured components.

Have you considered other forms of digital output — for example, eDP for a laptop display?

Bit the bullet and pre-ordered one.

EDIT: Anyone one know of an FPGA or microcontroller-based x86 CPU and motherboard combo with actual ISA slots ?

EDIT2: It had been too long since I had ordered something from Serdashop. This nice little item drew me back in. Merci/Bedankt, Serge!

keenmaster486 wrote on 2026-10-31, 14:36:

Have you considered other forms of digital output — for example, eDP for a laptop display?

What the situation where you would have an ISA slot and eDP display? Custom project like conversion of a device with a broken screen to a modern display?

darry wrote on 2026-10-31, 19:52:

EDIT: Anyone one know of an FPGA or microcontroller-based x86 CPU and motherboard combo with actual ISA slots ?

This is exactly what I'd like to know as well.

You might want to take a look at this guy's page: https://github.com/rodneyknaap?tab=repositories

I think he still uses some NOS ICs in his designs though, but he seems to be trying to migrate away from that.

NeoG_ wrote:

What the situation where you would have an ISA slot and eDP display? Custom project like conversion of a device with a broken screen to a modern display?

That could be one, but I was thinking of some kind of custom XT or AT laptop build using all new components.

keenmaster486 wrote on 2026-10-31, 22:18:

This is exactly what I'd like to know as well. […]
Show full quote

darry wrote on 2026-10-31, 19:52:

EDIT: Anyone one know of an FPGA or microcontroller-based x86 CPU and motherboard combo with actual ISA slots ?

This is exactly what I'd like to know as well.

You might want to take a look at this guy's page: https://github.com/rodneyknaap?tab=repositories

I think he still uses some NOS ICs in his designs though, but he seems to be trying to migrate away from that.

NeoG_ wrote:

What the situation where you would have an ISA slot and eDP display? Custom project like conversion of a device with a broken screen to a modern display?

That could be one, but I was thinking of some kind of custom XT or AT laptop build using all new components.

Is there a documented way to wire an ISA backplane into a MiSTer setup or even to a Raspberry Pi ?

EDIT: I will likely start a thread on that theme if/when I got closer to something concrete.

keenmaster486 wrote on 2026-10-31, 14:36:

I am very excited about this project. The concept is even something I posted about, with crickets response: Fast microcontrollers as modern "implementations" of various components of retro PCs?

We are inching closer to being able to build a DOS PC using only newly manufactured components.

Have you considered other forms of digital output — for example, eDP for a laptop display?

how would this be used?

Low height bracket for Serdavision also ready :

I will add it to the options at https://serdashop.com/products/serdavision-hdmi

will be shipping out the first few cards after the weekend (will include half size bracket as extra in all pre-orders up until now that i added this option)

dreamblaster wrote on 2026-11-01, 13:29:

Low height bracket for Serdavision also ready : […]
Show full quote

Low height bracket for Serdavision also ready :

The attachment halfsizebracket_serdavision.jpg is no longer available

I will add it to the options at https://serdashop.com/products/serdavision-hdmi

will be shipping out the first few cards after the weekend (will include half size bracket as extra in all pre-orders up until now that i added this option)

Cool, thank you.

I hope sales are good.

Firmware v1.00 for Serdavision HDMI is now ready , all tests fine on my PC's, i will be releasing.
available here : https://serdashop.com/products/serdavision-hdmi
First boards will ship on Monday, a larger batch will be ready for shipping in about 2 weeks. I will keep the 'pre-order' label on there for now

dreamblaster wrote on 2026-11-01, 06:23:

keenmaster486 wrote on 2026-10-31, 14:36:

Have you considered other forms of digital output — for example, eDP for a laptop display?

how would this be used?

Imagine a project like the Book 386 or Book 8088, except refined, with a much nicer experience overall, and a design that doesn't have to rely on NOS parts.

7 boards ready for the first shipments (just need to complete bracket printing - i will mount full height bracket on each card, and include low profile bracket as extra)

Probably the most useless question about the monitor : when is it TOO big to be enjoyable ?

I now have an EIZO 19" 4:3 monitor, perfect. With this new card, I'd like to try 24" or maybe 32".

Tesla wrote on Yesterday, 09:28:

Probably the most useless question about the monitor : when is it TOO big to be enjoyable ?

I now have an EIZO 19" 4:3 monitor, perfect. With this new card, I'd like to try 24" or maybe 32".

Before I got a retro system I played ms-dos games on my 100" projector with dosbox, it was fine

NeoG_ wrote on Yesterday, 09:31:

Tesla wrote on Yesterday, 09:28:

Probably the most useless question about the monitor : when is it TOO big to be enjoyable ?

I now have an EIZO 19" 4:3 monitor, perfect. With this new card, I'd like to try 24" or maybe 32".

Before I got a retro system I played ms-dos games on my 100" projector with dosbox, it was fine

.... oh

Hi,

very interesting project!

dreamblaster wrote on 2026-10-26, 19:40:

• Output: HDMI, 640x480 at 60/70 Hz, 800x600 at 56 Hz; analog VGA via a powered HDMI2VGA dongle

Will it also be able to output the native resolutions, for example 720x350 and/or 720x348 at roughly 50 Hz for Hercules cards, or just the mentioned resolutions? TIA!

KVM Nerd wrote on Yesterday, 15:20:

Will it also be able to output the native resolutions, for example 720x350 and/or 720x348 at roughly 50 Hz for Hercules cards, or just the mentioned resolutions? TIA!

No. The card always sends one of the resolutions listed. Hercules, MDA and InColor go out as 720x480 at 60 Hz, with the 350 or 348 lines shown 1:1 and centred. If you want the full height, SVSET /V:FILL stretches them by repeating lines.

720x350 at about 50 Hz isn’t possible over HDMI: its pixel clock (about 16 MHz) is below the 25 MHz minimum for HDMI/DVI, and most screens wouldn’t accept it anyway. Programs never notice the 60 Hz, because they see the card’s own retrace.

dreamblaster wrote on Yesterday, 20:42:

KVM Nerd wrote on Yesterday, 15:20:

Will it also be able to output the native resolutions, for example 720x350 and/or 720x348 at roughly 50 Hz for Hercules cards, or just the mentioned resolutions? TIA!

No. The card always sends one of the resolutions listed. Hercules, MDA and InColor go out as 720x480 at 60 Hz, with the 350 or 348 lines shown 1:1 and centred. If you want the full height, SVSET /V:FILL stretches them by repeating lines.

720x350 at about 50 Hz isn’t possible over HDMI: its pixel clock (about 16 MHz) is below the 25 MHz minimum for HDMI/DVI, and most screens wouldn’t accept it anyway. Programs never notice the 60 Hz, because they see the card’s own retrace.

As an optional functionality, configurable line multiplication, if possible, would be very nice.

Would it be possible to line double 720x350 --> 1440x700 ( doubling the pixel clock into >25MHz range) and preserving 50Hz output?

Actually, that might be useful for all other supported modes such as 640x480 --> 1280x960 .

If I understand correctly, 320x200 modes are line doubled to 640x400 and then either letterboxed to 640x480 for output or stretched vertically vertically to a full 640x480 picture size, depending on the /V:x setting's value [1] . Alternatively, optionally line quadrupling them to 1280x800, if feasible, would be convenient too.

The main advantage of doing this, other than staying above 25MHz for the pixel clock, would to minimize the amount of scaling done by the monitor and maintain sharpness that might otherwise be lost due to the monitor's scaling algorithm.

I know it's likely an even taller order, but being able to manually tweak timings per mode (i.e. modelines) would really nice too.

Regardless, even if any of this is impossible, impractical, would require too much effort to be feasible or would possibly be of interest to almost nobody (except me), I will be happy to enjoy it as it is.

[1]
Vertical. LINES shows the lines as they are, centred. FILL stretches every mode
over the whole screen height, the way the original monitors filled their 4:3 tubes — a
320x200 game gets its 4:3 shape back