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Re: Can a faster ISA Graphics card be built?

Posted on 2024-04-07, 20:40

in Marvin \ Video
If you look at the benchmarks at https://www.vgamuseum.info/index.php/benchmarks , you can see that the ISA graphics cards plateau to a max cap quite noticeably: diag_graphics_mbs.png quake_320x240.png These best ISA graphics cards (and motherboards) had perfected the minimum number of ISA bus …

Re: IRQ9 on Graphics card? Yes or no?

Posted on 2024-03-23, 15:52

in Marvin \ Video
The vsync interrupt (originally on IRQ2, and then later demoted to chained IRQ9 iirc) quickly became obsolete after it first appeared in EGA, and most VGA adapters do not implement it. Many games use video effects that require synchronization to the vertical blank and/or the vertical sync (both are …

Re: Texture filtering - yay or nay?

Posted on 2024-03-14, 12:31

in Marvin \ Video
Yeah, texture filtering can definitely be used to an artistic effect. In early PC games it was a globally applied video config setting because different graphics cards might have steep performance implications to using different filtering and mip rules. In later hardware the point-vs-linear …

Re: Best IPS (if any) monitor for retrogaming

Posted on 2024-02-21, 11:18

in Marvin \ Video
BTW, the CRT Terminator Digital VGA Feature Card ISA DV1000 looks really nice, but as it requires an ISA or VLB graphics card (AFAIU, please correct me if I am wrong), it is not something that I could use with the systems that I currently have. Oh good point on bringing up this one. After the …

Re: Best IPS (if any) monitor for retrogaming

Posted on 2024-02-20, 22:19

in Marvin \ Video
I have the same Philips 252B9 :D Indeed, I also noticed that it does have a forced 4:3 mode. For the VGA input side, that is definitely super useful. Comparing these two displays, there are a few things that make me feel annoyed about the Philips display, and prefer Asus PA248QV more (when using it …

Re: Ram Expansion for S3 Virge PCI Card

Posted on 2024-02-20, 12:46

in Marvin \ Video
In DOS there's basically nothing out there that uses more than 800x600@8b, which needs less than 1MB. Adding more will not change anything. Tomb Raider in S3D mode runs at 640x480x16bpp and will benefit from 4MB. Not sure how much performance will improve, but you do get a bit more detail with 4MB, …

Re: Integrated Trident TVGA 9440AGi Memory expansion

Posted on 2024-02-20, 10:50

in Marvin \ Video
The picture above the text "Tvga9440 and its "iDE" Memory expansion." in the first post with the 2x25 pin male pin ribbon header is definitely not a VESA Feature Connector at least. They possibly have had some kind of proprietary RAM expansion card mechanism? That was popular with some manufacturers …

Re: Ram Expansion for S3 Virge PCI Card

Posted on 2024-02-20, 10:02

in Marvin \ Video
I taught more ram equals more speed xD also why is that an option if it aint gonna make it better.. ? Btw, even on modern PCs, if you have a 2 memory channel system and you add 4 sticks of RAM, then it will limit the max bandwidth of the system. It is a common problem that people get that their …

Re: Ram Expansion for S3 Virge PCI Card

Posted on 2024-02-20, 09:57

in Marvin \ Video
To simplify, like CoffeeOne mentions, the extra chips will be wired "in series" rather than "in parallel", so there won't be extra memory bandwidth available to the card even if you add more RAM. I have a S3 ViRGE ST-325A that has 4MB of RAM: S3_ViRGE_ST-325A.jpg It supports the following VESA …

Re: Best IPS (if any) monitor for retrogaming

Posted on 2024-02-18, 09:10

in Marvin \ Video
As part of developing https://www.vogons.org/viewtopic.php?f=24&t=92512 , I have acquired the following test displays in my lab: Fujitsu-Siemens P19-1 YEGA519530 (March 2003) 1280x1024 TFT LCD Sony SDM-X73 (May 2004) 1280x1024 TFT LCD Dell 2007FPB (March 2006) 1600x1200 TFT LCD Dell 2007WFP (March …

Re: VGA behavior when V. Display End >= V. Retrace Start

Posted on 2024-02-16, 21:50

in Marvin \ Video
Here's what happens with the Ahead V5000B card: https://oummg.com/dump/AheadV5000B_VDETEST.mkv I wonder if the behavior you are seeing is related to DRAM refreshing? Maybe the refreshing logic is somehow dependent on vblank triggers, and when those get messed up, the video memory corrupts itself? …

Re: 720 x 400 graphics

Posted on 2024-02-16, 16:42

in Marvin \ Video
There are some SVGA adapters I know that have done 720x pixels graphics modes based on the text mode. - Wang Labs Chips & Technologies F82C452 from 1991 has a 720x400 16 colors graphics in mode 14h: 14.720x400-16c.png - Paradise PVGA1A-JK in 1990 has a 720x420 video mode in its VBIOS (mode 60h). …

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