Re: So just how does DMA on a 8088 based PC work?

Posted on 2021-12-02, 09:39

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

but can the DMA also do memory to memory transfers, which must use separate read and write cycles. http://www.os2museum.com/wp/the-danger-of-datasheets/ >IBM PC ... 8237 supports memory-to-memory transfers using DMA channels 0 and 1 (and only those). >inability to use separate page registers for …

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Re: Gotek like Optical Driver Emulator - Is it possible?

Posted on 2021-12-01, 08:11

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Were there ever any quadrophonic Audio CDs? You could send data using Audio Channel Control setting volume to unused channels 2 and 3 https://makbit.com/articles/mscdex.txt > Drives that don't support 4 output audio channels may ignore output to channels 2 and 3. or if you dont support variable …

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Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2021-12-01, 07:46

by

by rasz_pl

in Release Announcements

in Release Announcements

Any area that has a lot of moving platforms (eg. E2M3) destroys the FPS when it is in the player line-of-sight, as the CPU needs to calculate all of the platforms - this was on my 386SX-40. Any situation for where there's a lot of active monster AI (eg. HR2FINAL.WAD MAP32) will also destroy the FPS …

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Re: Unstable - P3 500, 512MB RAM, Vodoo Banshee and Radeon 9200

Posted on 2021-11-30, 09:40

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

is that one of those huge radiator with no fan DELL/HP cpus? those were cooled by the PSU fan, they need forced induction to operate within CPU thermal margins

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Re: Gotek like Optical Driver Emulator - Is it possible?

Posted on 2021-11-30, 05:01

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Or maybe it could simply become its own thing for the ISA bus ? Afterall not all CD-ROM drives were ATAPI. It could have a boot ROM for cd boot and a specific driver for DOS. This would be much more complex though IDE/ATAPI is the simplified cut down version of ISA bus. You just described …

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Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2021-11-28, 02:25

by

by rasz_pl

in Release Announcements

in Release Announcements

By shrinking rendered window you move around what part of codebase is actually stressed and % you post are non comparable to anything else, unless also measured at same settings and window size.

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Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2021-11-26, 23:58

by

by rasz_pl

in Release Announcements

in Release Announcements

ishadow wrote on 2021-11-26, 14:41: 386SX 25 MHz PC with Cirrus Logic 5402 SVGA ISA graphics. FPS jump from 21 to 25. wait, 20 fps on SX 25MHz? is that in post stamp sized window?

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Re: Retroquad - a Quake engine with the most advanced realtime 8-bit color software renderer on the planet.

Posted on 2021-11-23, 13:23

by

by rasz_pl

in Release Announcements

in Release Announcements

That's a lie. The whole rendering is done in 8-bit color. Retroquad has a number of color compiling routines that converts everything to 8-bit color data during load time. There's absolutely no truecolor rendering at all. There is no truecolor output, you render higher color precision with alpha …

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Re: M.2 NVMe working on old school regular pci

Posted on 2021-11-22, 20:36

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I encountered extremely bad transfer speeds it seems all the writes and reads had to be translated through the cpu because of the adaptation or something like that. I was literally getting kbps on older systems. And low mbps on newer hardware. My advice if you want to do this is as follows Use a …

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Re: Retroquad - a Quake engine with the most advanced realtime 8-bit color software renderer on the planet.

Posted on 2021-11-22, 19:26

by

by rasz_pl

in Release Announcements

in Release Announcements

>from low-end platforms how low end seeing you software render to 24/32bit before dithering down to 8bit palletized? 1GHz for playable 320x200? md5sum.exe C:\Users\me\Desktop\PAK0.PAK \5906e5998fc3d896ddaf5e6a62e03abb *PAK0.PAK Afaik you cant redistribute that outside whole shareware bundle, which …

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Re: FastDoom. A new Doom port for DOS, optimized to be as fast as possible for 386/486 personal computers!

Posted on 2021-11-19, 00:55

by

by rasz_pl

in Release Announcements

in Release Announcements

https://next-hack.com/index.php/2021/11/13/po … ooth-le-dongle/ describes some optimizations. Composite texture caching/pre-calculation and some hack to write visplanes 4 bytes at a time.

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Re: Table Fog & 8-bit Paletted Textures

Posted on 2021-11-16, 14:42

by

by rasz_pl

in Marvin \ Video

in Marvin \ Video

https://developer.download.nvidia.com/assets/gamedev/docs/Fog2.pdf The RIVA128, RIVA128ZX and the RIVA TNT all emulate table fog using vertex based fog. The GeForce 256 supports table fog in hardware. https://www.gamers.org/dEngine/xf3D/glide/glidepgm.htm fog table should consist of 64 density …

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Re: Improving Quake performance on POD83.

Posted on 2021-11-15, 00:26

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Chadti99 wrote on 2021-07-10, 21:51: Too bad the Verite is so terrible playing Doom. its pretty great in FastDoom https://www.youtube.com/watch?v=6unNuPympE4 modeY 14, 13h 60, VBE2 300 fps Have you tried PCI soundcards to see if they have lesser load with sound enabled?

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Re: 32 megs of ram is enough for a DX4?

Posted on 2021-11-08, 16:17

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

2-3x too much. Realistically there is nothing you could do on a 486 that would require, or even run slower than normal with 12-16MB ram.

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Re: Is there a VLB card that supports > Mode 3 or UDMA support?

Posted on 2021-11-08, 08:36

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

VLB is capable of those speeds in theory, its a pure 32bit CPU memory bus, up to 40MHz 32bit. >it doesn't go that fast on a PIII on a PCI bus >were still hard limited by the CPU processor has nothing to do with it if we are taking over the bus. In a similar vein you can saturate 133MB/s PCI bus on a …

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Re: Is there a VLB card that supports > Mode 3 or UDMA support?

Posted on 2021-11-08, 06:52

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

sounds like there's probably a market for a simple bus mastering VL SATA controller if someone were to develop one somehow Something along those lines is in my todo list but nobody knows when the todo list reaches this point lol I'd do it but building the FPGA to translate between PCI SATA …

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Re: Is there a VLB card that supports > Mode 3 or UDMA support?

Posted on 2021-11-08, 03:44

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

EIDE2300+ .... In every case, HDTach showed high CPU usage, so I assume that DMA is not used under Windows. Regarding DMA and Windows, do you have the "DMA" box checked in the HDD properties of device manager (or is that only a Windows 98 thing)? DMA is not used at all because PDC20630 is not a bus …

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Re: How to implement bus transceivers on 486 bus (SIS85C471)

Posted on 2021-11-07, 05:14

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

>You need access Ask for access, or switch to an account with access. Network ones dont use DMA (there are ISA network chips with theoretical capability, but I dont know of any cards actually implementing it). IDE controllers dont. SCSI yes, particularly AHA-1540/1542 does bus mastering. Floppy and …

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Re: How to implement bus transceivers on 486 bus (SIS85C471)

Posted on 2021-11-06, 17:48

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

if it was meant to be unidirectional it would specify 240 or 244. ISA bus master and DMA require this bus to be switchable. Direction is controlled by /MASTER pin (184) connected directly to ISA bus. grab yourself a 460 datasheet and schematic of Samsung system based on it http://www.bitsavers.org/ …

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Re: What system to Voodoo3 2000?

Posted on 2021-11-06, 11:14

by

by rasz_pl

in Marvin \ Video

in Marvin \ Video

Glide games, but I would like to play them in the best possible quality that would be V4-5 territory Voodoo3 2000 PCI is perfect for socket7 systems where you either didnt get AGP, or what you got wasnt stable at all when used according to spec. Another good home is budged PCs with integrated …

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