Re: Purpose of pots (potentiometers) on old motherboards.
Posted on 2020-03-29, 05:31
Those are not potentiometers but trimmer caps. They are used to tune the relevant freq exact at a given temperature.
Re: Mobility radeon x700 and win9x.
Posted on 2020-03-28, 04:25
I added my ID's to [mfg] section in C8.INF file in the Catalyst 6.2 drivers : "ATI RADEON XPRESS 200" = RS480_ENU, PCI\VEN_1002&DEV_5955&SUBSYS_308B103C "ATI RADEON XPRESS 200 " = RS400_ENU, PCI\VEN_1002&DEV_5A41 "ATI RADEON XPRESS 200 Series" = RS482_ENU, PCI\VEN_1002&DEV_5974 You'll probably have …
Re: Mobility radeon x700 and win9x.
Posted on 2020-03-28, 02:14
It probably isn't supported by the existing drivers as is, but after adding the device IDs to the driver INF files it will probably work as it did with Xpress200 chipset's integrated video that I was using on my HP NX6125 laptop.
Re: Monitor color issue.
Posted on 2020-03-25, 21:59
If any of the colors lines were not connected there wouldn't be gray tones possible. This most probably is the video card identifying the monitor as something "not color" and a fix is setting ID pins to something that tells the video card "color monitor". I have modified several video cards into …
Re: PCI Bus Mastering in DOS
Posted on 2020-03-25, 03:15
Card can most probably move data faster than CPU can in its tightest loop when doing GUI acceleration operation such as scrolling which is where bus mastering probably comes in on those video cards. In DOS there's gonna be no interface for such a thing to be used and nothing will even know such a …
Re: Micro ATX 486 - what's the degree of interest?
Posted on 2020-03-22, 19:41
I have one of the Elan520 based PC104 boards, and the main problem is lack of cache which hurts performance a lot. PCI bus will allow all other things to be taken care of though.
Re: Which soundcard for late 486 windows 95 build.
Posted on 2020-03-20, 20:16
My vote goes for the Yamaha too (notbiasedatall lol). It is a much better Windows card than the others and works great in DOS, plus it will let you use MPU401/MIDI music in pure DOS without needing an external MIDI device (although YMF704 isn't particularly great sounding compared to most external …
Re: What is the purpose of having a high DMA channel on SB16 etc.
Posted on 2020-03-18, 13:35
High DMA channels let you transfer 16bits in one cycle rather than two. That is pretty much the only reason these channels exist and why they are used. WSS cards only use 8bit DMA channels and do twice as many DMA cycles compared if they used 16bit DMA that SB16 and few others can do.
Re: Help with fixing Creative TNT2 Ultra
Posted on 2020-03-18, 12:13
Yes, remove inductor and connect the two pads together (or put a wire across the inductor, but that won't look as neat usually). Those inductors and capacitors form a peaking network that relies on resonances to boost transitions of signals that makes some resolution (say 1024x768) look little …
Re: dos 7.10 on an xt?
Posted on 2020-03-17, 20:59
Yeah, 7.x needs 386 or higher to function.
Re: Help with fixing Creative TNT2 Ultra
Posted on 2020-03-17, 12:24
Short out those inductors and you get a sharper image (and remove the little capacitors sitting between video signal and ground).
Re: PCie-to PCI, PCI to ISA, # of slots multipliers - bridges, risers, backplanes, research, especially for DOS, WIP.
Posted on 2020-03-17, 12:04
Lack of LDRQ means that DMA controller should be finally deleted from the chipset, which means it should be possible to create your own over PCI or PCI-E and no longer need LPC for anything except for SERIRQ signal. FPGA will be necessary though, CPLD will be too small for such a stunt. PCI-E puts …
Re: PCie-to PCI, PCI to ISA, # of slots multipliers - bridges, risers, backplanes, research, especially for DOS, WIP.
Posted on 2020-03-16, 21:24
LPC bus has everything necessary, what does matter is IO ports configuration and a custom utility will be needed for that. DMAs aren't used by anything on the board though IRQ assignments may be on the arbitrary side by the BIOS but that can still be fixed by reprogramming the chipset. EDIT: …
Re: MS-98L9 V2.0 , a new 1151MB with an ISA slot
Posted on 2020-03-16, 19:55
Turns out this board has LPC to ISA bridge, same chip as one on my C2D board so it will be able to support at least some ISA sound cards ~ Southbirdge chip has no LDRQ signal on the LPC bus, so DMA is not possible even though the bridge chip can support DMA... bummer.
Re: PCie-to PCI, PCI to ISA, # of slots multipliers - bridges, risers, backplanes, research, especially for DOS, WIP.
Posted on 2020-03-16, 19:54
Ok, nice, same bridge as my C2D board. This is exciting as the bridge definitely supports ISA DMA, as long as LDRQ is connected ~ My pockets are empty though, but if I am gonna upgrade, that's a board I would want to get 🤣.
Re: PCie-to PCI, PCI to ISA, # of slots multipliers - bridges, risers, backplanes, research, especially for DOS, WIP.
Posted on 2020-03-16, 15:52
A thread was made of this board earlier today. I do wonder what bridge chip it uses, so it could be determined if there's ISA DMA or not.
Re: MS-98L9 V2.0 , a new 1151MB with an ISA slot
Posted on 2020-03-16, 09:08
A friend showed it a moment ago and I tried to find more info but I was unable to. There's no good photos around so I could see what the ISA bridge chip is. There's a good chance it lacks working DMA and IRQs which makes the slot useless... but I am certainly excited to some level.
Re: Successfully modding a 486 motherboard to use 3.3V CPUs
Posted on 2020-03-15, 12:08
I would try watching the voltage drop on a datalogging multimeter while heavily loading the CPU. The other thing comes to my mind is checking all you filter caps, especially if they all are old tantalums. Maybe try to search for unpopulated caps near the regulator and the CPU socket Vcore pins. I …
Re: Successfully modding a 486 motherboard to use 3.3V CPUs
Posted on 2020-03-14, 21:11
I have added 3.3V support on all the mobos I have which are supposed to have support but regulator isn't present. I have one board which is not stable with 3.3V, I will have to try to see if boosting voltage makes it stable.
Re: Fujitsu ICL Indiana
Posted on 2020-03-14, 16:34
I have one also, but insides have changed over the years. http://www.tmeeco.eu/ABOUT/ServFrnt.jpg http://www.tmeeco.eu/ABOUT/ServBack.jpg http://www.tmeeco.eu/ABOUT/SideShot2.jpg (not the original board or hardware) Originally it had 32MB RAM, Pentium 166 (without MMX), Mach64CT with 1MB RAM, Labway …
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