Re: Reverse stereo in Quake with YMF718 based card
Posted on 2021-01-16, 22:03
The reverse stereo on WB header is a board error on the common Labway card. Other cards I have come across with don't suffer from it.
Re: why sb emulation require virtual 86 mode
Posted on 2021-01-16, 20:45
Pure hardware solution requires chipset support, and all that support is variable within old chipsets and completely absent in things past Pentium III era. For example with many chipsets, access to a chipset peripheral such as DMA controller will not be visible on PCI bus so there isn't anything to …
Re: why sb emulation require virtual 86 mode
Posted on 2021-01-16, 17:12
PCI cards cannot handle ISA DMA, a compatibilityTSR must be able to capture the writes to DMA controller which necessitates entry into protected mode. Then it can capture all the DMA controller writes and initiate sound playback on the actual hardware.
Re: Newly made 4MB 30pin SIMMs
Posted on 2021-01-16, 12:21
Last time I looked there certainly were a lot of them available on ebay from some USA sellers. I will have more sticks available soon, I got the chips and PCBs and I will have to cook up a new batch and test them. No parity this time either. Apparently my PCB design got cloned in Russia, a friend …
Re: Reverse stereo in Quake with YMF718 based card
Posted on 2021-01-16, 11:41
There's no channel swap feature in YMF71x chips. I don't recall having channels swapped in Quake but it has been a long time since I played it (not among my fav games 🤣)...
Re: Looking for Windows 95 PCI Gigabit 1000Mbps ethernet card.
Posted on 2021-01-14, 20:20
On Win98/SE/ME I use a program called TCPoptimizer, I'm not sure if it works on Win95 but it should be able to cure the bottleneck you're seeing.
Re: Weird memory layout on generic Trident 9440
Posted on 2021-01-14, 19:39
You get the approximate pixel clock requirement by (X res * Y res * Refresh rate Hz * blanking overhead). 1.3 is a good blanking overhead figure. The actual amount of pixels per line is longer than what is visible and there are a small handful of more lines total, the excess is blanking+sync area. …
Re: Weird memory layout on generic Trident 9440
Posted on 2021-01-14, 17:38
Might have been enough video memory for 1024 x 768-24b, but I don't think the 108Mhz pixel clock in the TGUI9440-3 was powerful enough for that. I think it may have tapped out @ 1076x768-16b interlaced. https://datasheet.datasheetarchive.com/originals/distributors/Datasheets-32/DSA-639114.pdf Ok, …
Re: Weird memory layout on generic Trident 9440
Posted on 2021-01-14, 14:44
Wow, that is a strange arrangement indeed. I suppose it is to get just enough video memory for say 1024 x 768 with 24bit color.
Re: Simmconn AWE64 Adapter
Posted on 2021-01-13, 20:48
That's a great document, thänk you for showing it ~
Re: Yamaha YMF71x SB Pro Mixer Bug Issue Fix
Posted on 2021-01-11, 12:28
At best you have to sever the MIDI TX line and add a switch to choose between onboard and WB header. Though an electronic method is also possible using a multiplexer chip and taking advantage of the fact that all WB cards connect a row of grounds together, so you can separate one of them on the host …
Re: Yamaha YMF71x SB Pro Mixer Bug Issue Fix
Posted on 2021-01-11, 06:14
LIke real SBpro and Yamaha DACs for the FM chips, there is only single actual DAC which output is multiplexed to create a stereo output, and the sample & hold capapcitors hold the output steady while the other channel is being updated. Lack of those capacitors will add high freq noise on the output …
Re: Differences between CMI8330A, CMI8330C, and HT1869V?
Posted on 2021-01-09, 12:52
PARUS wrote on 2021-01-07, 21:09: It does not matter. Both TTL and COAX are full-fledged proper S/PDIF. They differ in signal amplitude only. If you have TTL (2-3 […] Show full quote It does not matter. Both TTL and COAX are full-fledged proper S/PDIF. They differ in signal amplitude only. If you …
Re: Yamaha YMF71x SB Pro Mixer Bug Issue Fix
Posted on 2021-01-09, 04:05
YMF711/718 has slightly different pinout as far as those capacitors go, the caps of interest are on pins 97 and 98 rather than 99 and 100 of 715/719
Re: Differences between CMI8330A, CMI8330C, and HT1869V?
Posted on 2021-01-08, 13:42
I would simply get a suitable bracket or make my own. You only need one 374ohm resistor and one 90.9ohm resistor in addition to wires and connectors.
Re: Differences between CMI8330A, CMI8330C, and HT1869V?
Posted on 2021-01-08, 13:15
Yes, direct connection is not gonna work and in worst case will destroy the signal on the card. There needs to be some extra bits inline with the signal, such as two resistors (and ideally a transformer) as seen on the photo in previous page. You can do direct connection from one card's TTL output …
Re: Differences between CMI8330A, CMI8330C, and HT1869V?
Posted on 2021-01-08, 09:46
The chip itself only outputs TTL, to get coax some extra stuff is necessary but this is true with pretty much all the different chips out there. Coax is 1Vpp into 75ohm load, and usually is transformer coupled to prevent ground loops from being a problem. TTL signals are meant for internal …
Re: Creative AWE64 CT4500 upgraded to 2MB of RAM
Posted on 2021-01-05, 23:36
Cutters will probably damage pads on the PCB since the force it excerts on the pin has only up or down to go and neither direction works, a knife straight down will work lot better as it will push pin sideways away from the chip where it can go.
Re: Creative AWE64 CT4500 upgraded to 2MB of RAM
Posted on 2021-01-05, 12:04
I don't think this will succeed, but since you most probably are not going to reuse the old chip just cut its pins off (I use a razor knife for such stuff when I must do it), then remove the pins one by one and solder in new chip. Though you could also heat the pin and then push it sideways until it …
Re: Differences between CMI8330A, CMI8330C, and HT1869V?
Posted on 2021-01-05, 02:34
C version integrates the 3D chip that is normally external, it also makes the card more noisy due to it. I have not observed any other functional differences between various chip revisions.
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