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Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-23, 15:19

in Marvin \ Sound
after huge few hours fight, i got "S3 Sonic Vibes" working in DDMA mode on VT82C586B. So, yes, VT82C586 has no DDMA (double confirmed based on the datasheet and test in practice i've done), but VT82C586B has DDMA. There is no datasheet for VT82C586A and I have no access to motherboard with it. So, …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-22, 16:04

in Marvin \ Sound
VT8239A Hmm... that's either a very weird and rare south bridge or a typo. :exclamation: of course a typo, i meant VT8237A Pretty sure the V-Link compatible SBs include the VT8231 (uncommon), VT8233, VT8235, VT8237, and VT8251 (including their various revisions). i don't know what you understand by …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-21, 16:43

in Marvin \ Sound
busy week, but let me post quick update. so, please, do not buy CMedia cards, because at least CMI8738 rev037 (i have) - DDMA doesn't work for me. Maybe, rev033 supports DDMA, but at least one forum member reported has such and let me first make small test tool and we get feedback. So, currently, I …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-17, 20:32

in Marvin \ Sound
Could you share? Would very much like to see/hear it in action :) yes, i will do, it's all experimental mess at the moment, as i mentioned in a previous post maybe in 1-2 weeks or something i will be able to prepare something as proof-of-concept public release. And yes, that 4DWave-NX is great, …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-17, 17:39

in Marvin \ Sound
ok, figured out the discrepancy with VT82C586. So, there are actually 3 versions: * VT82C586 - what I have and on what I tested. No datahsheet is publicly available, at least one that i can find. However, on my tests it's 100% sure no DDMA. * VT82C586 A - maybe it's the same as "VT82C586", i.e. when …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-17, 15:40

in Marvin \ Sound
T82C686 as I mentioned close to excellent, but on VT82C586 I cannot get DDMA working Technically it's not required for VT82C586 anyway, because they usually have 2-3 ISA slots. both agree and disagree, because my main point is that VIA states DDMA support in their datasheet, which I cannot confirm …

DDMA and PCPCI for Low IQ Individuals (Me included)

Posted on 2019-11-17, 15:29

in Marvin \ Sound
Disclaimer: This post depends on your comments, suggestions, etc to reach maturity. I don't claim i know everything - on the contrary. However, I will try to regularly update it based on new information and suggestions, until it reaches total reliability of the provided information. 0. Preamble In …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-17, 13:25

in Marvin \ Sound
For some reason, Kamerat was able to initialize and use some cards on a vt8233 south bridge with DDMA mode. i am 99.9% sure Kamerat is mistaken, because for FM801 mentioned I don't know (if I can find any datasheets I will check more), but the other one ALS4000 - has emulation mode that works even …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-17, 02:09

in Marvin \ Sound
Out of interest - what is the added value of DDMA if the only chipsets supporting it are ones supporting regular ISA anyway? that's not true, for example VT82C686 has close to excellent DDMA support and there are many motherboards with that chipset without any ISA slots. also, some PCI cards have …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-15, 11:33

in Marvin \ Sound
Yeah, but the string before the "037D" is different, which may indicate a different model, so we won't know for sure until I try. that i believe is just a batch number from the factory. What is curious is that the motherboard manual states it has FM and wavetable synthesis, yet a Yamaha softsynth …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-15, 02:39

in Marvin \ Sound
I have a CMI8738 model 33 great, i will prepare and post here small tool you can run to check if on rev 33, address 40h is writable. [EDIT] I've just found my card based on Trident 4DWave-DX chipset - it uses same 40h for DDMA. So, that will allow me to do good research from my side. that's good, …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-15, 02:28

in Marvin \ Sound
VT823x on an ApolloPro133A? Nope, this is a DFI TA-64, pairing the 694X with an old 596B. that one i believe doesn't support DDMA, but I am not sure, because 596 was intended as laptop chipset. So, I believe it has only PC-PCI/SBLink support (as that was used for a docking station with ISA slots …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-15, 02:19

in Marvin \ Sound
that's the eternal question, you need to check your South Bridge - if it's VT823x or newer, then you're out of luck. If I recall correctly, VT8231 supports DDMA but later south bridges (VT8235 etc.) do not. nope and i don't see a point we even argue on this, when VIA Datasheet are publicly …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-15, 02:06

in Marvin \ Sound
I have here a Asus CUSI-M motherboard with a CMI 8738/PCI-SX HRTF Audio Com M2M08-037D 0111UGGD. Driver CD includes DOS drivers. "037D" - that's same revision as mine. so, that one doesn't allow me to write to the DDMA register. anyone with revision "033" or with CMI8338? those are before "037" and …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-14, 10:43

in Marvin \ Sound
- Aztech PCI288 - 4DWave-NX A CCC02 M5630 9944/39110277 that's what I am looking at the moment, because I also found my "NX", but the "DX", for which there is more information available in form of datasheet, I still cannot find. however, at the moment this project transformed to make tool for DDMA …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-13, 10:28

in Marvin \ Sound
From what I did find out, not all CMIs were the same, despite having the same model number. i agree - in many cases with Cmedia chips, the marking is deceitful or misleading, but the chip revision doesn't lie (otherwise even the software will be confused). So, in some cases (in my experience mostly …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-13, 02:35

in Marvin \ Sound
found something interesting and that can be very helpful - "Trident 4D Wave DX" use the exact same 40H address as Cmedia for DDMA activation: 4.1.2.1 Distributed DMA Configuration (Offset = 40h) DDMA Base Address 3 Non Legacy Extended Addressing Control (Fully 32 bit Addressing) 0 = disabled 1 = …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-13, 02:12

in Marvin \ Sound
Kodi, are you able to hear FM music in MS-DOS with your CMI8738? If I remember correctly, after a certain revision, the FM block was removed. I think your best bet is to find a CMI8738 card that does not have the SX/LX label on the chip. i cannot recall in which exact revision the FM was removed, …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-12, 19:49

in Marvin \ Sound
the only other source of information I found is Linux ALSA driver, where we have the following: #define CM_TXVX 0x08000000 /* model 037? */ /* Assume TX and compatible chip set (Autodetection required for VX chip sets) */ switch (pci->device) { case PCI_DEVICE_ID_CMEDIA_CM8738: case PCI_DEVICE_ID_ …

Re: Cmedia CMI8738 - maybe its Biggest Secret

Posted on 2019-11-12, 18:51

in Marvin \ Sound
hmm, I don't know, at least I see no other option for interpretation than: 1) Cmedia words "0 VX chip sets" and "1 TX chip sets", I read respectively as "DDMA disabled" and "DDMA Enabled" 2) Cmedia words "Slave Base Address 15-4. INTEL VX chipset seleted if Base Address 15:4=000h", I read as if TX …

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