Thanks from reply and corfirmation. Interesting because low known chip. It is Ensoniq with codec interated into one chip. Square instead rectangular. And produced by "OPTi" division of Creative Labs.
I searched for cards and found only two:
First is a CT4730. It is SB AudioPCI 64V? I found AudioPCI64V was used by Dell and maybe by Compaq. And Dell 64V drivers looks like common Ensoniq AudioPCI drivers.
In 1997, Ensoniq introduced AudioPCI - a budget PCI sound card. At the time, the company was getting squeezed out of the market by Creative Labs, and so needed to change direction away from high-end audio and into the budget OEM market. For this new card they devised an ISA software audio emulation driver that was compatible with most DOS games. It was rare for PCI sound card manufacturers to bother with DOS compatibility now that Windows was taking over the world. To OEMs the card was sold for ~$50 USD a piece. For anyone else, closer to ~$80 USD.
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The driver virtualised a Sound Blaster-compatible card through the use of Non-Maskable Interrupts (NMI), effectively capturing commands that would be send to an IRQ (Interrupt Request Line) and redirecting them to the AudioPCI card. After Ensoniq's takeover by Creative Labs, this driver was incorporated into the Creative Sound Blaster Live! (although while Creative added support for Sound Blaster 16 to this range of cards, they dropped support for the legacy Ensoniq SoundScape).
The Ensoniq AudioPCI DOS driver included Ensoniq Soundscape 16-bit digital audio and sample-based synthesis support, along with support for Sound Blaster Pro, AdLib Gold, General MIDI, and Roland MT-32. However, without actual hardware for FM synthesis, FM music and sound effects were simulated using samples, often with unacceptable results. Therefore, it was more practical to configure DOS games to utilize the General MIDI synthesizer and digital sound effects whenever possible for better sound quality.
At the heart of the first AudioPCI cards was Ensoniq's ES1370 chip. In order to keep the cost of manufacture and design way down, some of the handling of audio functions for this chip were handled by the host PC in software [the driver], not in the ES1370 chip. The ES1370 consisted of:
Following the first version of AudioPCI, Ensoniq released "AudioPCI 97" in the form of chip ES1371, which was their first AC'97-compliant chip. AC'97 stands for Audio CODEC '97, and was a multimedia sound card specification put together by Intel and others. Like the ES1370, ES1371 had the same four subsystems listed above, except the Codec was now AC'97-compliant. The Creative Labs CT5880 chip was a relabelled ES1371 but with added 5.1 channel output.
The Ensoniq AudioPCI is a Peripheral Component Interconnect (PCI)-based sound card released in 1997. It was Ensoniq's last sound card product before they were acquired by Creative Technology. The card represented a shift in Ensoniq's market positioning. Whereas the Soundscape line had been made up primarily of low-volume high-end products full of features, the AudioPCI was designed to be a very simple, low-cost product to appeal to system OEMs and thus hopefully sell in mass quantities.
The ".ecw" file format (Ensoniq Concert Wavetable) was never made open as had been hoped for by enthusiasts.[1] Consequently, there are very few custom wave sets available, in contrast to the huge availability of home-made releases in E-mu's SoundFont format. It was particularly unfortunate because the AudioPCI used system RAM for patch set storage which in itself offers tremendous potential for new patch sets over the traditional ROM storage previously used. It is also disappointing considering the incredible popularity and longevity of the Ensoniq ES1370 chipset and its descendants, some of which were still in use six years after the original AudioPCI board, and the fact that DOS drivers for the far newer Sound Blaster Audigy still use ".ecw" wave sets. These newer cards are unable to use SoundFonts in DOS, limiting them to the three official .ecw wavesets from the late '90s and one incomplete unofficial waveset.[2]
The AudioPCI supported DOS games and applications using a software driver that would install during DOS, or the DOS portion of Windows 9x. This driver virtualized a Sound Blaster-compatible ISA sound card through the use of the PC's NMI and a terminate-and-stay-resident program. This allowed the AudioPCI to have more compatible out-of-the-box DOS support than some of its PCI competitors for the time.
For example, the competing Monster Sound from Diamond Multimedia was limited to running DOS games in Windows 9x-DOS command windows, meaning DOS compatibility was frequently only reliable through an additional ISA sound card. Creative was struggling with the challenge of legacy support as well, and had created the SB-Link, an interconnect that allowed access to the serial-IRQ and PC/PCI grant/request sideband signals offered by some PCI chipsets of the time, in order to achieve DOS compatibility for their Sound Blaster AWE64-variant PCI sound cards. SB-Link was also used by a number of other chipset vendors, such as ESS and Yamaha.
While Ensoniq's approach generally worked with most games, some older games had problems detecting the virtualized hardware on some systems. In addition, the DOS driver required a memory manager such as EMM386 to be loaded, which not only required additional conventional memory space but also put the CPU into Virtual-86 mode, conflicting with games that utilized a modified form of protected mode, called 'flat mode'. This mode allowed fast, direct access to the system's entire RAM without requiring a memory manager or memory protection mechanism. This is not a requirement exclusive to AudioPCI, however, as a number of ISA sound cards used it as well, including the Creative AWE ISA series.
The AudioPCI DOS driver included Ensoniq Soundscape 16-bit digital audio and sample-based synthesis support, along with support for Sound Blaster Pro, AdLib Gold, General MIDI, and MT-32. However, without actual hardware for FM synthesis, FM music and sound effects were simulated using samples, often with unacceptable results. Therefore, it was practical to configure DOS games to utilize the General MIDI synthesizer and digital sound effects, whenever possible, for better sound quality. DOS MIDI utilizes the same .ecw patch set files as Windows MIDI.
Part of the deal when Ensoniq was purchased by Creative Labs was to integrate the AudioPCI DOS driver into the upcoming Sound Blaster Live!. Creative added Sound Blaster 16 emulation to the driver and removed the Ensoniq SoundScape support. AudioPCI itself was re-branded as several Creative Labs sound cards, including the Sound Blaster PCI 64, PCI 128, Vibra PCI, and others. The Ensoniq ES1370 audio chip was renamed Creative 5507 and revised into AC'97-compliant variants, the ES1371 and ES1373, and used for several more years on card and as integrated motherboard audio.
Cards with ES1370 run natively at 44 kHz sampling frequency, meaning that 12, 24, 32 and 48 kHz become resampled. Resampling means lower sound quality, worse synchronization and possibly higher CPU utilization. Cards with ES1371 run at 48 kHz conforming to AC97, so 11, 22 and 44 kHz become resampled. For few soundcards feature multiple quartzes or a PLL, resampling is often used with all its potential problems.
The AudioPCI ES1370 was developed by Ensoniq. One important feature of this chip was that it used the PCI bus, instead of the ISA bus commonly used by sound cards at that point. It was one of the first PCI sound card solutions to offer MS-DOS legacy compatibility without special hardware extensions to the standard PCI slot. When paired with a capable codec, such as the AK4531 (pre-AC'97), the ES1370 supported the then-latest in 3D audio positioning through 4-speaker surround sound. The chip was also a PCI bus master device that was designed to provide high-speed access to system RAM and resources, for sample synthesis data and effect processing. Depending on the drivers, it may also be called the Sound Blaster 64/128 in the device manager.
Almost immediately, the click sound effect produced by Windows Explorer when changing folders BSODed the system, to the amusement of that contributor who was sitting at the system and watching the situation unfold. As expected, it entered a boot loop from trying and failing to play the startup sound, but at least we now knew that the driver is indeed broken.
This is not a survey of PCI audio in general but one that focuses on theproblems that were created during the migration of sound cards and integratedaudio from ISA to PCI circa 1998. The most important questions are "Does itwork with DOOM?" and "Does it mangle 44.1 kHz music?"
For PCI cards the former question is inextricably bound to the motherboardchipset, and a bad choice of motherboard for testing will mean that mostcards just won't work. OTOH, it's nearly pointless to test PCI audio on thegold standard of compatibility (440BX) because that usually comes with ISAslots. Back in the day, the newer PCI sound cards were of course representedas being upgrades over the older ISA ones, but it was a blunder to acceptthem as such and install them in systems with working ISA slots.
Most music files use a 44.1 kHz sample rate and most of the sound effectsin DOS games use some multiple of that (e.g., 22050 Hz or 11025 Hz). ISAsound cards were built around that reality, but early PCI sound cards insteadmade a hard switch to 48 kHz for no good reason(ES1370AudioPCI cards being a notable exception).
Although the hardware synth on Live! and Audigy cards certainly works witharbitrary SF2 soundfonts, the DOS drivers for all of these cards will onlyaccept ECW soundfonts. There are three canonical ECW soundfonts and fewothers in existence.
None of these cards has an OPL3 implementation in hardware. For theearlier cards, FM is emulated poorly using the synth. For the SoundBlaster Live! the emulation is credible, but it is laggy and causes soundeffects to glitch. 589ccfa754
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