Wild-E wrote on 2020-09-02, 08:57:

And, btw, the BIOS listing will only list PCI devices IRQs. (Non-PnP) ISA IRQs are H/W based, BIOS knows nothing about them (exception: those devices which are configured in BIOS, which is possible only in modern BIOSes - and usually includes the already mentioned COM and LPT ports).

Aware of this.

carlostex was asking if my SCSI card was conflicting, which, being a PCI card, is on that screen.

And you can see it there, using IRQ 10 and 12. So whatever is hogging IRQ 9 isn't the SCSI card. 😀

According to Wiki ACPI could be using IRQ9. Not sure if P233MMX chipsets even have ACPI. Could be that the BIOS only lists "addons"... Anyways, I have no experience with that HardMPU thing.

Socket 7 chipsets can have ACPI.

I wouldn't be surprised if squallstrife's motherboard has ACPI. Usually ACPI is reported which IRQ it uses during boot, but i've seen cases where it is there and not reported.

Knowing how Gateway behaves with IRQ issues, i was willing to bet that was the issue. Glad you got it working.

The Tyan board has a 430HX chipset, no ACPI. (Need a TX for that, I think?)

Cool project. Looking forward to when orders are available, been looking for something like this.

I have a few questions regarding how SPDIF works on the AWE Legacy .

Does in work under DOS ?
Is everything re-sampled to 44.1 KHz ?
Is the YMF262 signal present on the SPDIF output ? Incidentally, is the YMF262's output received as digital or analogue ?

It works in the same way as a regular CT4520 does. So, only EMU8K+CQM are there, nothing else.

hard1k wrote on 2020-09-13, 01:58:

It works in the same way as a regular CT4520 does. So, only EMU8K+CQM are there, nothing else.

Thank you for the clarification . This actually makes my life simpler as I will not need to figure a way to get another SPDIF input on my mixer/recorder as I will be sticking to analogue output .

hard1k wrote on 2020-09-13, 01:58:

It works in the same way as a regular CT4520 does. So, only EMU8K+CQM are there, nothing else.

Emu8k outputs OPL over spdif too on awe32.

kolderman wrote on 2020-09-13, 02:19:

hard1k wrote on 2020-09-13, 01:58:

It works in the same way as a regular CT4520 does. So, only EMU8K+CQM are there, nothing else.

Emu8k outputs OPL over spdif too on awe32.

Only if the OPL3 is actually CQM based, AFAIK .

darry wrote on 2020-09-13, 02:20:

kolderman wrote on 2020-09-13, 02:19:

hard1k wrote on 2020-09-13, 01:58:

It works in the same way as a regular CT4520 does. So, only EMU8K+CQM are there, nothing else.

Emu8k outputs OPL over spdif too on awe32.

Only if the OPL3 is actually CQM based, AFAIK .

OPL integrated into the main chip is output over spdif, only discrete opl is not.

kolderman wrote on 2020-09-13, 02:50:

darry wrote on 2020-09-13, 02:20:

kolderman wrote on 2020-09-13, 02:19:

Emu8k outputs OPL over spdif too on awe32.

Only if the OPL3 is actually CQM based, AFAIK .

OPL integrated into the main chip is output over spdif, only discrete opl is not.

AFAIK, if OPL is integrated into main chip it is necessarily CQM .

darry wrote on 2020-09-13, 02:52:

kolderman wrote on 2020-09-13, 02:50:

darry wrote on 2020-09-13, 02:20:

Only if the OPL3 is actually CQM based, AFAIK .

OPL integrated into the main chip is output over spdif, only discrete opl is not.

AFAIK, if OPL is integrated into main chip it is necessarily CQM .

Only on awe64, on awe32, at least the 2760, 3900 and 3980 have chip integrated opl, which is why they are such Cadillacs of sound cards 😀

kolderman wrote on 2020-09-13, 02:54:

darry wrote on 2020-09-13, 02:52:

kolderman wrote on 2020-09-13, 02:50:

OPL integrated into the main chip is output over spdif, only discrete opl is not.

AFAIK, if OPL is integrated into main chip it is necessarily CQM .

Only on awe64, on awe32, at least the 2760, 3900 and 3980 have chip integrated opl, which is why they are such Cadillacs of sound cards 😀

Ah, after reading http://nerdlypleasures.blogspot.com/2015/02/d … -recording.html and other sources, the cards with a CT1747 chips have a licensed OPL3 core that does output digital output SPDIF , if I understand correctly . I somehow missed that, probably, in part, because I pretty much ignore all cards that do not have a 4.16 DSP version (for non OPL/CQM related reasons) .

I imagine that the 49,716Hz digital output from the OPL core those cards gets re-sampled to 44.1 KHz for SPDIF output, or does it and if so how ?

Guys, guys, guys 😀
Both AWE32 (all flavors) and AWE64 (all flavors) will output FM in digital by design, despite the actual FM implementation.
FM digital output is fed into the EMU8K and thus using its 2 voices. I believe, it was made in order to cut costs on a dedicated DAC for the FM chip (Creative is so Creative), but unexpectedly gave us some benefits instead of losses:
1. FM can be get in digital (as S/PDIF out is always taken from the EMU8K output, which passes the FM signal through).
2. FM can get reverb and chorus thanks to its routing through the EMU8K.

But there is no difference if it's a discrete or integrated OPL3 on AWE32, or if it's OPL3 or CQM on later AWE32 or AWE64.
However, due to the CT8920 chip being a highly integrated black box with no documentation available, our discrete OPL3 still has its own DAC and it is just routed into the mixer, that's it. So no digital OPL3 on AWE64 Legacy, unfortunately.

darry wrote on 2020-09-13, 03:21:

I imagine that the 49,716Hz digital output from the OPL core those cards gets re-sampled to 44.1 KHz for SPDIF output, or does it and if so how ?

The output sample rate of the OPL3 does get converted by the EMU8000, but the exact means (presumably) remains speculative. There was a whole thread several years back about this, if you're interested: OPL recording problem

hard1k wrote on 2020-09-13, 03:26:

Both AWE32 (all flavors) and AWE64 (all flavors) will output FM in digital by design, despite the actual FM implementation.

Not entirely. For reasons unknown, AWE32/SB32 variants bearing a discrete CQM chip (CT1978) do not route the FM output through the EMU8000.

hard1k wrote on 2020-09-13, 03:26:

Guys, guys, guys :) Both AWE32 (all flavors) and AWE64 (all flavors) will output FM in digital by design, despite the actual FM […]
Show full quote

Guys, guys, guys 😀
Both AWE32 (all flavors) and AWE64 (all flavors) will output FM in digital by design, despite the actual FM implementation.
FM digital output is fed into the EMU8K and thus using its 2 voices. I believe, it was made in order to cut costs on a dedicated DAC for the FM chip (Creative is so Creative), but unexpectedly gave us some benefits instead of losses:
1. FM can be get in digital (as S/PDIF out is always taken from the EMU8K output, which passes the FM signal through).
2. FM can get reverb and chorus thanks to its routing through the EMU8K.

But there is no difference if it's a discrete or integrated OPL3 on AWE32, or if it's OPL3 or CQM on later AWE32 or AWE64.
However, due to the CT8920 chip being a highly integrated black box with no documentation available, our discrete OPL3 still has its own DAC and it is just routed into the mixer, that's it. So no digital OPL3 on AWE64 Legacy, unfortunately.

There is a difference, the external ymf chip goes straight into the mixer on awe32. Even if it could in theory go into the emu8k they didn't design it that way. E.g. look at the ct3930.

the way i see the opl chip on this awe64 legacy board it will sound just like it did on sb16. problem is is cqm isolated muted if you like on all situations?

Cloudschatze wrote on 2020-09-13, 03:37:

The output sample rate of the OPL3 does get converted by the EMU8000, but the exact means (presumably) remains speculative. Th […]
Show full quote

darry wrote on 2020-09-13, 03:21:

I imagine that the 49,716Hz digital output from the OPL core those cards gets re-sampled to 44.1 KHz for SPDIF output, or does it and if so how ?

The output sample rate of the OPL3 does get converted by the EMU8000, but the exact means (presumably) remains speculative. There was a whole thread several years back about this, if you're interested: OPL recording problem

hard1k wrote on 2020-09-13, 03:26:

Both AWE32 (all flavors) and AWE64 (all flavors) will output FM in digital by design, despite the actual FM implementation.

Not entirely. For reasons unknown, AWE32/SB32 variants bearing a discrete CQM chip (CT1978) do not route the FM output through the EMU8000.

Thanks for the thread link. I will have a read through .