DerBaum wrote on 2023-10-03, 12:17:

Can you post a good quality picture (front and back) of your ct2950 with ymf289b opl? […]
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LSS10999 wrote on 2023-10-03, 06:49:

I have a CT2950 with YMF289B instead of CQM...

Can you post a good quality picture (front and back) of your ct2950 with ymf289b opl?

Here is mine without OPL (4.13 DSP):
2023-10-03 14.08.50.jpg2023-10-03 14.09.13.jpg
I think it could be a nice side project to try to find out of the missing opl´s can be retrofitted (in a new thread of course).

Sorry, can't do it right now, as the card is currently installed and actively in use in a system of mine.

You can refer to this picture posted here. In my card's case, the CQM chip as well as its surroundings are absent while the stuffs in the red circle (which contains the YMF289B and YAC516) are populated.

Searched about CT2950 online but it seems the variant that uses YMF289B instead of CQM is less common. I'm able to find some pics online that matches my actual card, however.

LSS10999 wrote on 2023-10-03, 17:00:

it seems the variant that uses YMF289B instead of CQM is less common

that's kind off-topic here, but probably just custom-modified card by someone and then it was sold and ended up with you, because 5 years ago it was posted here "I de-CQMed my AWE32 PnP CT3990...!":

I de-CQMed my AWE32 PnP CT3990...!

and such modification became popular among the retro-community, i.e. how to replace CQM with YMF289B on SB cards that have (unpopulated) pads for both those chips. I myself ordered back then all the necessary chips, but I did not actually do it...

LSS10999 wrote on 2023-10-03, 17:00:

Searched about CT2950 online but it seems the variant that uses YMF289B instead of CQM is less common. I'm able to find some pics online that matches my actual card, however.

This is why i asked. I can only find pictures of the card without opl like mine i posted pictures of.
Maybe you can share a link to a picture of your type of card?
I didnt know that CQM is discrete chips. thats really good to know.
I have some cards where i want to fit a real opl if i can figure out wich components i have to add/remove.

mattw wrote on 2023-10-03, 17:10:

I de-CQMed my AWE32 PnP CT3990...!

thanks. that was an interesting read and answered basically all of my questions 😁

DerBaum wrote on 2023-10-03, 17:35:

thanks. that was an interesting read and answered basically all of my questions 😁

I am 99% sure that @LSS10999 card was modified by someone and it's not manufactured like that by Creative, but in any way, it doesn't really matter as such modification is possible both ways and thus this off-topic is now settled.

Sb16dump V0.04
CRC32 calculation, output, and dump type determination (known discrete,known integrated, unknown).
Different filenames are used based on dump type
And logs are not overwritten on each run.

Please give me some feedback - is it working ?
I have absolutely no means to test it.

Maelgrum wrote on 2023-10-03, 16:19:

Ultimate goal is to crack and dump 4.16. It fixes single cycle dma bug, and I think it may work on older SB/AWEs. Secondary goal […]
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SETBLASTER wrote on 2023-10-03, 15:43:

What is is it that you are trying to achieve with those dumps?

Ultimate goal is to crack and dump 4.16. It fixes single cycle dma bug, and I think it may work on older SB/AWEs.
Secondary goal - dump 4.12, just for completeness sake.
And it is fun to have such a tool, doing what was meant impossible.
PS. Dumps recently posted is for answering a question - is all 4.13 are same, or may be different for some reason.

I'm ready to dump my 4.12 card but I'd rather do a 4.16 one first 😀

Maelgrum wrote on 2023-10-03, 20:22:

Please give me some feedback - is it working ?
I have absolutely no means to test it.

OK, then, I will report back in 10-15 minutes, that should be enough time to be able to run in both on discrete and embedded card.

Maelgrum wrote on 2023-10-03, 20:22:

Please give me some feedback - is it working ?
I have absolutely no means to test it.

running some tests on my (presumingly) dodgy ct3600.

this is the first run. i will try different isa slots to confirm its weird behaviour.

same isa slot 2nd run directly after the first:

same isa slot 3rd run directly after the 2nd:

4th run: this time even an error...

5th run started without error...

Sb16dump V0.05
Experimental support for V4.04 and V4.05 added - test needed ))

mattw wrote on 2023-10-03, 20:24:

Maelgrum wrote on 2023-10-03, 20:22:

Please give me some feedback - is it working ?
I have absolutely no means to test it.

OK, then, I will report back in 10-15 minutes, that should be enough time to be able to run in both on discrete and embedded card.

works beautifully:

1DSP type  : integrated
2CRC32 (6k): 9E1B22C6 (known)
3Saved     : DSP_413I.bin
4Success!

1DSP type  : discrete
2CRC32 (6k): 9E1B22C6 (known)
3CRC32 (8k): E22E9001 (known)
4Saved     : DSP_413D.bin
5Success!

mattw wrote on 2023-10-03, 20:42:

works beautifully:

Excellent !
Thanks for testing ))

Any not known dumps will be saved as XXXXXXXX.413 (XXXXXXXX is CRC32 of 6k ROM).

DerBaum wrote on 2023-10-03, 20:25:

running some tests on my (presumingly) dodgy ct3600. this is the first run. i will try different isa slots to confirm its weird […]
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running some tests on my (presumingly) dodgy ct3600.
this is the first run. i will try different isa slots to confirm its weird behaviour.
same isa slot 2nd run directly after the first:
same isa slot 3rd run directly after the 2nd:
4th run: this time even an error...
5th run started without error...

Looks like you have some system error - on ISA bus or it is failing ROM in DSP.
Thanks for testing !

Maelgrum wrote on 2023-10-03, 20:22:

Please give me some feedback - is it working ?
I have absolutely no means to test it.

This was from week 9 1998 CT4180 card

maxtherabbit wrote on 2023-10-03, 20:48:

This was from week 9 1998 CT4180 card

Thanks, maxtherabbit ! ))

Maelgrum wrote on 2023-10-03, 20:45:

Excellent ! Thanks for testing )) […]
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mattw wrote on 2023-10-03, 20:42:

works beautifully:

Excellent !
Thanks for testing ))

Any not known dumps will be saved as XXXXXXXX.413 (XXXXXXXX is CRC32 of 6k ROM).

BTW, may I suggest to add CRC32(8K) for integrated as well and write, for example:

ViBRA16C known padding case

1CRC32 (8k): 1D7BF127(known padding)

or

CT2502 known padding case

1CRC32 (8k): A38CBCB2(known padding)

because currently we know 2 types of padding to 2K. IMHO, it's better in terms of completeness, also in weird cases when random bytes flip like in @DerBaum when reading the padding.

Can anyone test V0.05 on 4.04/4.05 ?

Maelgrum wrote on 2023-10-03, 20:52:

Can anyone test V0.05 on 4.04/4.05 ?

I will when my 8052 ICs and PLCC-44 socket arrive, i.e. burn old hardware dumps to a new 8052 chip and test that way, which will take weeks.

currently, I guess @appiah4 can do it on "CT17410 V405" card that reported earlier today.

mattw wrote on 2023-10-03, 20:52:

BTW, may I suggest to add CRC32(8K) for integrated as well and write, for example: […]
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Maelgrum wrote on 2023-10-03, 20:45:

Excellent ! Thanks for testing )) […]
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mattw wrote on 2023-10-03, 20:42:

works beautifully:

Excellent !
Thanks for testing ))

Any not known dumps will be saved as XXXXXXXX.413 (XXXXXXXX is CRC32 of 6k ROM).

BTW, may I suggest to add CRC32(8K) for integrated as well and write, for example:

ViBRA16C known padding case

Copy code to clipboard

1CRC32 (8k): 1D7BF127(known padding)

or

CT2502 known padding case

Copy code to clipboard

1CRC32 (8k): A38CBCB2(known padding)

because currently we know 2 types of padding to 2K. IMHO, it's better in terms of completeness, also in weird cases when random bytes flip like in @DerBaum when reading the padding.

Bro I'm pretty sure you are the only one here who cares about the padding bytes