Re: Sound Blaster 16 Bugs and Deficiencies Summary

Posted on 2020-07-07, 14:04

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Does the CT1745A mixer operate at line-level? I know it's an analogue mixer, but I want to know where the analogue signal is modified. I assume the volume control is inside the CT1745A? That chip certainly plays a role as all the signal go through it, it is what applies the volume controls etc. and …

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Re: What do these pins mean? (ESS Solo 1 ES1938S)

Posted on 2020-07-05, 12:58

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

"Side band" should be for PC/PCI aka SBlink header, to gain better ISA compatibility for DOS games. "I2S IN" is a form of digital sound input and the "mono" should be an additional analog input. You need jumpers on J12+13 to have sound output, preferably in Line setting as it is less noisy and …

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Re: Zilog Z80 drop-In Replacement

Posted on 2020-07-03, 13:58

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

MSX TurboR machines have something that sort of fits the bill, no pin compatibility though...

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Re: What are the hurdles to creating a PCI Adlib sound card?

Posted on 2020-07-01, 17:57

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Whoops, fixed that. No such chips exist. The wavetable aspect is simply hooking stuff to the MIDI TX signal and mixing the analog output to your final output. Typical waveblaster setup that every card can support that has a MIDI UART present.

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Re: What are the hurdles to creating a PCI Adlib sound card?

Posted on 2020-07-01, 06:47

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Of course there must be responses possible, otherwise games cannot detect the FM chip. FIFO would be one way to reduce overheads, but then you begin to enter FPGA territory for things. It isn't a super trivial thing to do, which is why nobody has done it yet but it certainly is possible to do. …

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Re: GamepadDB15 : use Atari/C64/Sega joystick/gamepad as PC joystick

Posted on 2020-06-28, 13:49

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I suppose it will not work with Mega Drive pads ?

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Re: OAK OTI077 ISA and ram upgrade question

Posted on 2020-06-27, 17:18

by

by Tiido

in Marvin \ Video

in Marvin \ Video

I guess the 80ns chips aren't ok, or at least one of them isn't if the video test fails. The known working 70ns parts not allowing things to work is stange though, there shouldn't be any additional conf necessary for extra memory either.

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Re: OAK OTI077 ISA and ram upgrade question

Posted on 2020-06-27, 12:53

by

by Tiido

in Marvin \ Video

in Marvin \ Video

Yeah, those 70ns parts on the ATI card are running at 80ns, so the extra speed is getting wasted. You could definitely do the juggle.

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Re: OAK OTI077 ISA and ram upgrade question

Posted on 2020-06-27, 12:39

by

by Tiido

in Marvin \ Video

in Marvin \ Video

The 80ns memories should work but you might experience some minor graphical corruption (wrong pixels and such) occasionally, especially in elevated temperatures.

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Re: Addonics A151-910 YMF718-S Card Resource Conflicts

Posted on 2020-06-27, 01:28

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Ok, this is good news, I'm happy things finally work ~ I will have to slow down the timings of EEPROM writes then, or add a new parameter to kick in slower timings in case of similar sort of troubles.

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Re: What are the hurdles to creating a PCI Adlib sound card?

Posted on 2020-06-27, 01:25

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

It wouldn't be too difficult to make such a thing, it actually is something I have thought of doing as part of exercise to get familiar with PCI on low level but I haven't actually made any attempts yet since there's a bunch of other things I have to finish first. It is possible to have a CPLD that …

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Re: Addonics A151-910 YMF718-S Card Resource Conflicts

Posted on 2020-06-25, 23:44

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Did SETYMF find the card prior to writing the EEPROM or did you always need /FORCEPNP option ? Disabling caches is certainly worth to try. The EEPROM chips are somewhat timing sensitive and there is no sort of ready/busy monitoring facility so I simply used a long enough delay that seemed to work …

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Re: Addonics A151-910 YMF718-S Card Resource Conflicts

Posted on 2020-06-25, 10:54

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

The card will still use two IRQs, and the subdevices on it need 3 if taken separately as WSS/SB/MPU leading to conflict within the subparts when not using the Yamaha's driver which uses single IRQ for all 3. DMA is also similarly affected, SB uses one and WSS wants 2, and 1 of them is always shared …

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Re: Addonics A151-910 YMF718-S Card Resource Conflicts

Posted on 2020-06-25, 04:54

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

It is unfortunate you have had such bad luck with the sound card. The dent in the 33MHz crystal is not fatal, otherwise the card would be completely non functional. Now EEPROM not getting written is a new one to me, in theory the function that does it shouldn't be speed sensitive and I haven't …

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Re: ESS Maestro-2 Win 98 Drivers? + DOS/Win3.11 working kind of!

Posted on 2020-06-23, 00:56

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

This worked : http://www.tmeeco.eu/9X4EVER/GOODIES/ESS1968%20Maestro2.rar

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Re: Success: Adding a PS/2 mouse port to the Shuttle HOT433 (using a dedicated keyboard controller chip)

Posted on 2020-06-22, 23:05

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That's a really great effort, very awesome ~ I'm hoping to get a UMC8886/1 based board soon, I will come back to this thread at some point then.

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Re: Success: Adding a PS/2 mouse port to the Shuttle HOT433 (using a dedicated keyboard controller chip)

Posted on 2020-06-22, 21:43

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm wondering, do you have any documentation about these chipsets ? You mention strap pins etc. Nice work ~

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Re: All the truth about FM in ALS100 Plus+ cards (includes facts, tech info and tests)

Posted on 2020-06-20, 16:37

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Hahaha, this is really great ~ Very nice work !

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Re: Modern graphics on a 486

Posted on 2020-06-19, 02:58

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm pretty sure some video BIOSes want Pentium or newer instructions, but it isn't something I have ever tried to verify.

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Re: S3 Trio64V+ Memory upgrade

Posted on 2020-06-17, 18:42

by

by Tiido

in Marvin \ Video

in Marvin \ Video

That chip should work fine. You must line up pin1 of socket and chip, if not you'll burn out the chip and probably damage the card also. Chip fits both ways so care is necessary.

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