Re: BlasterBoard 2.0 : A modern SB 2.0-compatible ISA sound card

Posted on 2019-02-17, 23:25

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by LABS

in Marvin \ Sound

in Marvin \ Sound

Hello, there! Finally had time to finish the prototype: bb_proto.jpg The digital part is on the left and analog part - a 4-channel mixer and amplifier - on the right. As seen it has 4 dedicated volume knobs for every sound source and one stereo output jack. The output has a delayed unmute circuit, …

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Re: BlasterBoard 2.0 : A modern SB 2.0-compatible ISA sound card

Posted on 2018-10-31, 12:45

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by LABS

in Marvin \ Sound

in Marvin \ Sound

Ok, a production variant of a 2-layer PCB is ready in copper. Now I need to drill a lot of <1mm holes to finish it. As I don't have a drill press in my workshop - all holes for previous prototypes were 1mm and were drilled by hand. But now I need to replicate the production PCB and there are a lot …

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Re: BlasterBoard 2.0 : A modern SB 2.0-compatible ISA sound card

Posted on 2018-10-02, 18:51

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by LABS

in Marvin \ Sound

in Marvin \ Sound

Just received some fresh OPL2s 😀 Filename P1010611.JPG File size 64.64 KiB Views 1433 views

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Re: BlasterBoard 2.0 : A modern SB 2.0-compatible ISA sound card

Posted on 2018-10-01, 20:20

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by LABS

in Marvin \ Sound

in Marvin \ Sound

Are you sure your IOCHRDY was implemented for READ operations as well ? If the software was designed with OPL2 in mind, they supposed to implement fake reads to slow down IO process, and if tou get just a few us for each fake read, it should be enough. Yes, FIFO could be an answer, but without CPLD …

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Re: BlasterBoard 2.0 : A modern SB 2.0-compatible ISA sound card

Posted on 2018-10-01, 18:23

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by LABS

in Marvin \ Sound

in Marvin \ Sound

When you run something like Ultima 6 or Prince of Persia on a too fast PC - the music is a mess, nevertheless some notes do reach OPL2, so the same is here. Have you tried older “real” SB on your PCs ? If they behave the same, relatively simple wait-states circuit should help... Actually I was …

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Re: BlasterBoard 2.0 : A modern SB 2.0-compatible ISA sound card

Posted on 2018-10-01, 17:20

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by LABS

in Marvin \ Sound

in Marvin \ Sound

At what moment is it happening ? Just after "Test Menu" -> "Sound Output" PC XT Actually, it's strange - I assume there is only discrete logic in the circuit (no MCU involved) ? No MCU. When you run something like Ultima 6 or Prince of Persia on a too fast PC - the music is a mess, nevertheless …

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Re: BlasterBoard 2.0 : A modern SB 2.0-compatible ISA sound card

Posted on 2018-10-01, 15:30

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by LABS

in Marvin \ Sound

in Marvin \ Sound

I just tried with my SB1350B and a 486DLC (386DX) setup, when IT starts and reports the card it detected I get 3 clicks - maybe your p1 system being faster does that quicker and it sounds like a single click. Made a quick video of it, you can hear the 3 clicks at startup, there is also a single one …

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Re: BlasterBoard 2.0 : A modern SB 2.0-compatible ISA sound card

Posted on 2018-10-01, 11:42

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by LABS

in Marvin \ Sound

in Marvin \ Sound

Hi, maybe I can help. I've got an older SB2.0 model (+CMS option) for testing, but it is installed in a 286 currently, which can't run IT. May I ask which kind of computer do you prefer for testing ? 386 or Pentium 133 PC ? :) Best regards, Jo22 Thanks a lot, Jo22! P133 is closer to my workbech …

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Re: BlasterBoard 2.0 : A modern SB 2.0-compatible ISA sound card

Posted on 2018-09-28, 21:52

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by LABS

in Marvin \ Sound

in Marvin \ Sound

Hey guys, can anyone check please if Impulse Tracker 2.14 makes a single click on startup screen with SB 2.0 or any other old SB? I have a click and I logged it's communication with the card and found nothing fancy there - usual DSP resets, set time constant (0x40), turn speaker on (0xD1), set DMA …

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Re: BlasterBoard 2.0 : A modern SB 2.0-compatible ISA sound card

Posted on 2018-09-26, 10:43

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by LABS

in Marvin \ Sound

in Marvin \ Sound

A few more question: what quality will the PCB be? Tin or gold plating? What solder stop? How much copper? Can you estimate a price? I guess you will make at least 10 kits. Yellow soldermask and ENIG surface finish. Estimation is very rough so it is too early to say - it has a lot of components and …

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Re: Doom 'MBF' for DOS, Maintenance release 2.04

Posted on 2018-09-25, 11:58

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by LABS

in Release Announcements

in Release Announcements

Hello, does MFB support CD music playback?

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Re: BlasterBoard 2.0 : A modern SB 2.0-compatible ISA sound card

Posted on 2018-09-25, 11:05

by

by LABS

in Marvin \ Sound

in Marvin \ Sound

Regarding tests: demo scene productions might be worth a try. Like Panic, Second Reality and the like. But if Screamtracker works, they will probably work as well. Did you try Windows 3.x? Yes, I should definately try more demos and Win 3.1. Win 98 however works fine. But just tried Diablo which …

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Re: BlasterBoard 2.0 : A modern SB 2.0-compatible ISA sound card

Posted on 2018-09-25, 08:22

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by LABS

in Marvin \ Sound

in Marvin \ Sound

Looks awesome! Definitely interested in a PCB. Can you make it compatible with the Keystone ISA bracket? (https://www.digikey.de/product-detail/de/keystone-electronics/9202/36-9202-ND/608463) That bracket is still in production and one can easily drill holes for audio ports or potentiometers. A …

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Re: BlasterBoard 2.0 : A modern SB 2.0-compatible ISA sound card

Posted on 2018-09-24, 22:47

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by LABS

in Marvin \ Sound

in Marvin \ Sound

Hi there, I finally finished the prototype! Now it has completely new mixer, output filter and noiseless power supply (breadboard on the left). P1010599.JPG The card has 4 sound sources: 1) An 8-bit mono sample playback channel, which is fully compatible with SB 2.0 API, ThunderBoard API and has …

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Re: Sound Blaster 2.0 project & IRQ from OPL2

Posted on 2018-09-24, 16:33

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by LABS

in Marvin \ Sound

in Marvin \ Sound

keropi wrote: great news! does it also support ADPCM for the odd game like Duke Nukem 2? Sure it does!) I will make an open firmware. ATmega is running on 20MHz, so there are resources available for experiments and custom stuff.

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Re: Sound Blaster 2.0 project & IRQ from OPL2

Posted on 2018-09-24, 16:12

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by LABS

in Marvin \ Sound

in Marvin \ Sound

Very nice. When can we order it? :) It will be available in 2-3 weeks. Hi! Very cool project! What does it sound like compared to the old SB2? Does the modern op-amps give less noise? The noise issue was the challenge of the last month and it was not the old opamp's problem in SBs, but PC power …

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Re: Sound Blaster 2.0 project & IRQ from OPL2

Posted on 2018-08-20, 23:34

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by LABS

in Marvin \ Sound

in Marvin \ Sound

Most games only output sound at 11025kHz, which would require only half the bandwidth you describe, which would be feasible over an LPT port, possibly even on a 386 machine, even when combined with something like OPL2/OPL3 on the same port, perhaps through some kind of latching mechanism in the …

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Re: FMonster, the monster of sound synth

Posted on 2018-08-20, 23:13

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by LABS

in Marvin \ Sound

in Marvin \ Sound

I don't get why I should use two ICs (and introduce new one into the BOM - 4075) for 12-bit decoding, when I already have 14-bit decoding with just one 74HC138? It is one IC for the whole board and all blocks have their own address decoders, different from each other. :confused: When I guess I …

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Re: FMonster, the monster of sound synth

Posted on 2018-08-19, 21:20

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by LABS

in Marvin \ Sound

in Marvin \ Sound

Using YM3812 in SOP24 might save some more space f_4981741e042d4aa2b6261d9b6ccefcce.jpg EDIT: For decoding 12-bit address for space saving you can use only 2 ICs - one 74x138 and one 74x4075 (triple 3-input OR): Route all constant 0s to 2 of 4075's ORs (A1, A2, A4, A6, A10, A11), output them to 3rd …

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Re: DOSBox debugger

Posted on 2018-07-25, 21:43

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by LABS

in DOSBox Development

in DOSBox Development

Is there a way to dump code overview to a file?

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