Re: Early Covox uses:

Posted on 2020-12-28, 13:12

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

FreddyV wrote on 2020-12-27, 19:11: Speech synthesis hardware was doing the calculation, here, it is a simple DAC, the CPU will need to do everything and it may be too slow. Unless it's diphone concatenation. Then it's primitive.

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Re: Early Covox uses:

Posted on 2020-12-26, 20:02

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

kolderman wrote on 2020-12-26, 19:25: Does that Tandy laptop have Tandy sound? If not, one nice use of a COVOX plug is in emulating Tandy sound using TEMU. I doubt that a 7.16MHz machine will be able to run TEMU. Doesn't it need a 386?

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Re: Why is ADPCM so important?

Posted on 2020-12-26, 16:10

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

In my opinion the biggest advantage of the various types of adaptive differential pulse code modulation techniques is their relatively low complexity overhead compared to normal linear PCM or companded PCM. Typical variants allow you to save 50% space with relatively small quality loss. The IMA …

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Re: ATI Color Emulation Card

Posted on 2020-12-23, 22:15

by

by Benedikt

in Marvin \ Video

in Marvin \ Video

Good point! I missed that somehow. It just occurred to me that the switch settings might be similar to those of the ATI Graphics Solution. The following diagram is from its manual. (AGA is Commodore's OEM name for that card.) aga_switch_settings.png Assuming that the meaning of the individual …

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Re: How does onboard Soundblaster emulation work???

Posted on 2020-12-23, 10:55

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

Maybe this thread is what you are looking for: VIASBCFG - VIA SBPro configuration tool for VIA VT8231 & VT82C686/A/B chipsets (v0.12d)

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Re: Socket 5 - Dallas RTC replacement gone bad

Posted on 2020-12-23, 10:37

by

by Benedikt

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I guess it's time to go through the checklist: Did you work in an ESD-safe environment while handling the motherboard? How smoothly did the desoldering go? Could you have pulled out a VIA? Is the new RTC chip compatible and inserted the right way around? Does the keyboard work on a PS/2 port with an …

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Re: ATI Color Emulation Card

Posted on 2020-12-22, 13:24

by

by Benedikt

in Marvin \ Video

in Marvin \ Video

Interesting. So it does have the same gate array, just like I assumed. It is also not a pure color emulation card, because it clearly has a composite video header and there are too many traces running to the DE9 socket. There is no 16(.257)MHz oscillator, though, i.e. the MDA/Hercules pixel clock is …

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Re: Newly written driver(s) for Sierra's Creative Interpreter – Starting with Plantronics ColorPlus

Posted on 2020-12-15, 11:52

by

by Benedikt

in Marvin \ Video

in Marvin \ Video

I've thought about audio drivers, as well, but it does not have the highest priority, right now. Anyway, Ravi's Sound Drivers (also LGPL) would then be a good starting point.

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Re: Newly written driver(s) for Sierra's Creative Interpreter – Starting with Plantronics ColorPlus

Posted on 2020-12-13, 11:08

by

by Benedikt

in Marvin \ Video

in Marvin \ Video

NASM expects the prefix within the square brackets and with a colon as separator. Rewriting the offending line of code like this should work: Copy code to clipboard 1 mov [cs:.AddLine-2],ax But I'm not sure about self-modifying code in a dynamically loaded driver.

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Re: HP T5710 windows 98 build

Posted on 2020-12-12, 22:12

by

by Benedikt

in Marvin \ System Specs

in Marvin \ System Specs

I believe the Win98 drivers largely eliminate the BIOS-triggered beeping. In pure DOS, however, the system will beep whenever you press a few keys too many or whenever the keyboard buffer is full. With this type of built-in speaker at maximum volume the resulting beep comes closer to a smoke alarm …

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Re: Newly written driver(s) for Sierra's Creative Interpreter – Starting with Plantronics ColorPlus

Posted on 2020-12-12, 16:26

by

by Benedikt

in Marvin \ Video

in Marvin \ Video

With some of the driver functions I had to switch back and forth between rewritten code and disassembly to make sure that they are not identical by accident. Seriously, how many sensible ways to manage a cursor visibility counter are there? API and ABI are fixed after all.

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Re: Newly written driver(s) for Sierra's Creative Interpreter – Starting with Plantronics ColorPlus

Posted on 2020-12-12, 11:33

by

by Benedikt

in Marvin \ Video

in Marvin \ Video

Yes, you can, but not in a PC1512. Just create a generic XT with the same hard drive and a Plantronics card! The Color 400 option ROM does not work smoothly with every BIOS, so you might have to try a few configurations if you want to experiment with that driver, as well.

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Re: Newly written driver(s) for Sierra's Creative Interpreter – Starting with Plantronics ColorPlus

Posted on 2020-12-11, 19:00

by

by Benedikt

in Marvin \ Video

in Marvin \ Video

So I confirm, there are four plane, for R, V, B and I. 8 Pixel per Byte and a registry to write for each plan change. Also, duplicate the pixels as the Amstrad output is 640*200. Yeah. That is really the only extra video mode the PC1512 supports. The current driver is doing a good job, and is …

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Re: How does onboard Soundblaster emulation work???

Posted on 2020-12-10, 08:45

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

Unfortunately I cannot help you much. What I can tell you, though, is that NTVDM has nothing to do with it. NTVDM is just an emulation layer that redirects certain types of hardware access to Windows drivers. People who have enough knowledge to help you more will probably be interested in your …

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Re: HP T5710 windows 98 build

Posted on 2020-12-09, 17:48

by

by Benedikt

in Marvin \ System Specs

in Marvin \ System Specs

Small life hack: If the brutally loud beeper annoys you, but you don't want to mod the hardware, just grab a headphone plug from your parts drawer, plug it in and enjoy the silence! (The beeper is controlled by the sound chip, internally, and the sound chip will reroute everything to the audio …

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Re: Newly written driver(s) for Sierra's Creative Interpreter – Starting with Plantronics ColorPlus

Posted on 2020-12-09, 17:31

by

by Benedikt

in Marvin \ Video

in Marvin \ Video

I am interested to disassemble the PC1512 driver and optimize it, I may take a look and optimize these drivers as well, I see plenty of speed improvement that can be done :) (As You know, the PC1512 video is slow) Is there any of these video mode supported by DOSBox ? As keropi already said, use …

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Re: The comprehensive list of all modern reproductions of vintage sound cards

Posted on 2020-12-09, 15:20

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

Also non working dss clone is on the list, there is no firmware so it is no clone ;) How close is the DSS clone to working? I thought it was successfully tested at this point? My two-part DSS clone is completely untested. I never built it. It is on this list because the combined power supply and …

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Re: The 3 voice sound PCjr/Tandy 1000 games patching thread!

Posted on 2020-11-17, 13:51

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

But would it not better to make some sort of diff files and a patcher so there are no legal issues ? maybe in some countrys its illegal to distribute patched executables. I'd like to suggest the VCDIFF format as standardized by the IETF in RFC 3229. The most widespread implementation is the command …

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Re: Been thinking about trying my hand at DOS programming. What soundcards should I support?

Posted on 2020-11-09, 10:42

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

You'll get the best coverage with a combination of Sound Blaster, Windows Sound System and AC'97. This covers the majority of systems from the early to mid 90s, mid to late 90s and late 90s to 2000s. AdLib (OPL2) is also interesting, but then you'd have to include a synthesizer for the later sound …

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Re: HP T5710 windows 98 build

Posted on 2020-10-30, 13:44

by

by Benedikt

in Marvin \ System Specs

in Marvin \ System Specs

Jo22 wrote on 2020-10-30, 08:01: What about a stand-alone DOS, like Caldera DOS, FreeDOS or IBM DOS 7/2000? Does it work the same in this case as MS-DOS 7.x does? I have a working FreeDOS installation. It detects USB flash drives as ordinary hard drives, provided that they have been plugged in …

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