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Re: The Unofficial OPL2LPT and OPL3LPT demopack (for convienient testing of Adpatch)

Posted on 2021-04-10, 21:03

in Marvin \ Sound

in Marvin \ Sound

Thx guys. Using such a device on an Euro-PC is very cool solution. Beside that Plantronics also works on EuroPC, so getting patched SC0 adlib-drivers would lead in a really big catalog of working games on XT. On old adlib it was possible to play mod-files...can this be done on OPL3LPT too or is it …

Re: Cloning the AdLib Gold Surround Sound Module

Posted on 2021-04-10, 20:54

in Marvin \ Sound

in Marvin \ Sound

it'd be really fun to clone the Gold! i think the "Gold Ctrl" should be fairly straightforward to implement in an FPGA. or possibly a CPLD, if it is simple. the YMZ263 looks hard to find so it should also go into the FPGA. The Gold CTRL will definitely fit a small CPLD, the only real thing it does …

Re: Tandy 1000 TL/2 + Upgrades

Posted on 2021-04-09, 16:27

in Marvin \ System Specs

in Marvin \ System Specs

I think the best use case I've found for the computer so far are the old Sierra games up to SCI0. These all have good Tandy graphics and CMS support, and can also use EMS. There is an unofficial Tandy high-res driver for SCI1 VGA games, though: http://www.vcfed.org/forum/showthread.php?30424-Tandy …

Re: CGA composite colour driver for Space Quest 3 (and other Sierra SCI games)

Posted on 2021-04-07, 15:22

in Marvin \ Video

in Marvin \ Video

I guess there is only so much you can do when it comes to picture quality. But maybe you could try the opposite direction and try to turn existing dithering into solid colors – or coarser new dithering – by processing pairs of pixels at a time. This could help with SQ4.

Re: CGA composite colour driver for Space Quest 3 (and other Sierra SCI games)

Posted on 2021-04-01, 13:26

in Marvin \ Video

in Marvin \ Video

One thing I noticed is that the header on the actual driver has 3 extra bytes at the beginning of the file before the 'magic number' signature (00 21 43 65 87 00). Do you know what these are for? Any suggestions? That is a jump instruction to the dispatch routine. Execution starts right at the …

Re: CGA composite colour driver for Space Quest 3 (and other Sierra SCI games)

Posted on 2021-03-31, 21:50

in Marvin \ Video

in Marvin \ Video

Heck yes. EDIT: I tried this with the EGA SCI1.0 games and it works, but like the older official CGA drivers, it doesn't like scrolling screens. Which means it won't work for KQ1SCI either. That can be patched in. The newer version has an additional function, i.e. the scroll function, and a …

Re: CGA composite colour driver for Space Quest 3 (and other Sierra SCI games)

Posted on 2021-03-31, 16:11

in Marvin \ Video

in Marvin \ Video

jhhoward wrote on 2021-03-31, 14:14: To use, just add the CGACOMPO.DRV file to your game directory and edit the RESOURCE.CFG to read: videoDrv=CGACOMPO.DRV Does the driver not show up in the installer? I think it should, provided that you modified the strings in the file header.

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

Posted on 2021-03-30, 20:22

in Marvin \ Video

in Marvin \ Video

I am very impressed of the Plantronics driver Benedikt made. So i have made a video on the Plantronics on my EuroPC. Take a look: https://youtu.be/QbRq35s12yg Cool video! Beside that plantronics color plus support in those sierra-sci-games , what about the old AGI versions. Would it be possible too …

Re: TNDLPT : Tandy Sound on parallel port

Posted on 2021-03-18, 16:26

in Marvin \ Sound

in Marvin \ Sound

I purchased a TNDLPT from Serdaco but noticed that it didn't render the music in Maniac Mansion or Zak Mckracken quite right (the noise tracks dropped out). No fault of the TNDLPT design, it was actually because the original TI chips used in the PCJR and widely available for re-use in the TNDLPT …

Re: List of open-source PC hardware projects

Posted on 2021-03-16, 11:28

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Let's add a link to this thread just for completeness: The comprehensive list of all modern reproductions of vintage sound cards

Re: SAA1099 as 4-bit DAC and CMS/GameBlaster digital sound output

Posted on 2021-03-13, 18:17

in Marvin \ Sound

in Marvin \ Sound

I simply put a panel mount 3.5mm audio jack and an RC low-pass in a DE9 plug enclosure. The low-pass was pretty much necessary, but the SAA1099 is not limited to one bit precision.

Re: Is there a fix/workaround for the G400 and Commander Keen engine games?

Posted on 2021-03-13, 18:09

in Marvin \ Video

in Marvin \ Video

Is this related? Keen 4-5-6 choppy scrolling on EGA card

Re: SAA1099 as 4-bit DAC and CMS/GameBlaster digital sound output

Posted on 2021-03-13, 17:07

in Marvin \ Sound

in Marvin \ Sound

Could this be combined with Sigma/Delta modulation, i.e. error diffusion? I used it with a high-baud-rate serial port, once, and got audio output of roughly similar quality.

Re: CGA Replica / Potential New-Design CGA Card

Posted on 2021-03-13, 16:58

in Marvin \ Video

in Marvin \ Video

Maybe I should have clarified my question a bit more. From what I have understood of how the shared video memory in the Tandy 1000 (and the PCjr?) worked, is that it encompassed the first (lowest) 128KB of the conventional memory. And since (I assume) any existing on-board memory in most PC/XT …

Re: Unknown Soundcard

Posted on 2021-03-13, 16:48

in Marvin \ Sound

in Marvin \ Sound

this soundcard (i think it is one) is laying around here quite a while and i am wondering what brand/type it is. Googling was not successfull so far. Maybe some one on the Forum has a clue what it could be ? No idea about the brand, but the type of sound card is stupidly obvious: It's an AdLib …

Re: CGA Replica / Potential New-Design CGA Card

Posted on 2021-03-12, 18:25

in Marvin \ Video

in Marvin \ Video

FreddyV wrote on 2021-03-12, 13:55: You can check this 😀 https://www.andavno.com/?p=478 Yeah. We've been talking about his card. Incidentally, he also posted to the thread that is linked above a couple of days ago. According to his own words, he still plans to publish his design files at some point …

Re: CGA Replica / Potential New-Design CGA Card

Posted on 2021-03-12, 12:24

in Marvin \ Video

in Marvin \ Video

There is an interesting related thread on the VCFED forum for those that are interested.

Re: CGA Replica / Potential New-Design CGA Card

Posted on 2021-03-09, 22:22

in Marvin \ Video

in Marvin \ Video

I guess that makes another exact replica kind of pointless, unless you want to clone the other of the two versions. +1 for a more versatile super-CGA card. A CGA card with HGC+-style RAM font support would also be interesting. Or a HGC+ clone in general.

Re: Do you want an EGA monitor?

Posted on 2021-03-09, 21:45

in Marvin \ Video

in Marvin \ Video

The BIOS-less Hercules InColor scaled the MDA timings programmed by the system BIOS to something within the specifications of EGA monitors by replacing the 16.257MHz oscillator with a 19MHz oscillator. That trick should work with an MDA, too. By the way: The MDA can then technically output 16 colors …

Re: EGA/CGA card or ?

Posted on 2021-03-09, 21:33

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That being said, the digital RGBI signals from a CGA card or an EGA card in one of the 200-line modes can be converted to analog RGB with very little circuitry. The resulting analog signal is what the scaler board wants as input. If it wants a composite sync signal, add an XOR gate with hsync and …

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