Re: Getting Windows 3.0 to use 256-colors VGA display?

Posted on 2016-05-18, 16:08

by

by Jepael

in PC Emulation

in PC Emulation

At 320x200 resolution? Never seen that before. But if you can make it support SVGA or VESA there are well documented ways to do that. VGA won't do 256 colors at a resolution sufficient for a GUI such as Windows, if I'm not mistaken. Does 360x480 at standard VGA refresh rates count? Sure it is …

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Re: OPL2 (Adlib) frequency of 0 and Output level to use PCM?

Posted on 2016-05-18, 15:22

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by Jepael

in PC Emulation

in PC Emulation

I think the numbers have been discussed in other threads already, but I'll mention the specs again: -In melodic mode, OPL2 has 9 channels with 2 operators each, so 18 operators in total. -Maximum amplitude of a single operator is 4084 -Maximum value you can fit into 16-bit signed integer is +32767 …

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Re: No sound output from Compaq Ultra-sound 32

Posted on 2016-05-17, 21:05

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Update : Upon closer inspection, it would appear that some pressure was applied on some components of the card during shipping. It would appear that the transistor in the lower left corner of the card (refer pic in previous post), just above C147 and the 16-bit part of the connectors, has …

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Re: Can anyone help me fix my PC-Adlib emulation?

Posted on 2016-05-16, 11:13

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by Jepael

in PC Emulation

in PC Emulation

Just thought about something: the documentation says the gain is added to the logsin. But the formulas given for volume are unsigned(positive) values((Attenuation<<5)+(VolEnv<<3)). When this is added to the LogSin, it would only make the signal louder instead of attenuating it. Thus the addition is …

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Re: S3 AGP Cards (and possibly others) Too Bright

Posted on 2016-05-13, 19:56

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by Jepael

in Marvin \ Video

in Marvin \ Video

3C4h index 8h = unlock extended sequencer, load xxxx0110b to unlock. Unlocks register indices 9h-1Ch. This info from other S3 chips. But yes, no information on what bit 5 of the register index 1Ah does on these chips. Does anyone have datasheets?

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Re: OPL2 (Adlib) frequency of 0 and Output level to use PCM?

Posted on 2016-05-12, 21:48

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by Jepael

in PC Emulation

in PC Emulation

Just thought about something: If you stop all operators at maximum volume(all 18 operators) and have the chip in Additive Synthesis mode, you'll get 18 crude '6-bit' audio channels using PCM audio! That's about 16 Covox Speech Things at 49kHz right there! Is this actually workable on those old PCs( …

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Re: Strange ISA soundcard - any idea? PRODIF 24

Posted on 2016-05-11, 18:54

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by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I bet no DOS game would support that.

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Re: Question about non-Intel bus speeds

Posted on 2016-05-11, 18:52

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by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

K6-2 mainboards also used 83, 95 or 97 fsb bus speeds. (As well as the standard 66 and 100) Did the odd bus speeds cause hardware problems or incompatibilities due the mobo's clocks being on a synchronized bus? I had Asus T2P4 motherboard. It officially supported FSB speeds up to 66 MHz, but with …

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Re: Can anyone help me fix my PC-Adlib emulation?

Posted on 2016-05-10, 18:49

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by Jepael

in PC Emulation

in PC Emulation

The thing I'm wondering about: 1. Does the FM modulation actually use PI as it's factor (looking at the ranges possible in feedback)? I'm assuming it actually uses PI to multiply into it's final result for phase modulation? 2. Is the range when selecting PI(value 5) as feedback a feedback value of …

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Re: Hissing/nosy sound card.

Posted on 2016-05-08, 20:12

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by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have a opl2 sound card with a nosy output. Would a recap help with cleaning up the sound output at all? Which sound card would that be? I believe changing the electrolytics won't help much. Only certain electrolytic caps filter power supplies, the rest of them are there for other purposes and …

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Re: Just an Idea: Why not a DosBox-Partner-Project for Windows 32bit-Games?

Posted on 2016-05-07, 13:53

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by Jepael

in PC Emulation

in PC Emulation

collector wrote: If only Wine for Windows was more mature. ReactOS uses Wine libraries quite heavily. You should test if it can run your games and programs.

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Re: Motherboard stuck at reset

Posted on 2016-05-01, 19:44

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, try another power supply. Another thing is, check CMOS battery. Disconnect it for some time, and make sure it is not empty and even try booting without battery.

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Re: Reddish color problem with LCD screen

Posted on 2016-05-01, 19:41

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is there a setting in BIOS called "Palette Snoop"? If so, make sure it is set to "disabled".

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Re: Amstrad Adlib Clone: Restoration and Testing

Posted on 2016-04-30, 22:47

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I know nothing about FM tracking - did a lot of composition back in the day with my GUS but have only recently heard about the Adlib connection. Where can I find out more? OPLx (vogon member) has listed many OPL2 trackers on his website http://oplx.com/opl2.htm . If I had to name one song to play …

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Re: Can anyone help me fix my PC-Adlib emulation?

Posted on 2016-04-29, 17:52

by

by Jepael

in PC Emulation

in PC Emulation

Anyone knows how to fully apply the volume? At what point is it added? After the Exponential table? Before the Exponential table(to the value read from the LogSin table)? To the raw index into the LogSin table(doubt it, because it only would deform the signal(not apply volume), thus giving …

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Re: Can anyone help me fix my PC-Adlib emulation?

Posted on 2016-04-28, 17:32

by

by Jepael

in PC Emulation

in PC Emulation

Yes. 😀

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Re: Raw reads from PS/2 port

Posted on 2016-04-28, 17:15

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There are no optocouplers on MIDI outputs, and 31250 is perfectly standard uart speed with zero error when using 16 MHz clock source, affected only by the clock source tolerance. MIDI specs require 1% baud rate tolerance, usually Arduinos have ceramic resonators and those should be within 1% …

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Re: MDA, Hercules and other clones, what's the frequency, Kenneth?

Posted on 2016-04-26, 18:10

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by Jepael

in Milliways

in Milliways

Graphics: ~23440 ticks Text: ~23923 ticks Total pixels: Graphics: 864*370 = 319680 Text: 882*370 = 326340 I don't own a Hercules card, but I find the graphics value quite odd. The last time I did research about the register values, the horizontal total is 98*9=882 in text mode, and it should be 110 …

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Re: Can anyone help me fix my PC-Adlib emulation?

Posted on 2016-04-24, 19:52

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by Jepael

in PC Emulation

in PC Emulation

I've not very knowledgeable about the rhythm mode, but the RNG may be applied differently to each channel because each rhythm instrument needs different timbre. At least in one very simple test case which I don't remember, the RNG was just xoring a certain phase bit, so the real chip matched what …

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Re: Need help identifying multi I/O and a sound card

Posted on 2016-04-22, 20:00

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by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The MP452 card uses a SIS 82c452 chip which is almost identical of many xx16c452 chips like on your other parallel card. Actually it appears that the "bidirectional" in that case means the data written to parallel data bits are readable. I don't know if it means that the external device can forcibly …

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