Re: PiGUS: Gravis Ultrasound emulator on an ISA card with Raspberry Pi

Posted on 2022-06-17, 13:40

by

by carlostex

in Marvin \ Sound

in Marvin \ Sound

I agree this is a cool project but why not use an FPGA? FPGA design is not simple, and here, any part of DOSBOX or other software emulator can be used. On the other hand, a big enough FPGA, could support several sound cards as once. Synth chips like the OPL3, dual OPL2's could be done in FPGA, its …

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Re: Su 25 : Soviet Attack Fighter steering

Posted on 2022-05-27, 17:28

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by carlostex

in DOS

in DOS

has somebody any good advice for the best way to steer the plane? According to my experience (36 hours) of flying real airplane: 1. Keep an eye on airspeed. Don't let airspeed drop below stall speed +10 kts. 2. Too much bank. Try turning with not more than ±15° of bank. 3. Don't pull so hard on a …

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Re: Socket 5/7/SS7 clock multipler/divider interposer

Posted on 2022-05-26, 03:23

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by carlostex

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

i have a feeling we are making some assumptions here that won't pan out but I'm onboard with investigating and trying. I just won't be doing it on my hardware lol I eagerly await your attempt! :p will any kind of pcb help with the attempt? I could maybe throw something together real quick. but just …

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Re: Socket 5/7/SS7 clock multipler/divider interposer

Posted on 2022-05-26, 01:16

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by carlostex

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I said run it to the clock gen not to the crystal. We said the same thing I think. Anyway, there is usually a 12 or 14mhz clock for the kb clock on the clock gen chip (pll) You could use a coaxal cable maybe btw. Like a wifi cable? Help insulate from interference. Ground the jacket, use the core …

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Re: Socket 5/7/SS7 clock multipler/divider interposer

Posted on 2022-05-26, 00:25

by

by carlostex

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The fastest way to test this is probably to de solder the clock pin on a pentium mmx and run a boge wire from it to the reference or kb clock on the clock gen. And boom, your fsb goes from 50/66mhz to 14 mhz You can't just run a bodge wire into the reference clock. The 14.318Mhz crystal does not …

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Re: Socket 5/7/SS7 clock multipler/divider interposer

Posted on 2022-05-24, 05:37

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by carlostex

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This is a investigation thread continuing a conversation that started here: https://www.vogons.org/viewtopic.php?p=1073569#p1073569 The thought and Idea has come up many times, including myself, but I don’t know if anyone has ever investigated it in a long winded research thread. I need to …

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Re: Socket 5/7/SS7 (Processor) Tweaker

Posted on 2022-05-24, 01:59

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by carlostex

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I believe that making it external would possibly have to tap and sever all the bus lines, translate it to a higher clock somehow, then attach to the cpu. My hipothetical idea is to divide the clock just before it touches the CPU. Dividing the 50MHz bus, let's say by 2, before the CPU and send it to …

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Re: Socket 5/7/SS7 (Processor) Tweaker

Posted on 2022-05-23, 05:42

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by carlostex

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It might be possible to use a device like this to disable L2 cache. but the mobo usually has a setting for that. however, I may have a clock related alternative for you. Many cyrix chips included a 1x multiplier setting that coincidentally, this tweaker can be used to set on older motherboards. …

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Re: Socket 5/7/SS7 (Processor) Tweaker

Posted on 2022-05-23, 05:04

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by carlostex

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've been wondering if, one could use something like this to actually lower the final clock of a CPU. Like adding a 2 and 4 divider for the FSB just before the clock hits the CPU. The benefit of this would be to make a Socket 7 CPU much better suited for older games. For instance, setting the FSB on …

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Re: Evaluating V3 sound midi module for DOS gaming purposes

Posted on 2022-05-21, 22:52

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by carlostex

in Marvin \ Sound

in Marvin \ Sound

RetroGamer4Ever wrote on 2022-05-21, 20:20: https://www.youtube.com/playlist?list=PL7jdw7 … Ri23PjPTaa-EiRu Jurassic Park does indeed sound anything but impressive. There's an XG version of that piece that sounds incredible even on a low tier XG module like a MU10.

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Re: Tandy 2500 XL "C0 to 1E0" patching

Posted on 2022-05-19, 06:47

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by carlostex

in Marvin \ Sound

in Marvin \ Sound

I can't recall exactly from memory, but most of the mentioned games in the OP are out c0h, al which is basically a 2 byte instruction. Patching to 1E0h is more involved: mov dx, 1e0h out dx, al 4 bytes right there. Unless there's a couple of NOP's in the sound subroutine it will be a gargantuous or …

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Re: Castle Wolfenstein on a Pentium 133 (all cache disabled)

Posted on 2022-05-16, 16:35

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by carlostex

in DOS

in DOS

So, it will never run on my machine? Unless I use an emulator or something? It will run but will have issues because it was intended to be play on the original IBM PC or equivalent. Maybe if you use ATSLOW (and all caches disabled) with /t120 parameter you can get it to run at an acceptable speed.

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Re: DOS file size limit

Posted on 2022-05-16, 16:30

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by carlostex

in DOS

in DOS

I'm using 4DOS version 7.50, despite my DOS 7.1 installation recognizing files bigger than 2GB i can't do anything with them, MOVE or COPY commands don't work for instance. I guess these commands need to be patched to support the INT 21 AX=6C00 function. I wonder if Jason Hood, author of SHSUCDX and …

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Re: Castle Wolfenstein on a Pentium 133 (all cache disabled)

Posted on 2022-05-14, 23:24

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by carlostex

in DOS

in DOS

Castle Wolfenstein requires an 8088 at 4.77Mhz to play as intended

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Re: DOS file size limit

Posted on 2022-05-14, 10:07

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by carlostex

in DOS

in DOS

Is it DOS that gave the issue, or some app? Because the 2GB limit might come as the result of using signed integer for file pointers within the app. The half of the theoretically supported size would be lost to the sign bit within the app's implementation. I used MTCP's FTP tool to transfer the …

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DOS file size limit

Posted on 2022-05-14, 09:28

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by carlostex

in DOS

in DOS

I've been rocking out a FAT32 137GB maxed (that's all my BIOS can see) out DOS "7.1" installation for a while now and i can't complain too much. Recently i decided to add a second hard drive with a couple of partitions. One partition is FAT16, due to some incompatibilities with FAT32 and some games. …

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Re: OPNA (YM2608) based soundcard for IBM PCs and compatibles possible?

Posted on 2022-04-30, 07:12

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by carlostex

in Marvin \ Sound

in Marvin \ Sound

I don't know the chip, but it should be possible. You need to be careful how you expose all the I/O into the ISA bus, check if something like the 240 to 25F range is enough for all registers, and if you need IRQ and DMA for the PCM stuff. The big question here is that you need software development …

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Re: Using Creative Goldfinch

Posted on 2022-04-30, 06:49

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by carlostex

in Marvin \ Sound

in Marvin \ Sound

On my Sonic ecstasy rig i use any Orpheus which is only SB Pro compatible. Works fine. I recommend UNISOUND to enable the Goldfinch. Only drawback is that games with DMX Sound system refuse to play AWE if they don't detect a SB16. DOOM and Raptor: Call of the Shadows are the prime examples. FastDOOM …

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Re: Bought these (retro) hardware today

Posted on 2022-04-27, 09:43

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by carlostex

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Anyhow does anyone know good sounding wavetable hardware that'd blow xg away? thats nice and cheap? plz let me know. I don't. I haven't heard anything General MIDI yet that beats XG optimized away. Sure, for DOS games that mostly used Roland Sound Canvas the X2GS is the cheapest and best around …

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Re: MK8330 : new soundcard based on the CMI 8330 chipset

Posted on 2022-04-19, 20:56

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by carlostex

in Marvin \ Sound

in Marvin \ Sound

Hello there! I've been beta testing a prototype of this card, and it's simply the best CMI8330 implementation i've ever put my hands on. It does SB, SB Pro, SB16 and WSS. Want something more? Add the optional MPU-401 daughtercard addon and make it perfect. Think about this: You have a motherboard …

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