DOS-compatible Descent 1 and 2 source ports?

Posted on 2025-04-14, 18:12

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by megatog615

in Marvin \ Software

in Marvin \ Software

I have been looking for a source port of Descent available for DOS. I know it sounds strange at first but there are many quirks about the original 1.5 DOS release of Descent that make it difficult to run on systems with too much memory(Descent 1 seems to use EMS) or other CPU-related things. The …

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Re: COM Ports on Tomato/Zida 4DPS

Posted on 2025-04-10, 03:20

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by megatog615

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

geekretro wrote on 2025-02-08, 12:41: This is the COM1 from the separate ISA card right now, this is working as alternative solution from using the one onboard. Thanks for the info! I will keep them as useful info Meanwhile, my ebay seller of the 4dps told me he will send me a cable to use with …

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Re: Need help bypassing amplifier on ES1868F-based card

Posted on 2025-04-04, 20:00

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by megatog615

in Marvin \ Sound

in Marvin \ Sound

I'm pretty sure you also need to disconnect the outputs of the amp chip before things begin to work correctly. Pins 1 and 3 are the outputs. I moved the resistors and cut pins 1 and 3 off the amplifier. I only get right-channel mono sound. Descent setup puts right and center on the right and …

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Re: Need help bypassing amplifier on ES1868F-based card

Posted on 2025-04-04, 19:47

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by megatog615

in Marvin \ Sound

in Marvin \ Sound

Okay, through some quick testing I was able to figure out that the 2.2k resistors were the best for volume. Here's my (ugly) work. Ignore the lifted pad on R11, I don't know where that came from(he lied). I get stereo sound and the card is now poly-modded.

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Re: Need help bypassing amplifier on ES1868F-based card

Posted on 2025-04-04, 16:54

by

by megatog615

in Marvin \ Sound

in Marvin \ Sound

I'm pretty sure you also need to disconnect the outputs of the amp chip before things begin to work correctly. Pins 1 and 3 are the outputs. I moved the resistors and cut pins 1 and 3 off the amplifier. I only get right-channel mono sound. Descent setup puts right and center on the right and …

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Need help bypassing amplifier on ES1868F-based card

Posted on 2025-03-17, 07:28

by

by megatog615

in Marvin \ Sound

in Marvin \ Sound

I'm attempting to bypass this card's amplifier so it doesn't sound so terrible. At first I thought it would be straightforward, moving the resistors from R9 and R11 to R8 and R18 but that resulted in no audio output at all. I'm tempted to just desolder all of these SMD components around the amp chip …

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Re: PicoMEM : Pi Pico on ISA, with full Memory and I/O bus access

Posted on 2025-02-24, 02:47

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by megatog615

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

How exactly are you doing it? You need to remove the PicoMEM from the motherboard (can't stay in the computer even when powered down). Then attach the USB cable to the PicoMEM, press the BOOTSEL button and then attach the USB cable to your desktop. Keep the BOOTSEL button pressed the whole time btw …

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Re: VLB OD6500A Multi IO IDE Controller Card Bios Chip

Posted on 2025-01-16, 14:10

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by megatog615

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Which one? 74LS244 or 74LS138?

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Re: VLB OD6500A Multi IO IDE Controller Card Bios Chip

Posted on 2025-01-16, 13:13

by

by megatog615

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So you didn't need the 74LS chips?

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Re: VLB OD6500A Multi IO IDE Controller Card Bios Chip

Posted on 2025-01-14, 16:21

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by megatog615

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

douglar wrote on 2025-01-14, 13:59: megatog615 wrote on 2025-01-14, 13:55: Have you tried with a 28C64? Because you dont want you use more upper memory thatn necessary? no because it's all I have 😅

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Re: VLB OD6500A Multi IO IDE Controller Card Bios Chip

Posted on 2025-01-14, 13:55

by

by megatog615

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Have you tried with a 28C64?

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Re: VLB OD6500A Multi IO IDE Controller Card Bios Chip

Posted on 2025-01-14, 00:07

by

by megatog615

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ah, I am trying with a Atmel 28C64 like you did and I'm getting nowhere. I have these 74LS chips coming from Mouser. Turns out they're extremely cheap, around a dollar a piece.

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Re: VLB OD6500A Multi IO IDE Controller Card Bios Chip

Posted on 2025-01-13, 01:48

by

by megatog615

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi. Sorry to necro, but did you ever get this working after the chips arrived? If so, I want to send this information to The Retro Web's page for this card so other users can know. I am also trying to get XT-IDE to work with this card.

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2025-01-07, 01:56

by

by megatog615

in Marvin \ Sound

in Marvin \ Sound

digger wrote on 2025-01-07, 00:47: don't those Vortex86 SBCs have PC/104 interfaces, which are basically ISA slots in a different form factor? Not all of them. Some of them are even smaller and lack any sort of expansion.

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2025-01-06, 22:57

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by megatog615

in Marvin \ Sound

in Marvin \ Sound

Can SBEMU output to Covox/LPT-based dumb sound adapters? Asking because lots of Vortex86-based SBCs are very powerful but lack sound support. They do have parallel port headers though.

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Re: What retro activity did you get up to today?

Posted on 2024-10-30, 03:59

by

by megatog615

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Tried to boot Windows 98 SE with iSCSI off my NAS by booting on real hardware with iPXE. I followed this tutorial and adapted it to try to start Windows. I managed to install Windows but could not get past the first boot splash screen with a Windows Protection Error. It was also dreadfully slow- …

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Re: UNISOUND - Universal ISA PnP Sound Card Driver for DOS v0.81b

Posted on 2024-10-03, 15:28

by

by megatog615

in Marvin \ Sound

in Marvin \ Sound

Try with /CL to list all pnp cards then /C followed by the card number to initialize the right card. /CL lists Card #1 [CSC8025] Onboard PnP Audio, and Card #2 [GVC5C19] LT Win Modem. /C1 gives me the same error "Unknown PnP card [CSC8025] found.". It's detecting the CS4235 as a CSC8025 (which I …

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Re: UNISOUND - Universal ISA PnP Sound Card Driver for DOS v0.81b

Posted on 2024-09-21, 11:28

by

by megatog615

in Marvin \ Sound

in Marvin \ Sound

Try with /CL to list all pnp cards then /C followed by the card number to initialize the right card.

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Re: UNISOUND - Universal ISA PnP Sound Card Driver for DOS v0.81b

Posted on 2024-09-19, 22:23

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by megatog615

in Marvin \ Sound

in Marvin \ Sound

AirIntake wrote on 2024-09-19, 21:52: My IBM Aptiva E2N 2153 has an onboard Crystal CS4235-KQ. It works fine in Windows 98 and DOS using the drivers pv2860.zip from Philscomputerlab.com. It doesn't get detected by Unisound though, giving me the error "Unknown PnP card [CSC8025] found. Aborting...". …

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2024-05-31, 00:04

by

by megatog615

in Marvin \ Sound

in Marvin \ Sound

Hello. I am using SBEMU on a computer with a Biostar M6VCF motherboard. During startup, SBEMU displays that it uses the VIA VT82XX AC97 audio chip. The problem is that digital audio is always played twice as fast as it should be. Are there any SBEMU settings that will solve this problem? well then, …

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