Re: How does DOS know number of floppy drives?

Posted on 2022-10-13, 01:16

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

On PC-compatible systems, the phantom drive "B:" is not provided by the BIOS, but by DOS. The intention of the phantom drive is that you can copy files from one floppy to a different floppy using "copy a:file.txt b:". DOS keeps record of whether the drive was accessed last using the letter "A:" or …

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Re: Adding a secondary floppy controller w/ BIOS

Posted on 2022-10-06, 20:14

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

In my experience, floppy card option ROMs tend to be speed sensitive and don't like being shadowed. How fast is the system and can you disable shadowing for the ROM? Sergey's floppy ROM in particular also has other issues, it is very slow for example

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Re: Adding a secondary floppy controller w/ BIOS

Posted on 2022-10-06, 20:01

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

well at least I made my driver only take up a little bit of memory 😁

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Re: Elonex PC-486 mystery box...

Posted on 2022-10-06, 14:35

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Did you review the schematics I posted? There is a 7406 that could also be faulty in the keyboard clock/data signal paths

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Re: Elonex PC-486 mystery box...

Posted on 2022-10-06, 14:06

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Not really made any progress on this Elonex as yet.. I still think there is a problem with Keyboard communication. What I have worked out so far is that the VIA PLCC package VT82C42V is the keyboard and mouse controller...and that PS2 keyboard pin 1 (DATA) is directly connected to PIN2 of the …

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Re: The Soundblaster DSP project

Posted on 2022-10-04, 03:50

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

adpcm? https://www.vogons.org/viewtopic.php?f=46&t=49625 That could very well fix it, but the point is a genuine SB16 *should* have no problem playing the game unmodified, and the mod breaks it (only on the CT2230, the modified CT1740 still plays duke2 perfectly - I suspect the issue is the CT1747 …

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Re: "Accelerating" Windows 95 with Creative's Advanced Signal Processor (CSP)

Posted on 2022-10-04, 03:38

by

by maxtherabbit

in Marvin \ Sound

in Marvin \ Sound

Success. Installing the revision 5 of the SB Win9x driver update package (SBW95UO.EXE on TheMAN's compilation CD) on my 98SE system was required to allow the CSP to function. Source here: Re: The Sound Blaster ASP chip, Q-Sound and Games.

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Re: The Soundblaster DSP project

Posted on 2022-10-04, 01:54

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok so it seems to work fine on the CT2230 as well. Havent tested the MPU-401 yet but all digital audio and OPL working fine Update on this - the downgraded CT2230 plays MIDI just fine and bug free. However, the mod broke digital sound on Duke Nukem 2. The CT2230 with DSP 4.05 freezes at the first …

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Re: "Accelerating" Windows 95 with Creative's Advanced Signal Processor (CSP)

Posted on 2022-10-03, 13:03

by

by maxtherabbit

in Marvin \ Sound

in Marvin \ Sound

thank you! It appears the CSP chip does not work in windows 98 using the default driver set. Going to try again using TheMAN's Qsound instructions to get it running

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Re: 3 (+3 more) retro battle stations

Posted on 2022-10-02, 22:30

by

by maxtherabbit

in Marvin \ System Specs

in Marvin \ System Specs

You picked a card with 8-bit RAMDAC which means maximum 256 colors on screen. Not ideal, but not the end of the world really. Look at the jumpers on the card - some of them control "wait states" of the video card. It is probably JP1. You can check this by running some of the simple DOS interactive …

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Re: Commander Keen problem!

Posted on 2022-10-02, 22:21

by

by maxtherabbit

in Marvin \ Software

in Marvin \ Software

Just tried the latest version on my Matron Millennium. It does correct the off-colors but does nothing to address the jerky scrolling. Is this expected behavior? There’s a patch to fix the scrolling on ATI cards (search the PCKF to find it, it’s made by King_Duke) but I don’t know if it works with …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2022-10-02, 22:20

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

feipoa wrote on 2022-10-02, 20:34: socket_stack_for_BL3.JPG absolute king shit

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Re: Socket-8 Gaming Build

Posted on 2022-10-02, 22:17

by

by maxtherabbit

in Marvin \ System Specs

in Marvin \ System Specs

PC-Engineer wrote on 2022-10-02, 22:00: (compare the numbers, not the lines) if you reread his post carefully, you will see he is doing exactly that

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Re: 3 (+3 more) retro battle stations

Posted on 2022-10-02, 17:46

by

by maxtherabbit

in Marvin \ System Specs

in Marvin \ System Specs

Desktop, ISA --- 8900CL (up to 1MB 2MB , SVGA, ISA/VLB. Slightly faster than earlier 8900 cards) <- EXCELLENT CARD --- 8900D (up to 1MB 2MB , 8900CL w/ bugs corrected) <- EXCELLENT CARD I can also attest to those being excellent. In my experience they were significantly faster than the previous …

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Re: "Accelerating" Windows 95 with Creative's Advanced Signal Processor (CSP)

Posted on 2022-10-02, 12:15

by

by maxtherabbit

in Marvin \ Sound

in Marvin \ Sound

could you be so kind as to post a sample WAV file encoded with IMA ADPCM? I can't find one on the net for the life of me

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Re: 3 (+3 more) retro battle stations

Posted on 2022-10-01, 13:37

by

by maxtherabbit

in Marvin \ System Specs

in Marvin \ System Specs

--- 8900CL (up to 2MB, SVGA, ISA/VLB. Slightly faster than earlier 8900 cards) <- EXCELLENT CARD --- 8900D (up to 2MB, 8900CL w/ bugs corrected) <- EXCELLENT CARD I can also attest to those being excellent. In my experience they were significantly faster than the previous 8900s when the FIFO and …

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Re: PowerLeap PL-370/T

Posted on 2022-10-01, 03:10

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

He already tried #2

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Re: Socket-8 Gaming Build

Posted on 2022-09-29, 14:17

by

by maxtherabbit

in Marvin \ System Specs

in Marvin \ System Specs

Irinikus wrote on 2022-09-29, 13:51: It does indeed! […] Show full quote It does indeed! It's a MediaBus card consisting of an ADAPTEC 2940UW SCSI Card and a CREATIVE Sound Card. you better OPL mod that sucker

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Re: The Soundblaster DSP project

Posted on 2022-09-27, 02:31

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Frankly hand soldering the PLCC chip directly to the board is easier IMO, if we were at a point where a truly bug free binary was available I wouldn't have bothered with the sockets

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Re: What ISA cards for an IBM 5150?

Posted on 2022-09-27, 01:31

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

VGA software isn't the point I don't think, it's being able to connect an analog RGB display instead of a TTL RGBI one

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