Re: VLB Clock & Wait State - Safe to experiment?

Posted on 2023-12-08, 16:51

by

by Erwin_Br

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks guys, that clarifies a lot already. I'm still not clear on the configuration of my motherboard, though. Looking at the documentation, I can set the VL-Bus Clock and Wait State only in 2 combinations: 0 WS, <= 33MHz --or-- 1 WS, > 33MHz By setting 2 jumpers for WS and VLB Clock to either 1&2 …

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VLB Clock & Wait State - Safe to experiment?

Posted on 2023-12-08, 10:39

by

by Erwin_Br

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm setting up a new machine with an ASUS VL/I 486SV2G motherboard, and so far everything is running smooth. I slotted 2 VLB cards, a S3 86c805-p graphics card, and a Winbond W83787F multi I/O card. Now, I don't know much about the VLB clock and wait states, but the board is currently configured for …

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Re: How to disable IDE interface on CT2290?

Posted on 2023-12-02, 20:57

by

by Erwin_Br

in Marvin \ Sound

in Marvin \ Sound

Got it, thank you very much!

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Re: How to disable IDE interface on CT2290?

Posted on 2023-12-02, 16:44

by

by Erwin_Br

in Marvin \ Sound

in Marvin \ Sound

Okay, so if I set the IRQ to 15 on the SB16 card, which is the same IRQ my Multi-I/O card is using, and then set the channel to Tertiary or Quarternary it won’t conflict with the I/O card?

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How to disable IDE interface on CT2290?

Posted on 2023-12-02, 16:10

by

by Erwin_Br

in Marvin \ Sound

in Marvin \ Sound

I have a SB16 CT2290 and I need to disable the IDE interface because I want to free up the IRQ. On Stason I found that I can set the IRQ with jumpers JP1 to JP5, but there’s no option (it seems) to completely disable the IDE controller. Any ideas how I can disable it?

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Tantalum cap: Bust or black paint?

Posted on 2023-11-01, 23:01

by

by Erwin_Br

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I need your experience. I just got this 1991 card and on visual inspection I found this: Filename IMG_2310.jpeg File size 966.04 KiB Views 237 views Is it damaged or just innocent black paint? And in case of doubt: How can I find out without fireworks? The board itself, overall, looks very clean, …

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S3 86C805-P memory upgrade?

Posted on 2023-10-30, 11:27

by

by Erwin_Br

in Marvin \ Video

in Marvin \ Video

I have a S3 86C805-P lying around that I would like to use for a new DOS build. Its 8 memory DIP slots are all empty and I was considering to look for an upgrade. The card supports up to 2MB, with 70ns DRAM. My questions are: 1. Are there specific requirements I should be looking for? Right now I'm …

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Re: L2 cache: how to determine spec?

Posted on 2023-10-28, 17:04

by

by Erwin_Br

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

SScorpio wrote on 2023-10-28, 15:00: The chip size is normally in the name: um61 256 ak-15. So 256 Kbits / 8 = 32KB. The 15 at the end is the speed. When doing a sanity check, um61512ak-15 was a suggested search string, those would be 512, so 64KB modules. Super clear, thanks a lot!

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L2 cache: how to determine spec?

Posted on 2023-10-28, 14:42

by

by Erwin_Br

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, I’m checking the jumper settings of my “new” asus vl/i-486sv2g mobo and I’m seeing a weird combo of jumpers that shouldn’t be possible to configure the L2 cache settings. (i.e. the combination is not mentioned in the manual) So I need to correct it, but I’m not sure about the capacity of the …

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Re: Orpheus II soundcard thread *** LT board now available ***

Posted on 2023-10-26, 17:41

by

by Erwin_Br

in Marvin \ Sound

in Marvin \ Sound

there is no confirmation email, once the form is submitted the entry gets added to the queue currently no OrpheusII variant is in stock - but LT boards are made at the factory as I write this It’s the PCMidi card for which I applied. But good to know it’s just a matter of patience, thank you! I’ll …

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Re: Orpheus II soundcard thread *** LT board now available ***

Posted on 2023-10-26, 14:03

by

by Erwin_Br

in Marvin \ Sound

in Marvin \ Sound

Hi guys, sorry for going slightly off-topic, but do you know if it's normal you don't get a confirmation mail after submitting the purchase form? I'm afraid my request (I sent it 2 weeks ago) might not have come through. How long does it usually take for a reply?

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Re: Doom slows down after a while

Posted on 2021-07-20, 14:58

by

by Erwin_Br

in Marvin \ Software

in Marvin \ Software

Well, in the meantime I did indeed isolate the problem to SoundCanvas playback. When I set up the game to play music through SoundBlaster mode, there is no issue.

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Doom slows down after a while

Posted on 2021-07-19, 09:26

by

by Erwin_Br

in Marvin \ Software

in Marvin \ Software

Hello, I'm running Doom on a 486 DX2, with 16 Megs of ram. After a while, the music stops playing and the game starts to slows down to eventually unplayable speed. By that time I exit the game. I remember it could have something to do with MIDI playback through the Roland SC-55, but I can't find …

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Sound Blaster 16 PnP (Vibra) - Setting IRQ to 7?

Posted on 2021-05-16, 15:17

by

by Erwin_Br

in Marvin \ Sound

in Marvin \ Sound

Hey guys, Is it possible to change the IRQ to 7 on a SB16 Vibra? The reason I ask is that I'm having trouble doing so with the CTCU utility. The option is simply not there, it only displays 5 as an option. I also tried to manually edit CTPNP.CFG but it gets overwritten back to 5 after a reboot. …

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Re: Have you opened your SC-55 to check the battery inside?

Posted on 2021-05-16, 15:11

by

by Erwin_Br

in Marvin \ Sound

in Marvin \ Sound

Ok guys, I'm going to open my SC55 as soon as I'm home. 2 questions: 1. Wouldn't the SC55 give a warning when the battery is low or gone? Thought I read something like that. 2. Will the SC55 operate fine without a battery? If so, I will leave it out altogether. Thanks!

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Re: Attaching serial cable to old motherboard

Posted on 2021-04-28, 19:33

by

by Erwin_Br

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

maxtherabbit wrote on 2021-04-27, 23:15: AT/Everex is vastly more common. I do not believe you pose any risk to the board if it is wrong. Just hook it up and it will 90% just work Thanks! I will give it a shot.

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Re: Attaching serial cable to old motherboard

Posted on 2021-04-27, 20:21

by

by Erwin_Br

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

PARKE wrote on 2021-04-27, 17:36: This is a 'guide' that shows the difference between the 2 main implementations. DTK3a.jpg Thanks! So my cable is clearly the new AT/Everex type, but I don’t know yet my motherboard. I guess I will have to check with the multi meter what is the ground pin.

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Re: Attaching serial cable to old motherboard

Posted on 2021-04-27, 15:27

by

by Erwin_Br

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Using a multi-meter on the cable itself I was able to measure the layout without having to remove the plastic. The result: "10 pin IDC" --> "9 pin d-sub connector" 1 --> 1 2 --> 3 3 --> 5 4 --> 7 5 --> 9 Etc... So the layout appears to be: 13579 2468 But again, how do I know if that matches my …

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Re: Attaching serial cable to old motherboard

Posted on 2021-04-27, 14:54

by

by Erwin_Br

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My motherboard guide says: 1 - Data carrier detect 2 - Receive data 3 - Transmit data 4 - Data transmit ready 5 - Signal Ground 6 - Ready to receive data 7 - Request to send data 8 - Clear to send 9 - Ring indicator So the ground pin is number 5 on the motherboard. If I understand correctly, the …

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Attaching serial cable to old motherboard

Posted on 2021-04-27, 12:26

by

by Erwin_Br

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have bought a “modern” serial cable, with 2 10 pin IDC connectors and 2 DB9 ports. The idea is to connect it to my recently acquired 486 motherboard, a 486-GIO-VT. Now I just learned that there is no definitive standard for these things and that the pin layout on the motherboard headers might not …

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