Re: I have a new 386 and 2 486 +Pictures :) I did some 3dfx tests too. and I have a few questions too.. Ontrack disc man

Posted on 17 minutes ago

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by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Nice D-series! I love that TV, have 2 of them myself both 32" and RGB modded. Like a massive arcade monitor!

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Re: An AdLib-Compatible Card (1986) Older than AdLib (1987)

Posted on 2020-10-22, 01:29

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by maxtherabbit

in Marvin \ Sound

in Marvin \ Sound

I'd use it

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Re: VGA Capture Thread

Posted on 2020-10-21, 16:16

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by maxtherabbit

in Marvin \ Video

in Marvin \ Video

Using the RCA input of the OSSC for 162MHz pixel clock is a bad move. The VGA input goes directly to the TVP7002 which can digitize up to 165MHz. However the other two inputs are buffered by a THS series buffer first which only has enough bandwidth for ~150MHz pixel clocks. I seriously doubt the …

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Re: VGA Capture Thread

Posted on 2020-10-21, 12:41

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by maxtherabbit

in Marvin \ Video

in Marvin \ Video

darry wrote on 2020-10-21, 07:01: the Voodoo 3 itself is at fault and using a shorter cable just reduces the scope of the issue (signal reflection). This is my operating theory

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Re: UNISOUND - Universal ISA PnP Sound Card Driver for DOS v0.75e

Posted on 2020-10-20, 14:54

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by maxtherabbit

in Marvin \ Sound

in Marvin \ Sound

The MPU port on the vibra can be changed, look for a jumper labeled MSEL as previously mentioned

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Re: VGA Capture Thread

Posted on 2020-10-20, 02:30

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by maxtherabbit

in Marvin \ Video

in Marvin \ Video

I know 1600x1200 is higher bandwidth. Just stating the dot clock isn't *that* much higher. 148.5MHz vs 162MHz. Unfortunately I didn't save any of the captures from that PC it was just a test. I could do it again but it would be a while

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Re: VGA Capture Thread

Posted on 2020-10-20, 02:00

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by maxtherabbit

in Marvin \ Video

in Marvin \ Video

I've digitized 1920x1080 from a geforce fx5200 via VGA on both my OSSC and data path vision-av sdi and it looks perfect. Didn't try 1600x1200 but I don't think the dot clock is much higher

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Re: VGA Capture Thread

Posted on 2020-10-20, 01:14

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by maxtherabbit

in Marvin \ Video

in Marvin \ Video

You can't go wrong with the C2G cables (made by legrand) but I hope I'm not sending you on a wild goose chase. I'm afraid the DAC on your voodoo may be to blame

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Re: VGA Capture Thread

Posted on 2020-10-19, 17:34

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by maxtherabbit

in Marvin \ Video

in Marvin \ Video

https://www.ebay.com/itm/Cables-2-Go-VGA-Cabl … 12/122635458833 I can personally vouch for the C2G VGA cables

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Re: VGA Capture Thread

Posted on 2020-10-19, 14:25

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by maxtherabbit

in Marvin \ Video

in Marvin \ Video

Yes I'd be inclined to agree that it is a reflection issue. You said you tried different cables and nothing changed, but are you certain that the new cables were actually impedance controlled?

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Re: VGA Capture Thread

Posted on 2020-10-19, 13:25

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by maxtherabbit

in Marvin \ Video

in Marvin \ Video

Almost all LCDs with an analog input low pass filter the signal before digitizing it. The OSSC does not The OSSC does have a switchable 95 MHz LPF on its VGA input, but that obviously makes the picture blurry at 1600x1200 and does nothing for the ghosting anyway . I will try with another VGA card …

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Re: VGA Capture Thread

Posted on 2020-10-19, 00:53

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by maxtherabbit

in Marvin \ Video

in Marvin \ Video

Almost all LCDs with an analog input low pass filter the signal before digitizing it. The OSSC does not

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Re: In an SMP system how does DOS/98 choose the CPU to utilise?

Posted on 2020-10-18, 16:27

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by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I ran two asymmetrically clocked PIIs for a short time in WinXP on my Tyan Tiger 100 - one at 350 the other at 450. I did not observe any problems, but this configuration was only a temporary affair.

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Re: SCSI Adaptec AHA-2940UW vs AHA-2940U2W differences?

Posted on 2020-10-18, 15:29

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by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Your drives will work with both, and are likely fast enough to benefit significantly from the U2W. The drivers in windows are the same, so you can upgrade later. Ultra2, Ultra160 and Ultra320 are inherently LVD standards (low voltage differential, which is backwards compatible with traditional …

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Re: In an SMP system how does DOS/98 choose the CPU to utilise?

Posted on 2020-10-15, 14:12

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by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

it's controlled by the motherboard and cannot be altered

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Re: Info needed on 286 board

Posted on 2020-10-13, 16:12

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by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you do decide to remove the DIP memory you should hang on to it, or sell it. That stuff has become fairly scarce, especially 70ns. Just because the CPU installed is fast doesn't mean the board is actually rated for that speed, or is even running it that fast. Need to check the oscillator and see …

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Re: Hi! For my next build, i hesitate between a 386 sx or dx. Intel cpu only.

Posted on 2020-10-13, 15:57

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by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

pentiumspeed wrote on 2020-10-13, 15:34: Disable all the i/o and use multi-i/o serial and parallel card instead. Why is something wrong with it?

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Re: Iconic Sound Blaster CT numbers

Posted on 2020-10-12, 01:41

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by maxtherabbit

in Marvin \ Sound

in Marvin \ Sound

My most cherished one is my ct1330a. That seems to deserve a spot in the pantheon

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Re: Moderator "It's not okay to bump a thread that's been dead without any new replies for 12 years."

Posted on 2020-10-11, 16:35

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by maxtherabbit

in Milliways

in Milliways

IMO there are sometimes valid reasons to necro a thread. When the new post is 100% on topic, and especially when it resolves a long unanswered question, it can be a very helpful practice. Problem is, most of the time the new post is tangentially related at best.

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Re: Micro ATX 486 - what's the degree of interest?

Posted on 2020-10-11, 16:30

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by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Whether it's the SC520 or a CPU socket, both are BGA parts that require a reflow oven to solder. PGA 486 sockets are not BGA parts. They are through hole. A skilled hobbiest could easily assemble a traditionally designed 486 board. The most challenging thing would be the fine pitch QFPs used by the …

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