Re: Two Power Supplies, One Motherboard?

Posted on 2021-06-09, 01:49

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There are methods used to parallel two DC supplies. https://techweb.rohm.com/knowledge/dcdc/dcdc-ldo/dcdc-ldo01/9235 Which is to say it can be done but isn't necessarily as straight forward as you hope. And in more high end environments there are diode modules like this: https://www.phoenixcontact. …

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Re: Two Power Supplies, One Motherboard?

Posted on 2021-06-07, 01:45

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There are methods used to parallel two DC supplies. https://techweb.rohm.com/knowledge/dcdc/dcdc- … dcdc-ldo01/9235 Which is to say it can be done but isn't necessarily as straight forward as you hope.

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Re: Recommended PSU for loaded P3 Build

Posted on 2021-05-11, 19:40

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I wonder how good/bad current chinese caps are . Are we still in capacitor plague territory or has the bar been raised somewhat ? I mean, there are probably decent chinese caps on the market and would imagine that Delta (and likely other reputable manufacturers) have a selection/testing process …

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Re: Recommended PSU for loaded P3 Build

Posted on 2021-05-11, 00:26

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I found this among my random parts, with 5 more amps than the Antec that died. Maybe it will last until I can find some 40 amp PSUs: The Delta will be enough to run two of those builds. Coppermine chips are not very power hungry, and Delta has some of the best engineering and build quality in the …

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Re: Pentium 133 DOS gamer dream machine (1995/97 ).

Posted on 2021-04-30, 23:07

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by gdjacobs

in Marvin \ System Specs

in Marvin \ System Specs

True... The P55 scales perfect within what it can do. However K6-III+ gives wider performance spectrum. It is like the P55 and then some more, when running full speed. Basically both can do, if you wish to go pre-pentium and Pentium. However for high res Pentium era Dos gaming. Well... Then the K6- …

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Re: SB16 issues

Posted on 2021-04-30, 20:33

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by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

The analog section of the sound blaster 16 cards require +12V from the ISA bus. If the connector from the AT power supply to the mainboard makes bad contact on the +12V line, this might cause issues like you describe. Try re-seating the power supply connector. I think you mean - 12V because if it …

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Re: Pentium 133 DOS gamer dream machine (1995/97 ).

Posted on 2021-04-30, 20:27

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by gdjacobs

in Marvin \ System Specs

in Marvin \ System Specs

I have to say that “If you want a good DOS computer that can run at 386 and 486 speeds and maybe even 286 speeds” this is the CPU you want. Allows you to play old DOS games and modern DOS games in good performance. Also it’s NOT expensive to build. If I could only have just one DOS computer this …

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Re: Modern PSUs with enough +5v amps for PIII rigs?

Posted on 2021-04-25, 19:56

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hey guys, I searched around a little bit to see if we already had a thread of recommended modern power supplies for these old platforms but didn't come up with anything. I understand that pre-Pentium 4 era, load was mainly on the +5v rail vs the shift to almost entirely on the +12v rail that we …

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Re: Identifying bad caps on motherboards

Posted on 2021-04-25, 14:44

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Got the ESR tester. I tested all 10µF caps on the above motherboard in-circuit. It is a bit of tricky to test with short leads and aligator clips. I guess I need to get very shor quality probes for this. I got readings between 0.6-3.6 Ω. That seems to be still good value according to the table (the …

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Re: Athlon 4

Posted on 2021-04-24, 15:48

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think I found the perfect way to get a sub 1ghz Athlon, sure it's a palamino core but it's got an unlocked multiplier and my 900 goes down to 500mhz and tested it all the way to 1600mhz, best $9 bucks I ever spent, bonus is it's only 1.5v so it's not as power hungry as a desktop chip The Athlon 4 …

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Re: ES1688 MPU401/onboard waveTable activation problem

Posted on 2021-04-22, 06:16

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by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

Ok, good idea, thx, which WT holder's pin should i check? Pin 58 (es1688) signal: WO active MIDI - (Hight level) = constant 5 V With playing MIDI - (Hight level) + data going Excellent! And one more - please, dont forget - measurements done on the modifiedGOLD16 board with es1688 chip (not 688)!!!! …

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Re: ES1688 MPU401/onboard waveTable activation problem

Posted on 2021-04-22, 02:10

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by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

Before suspecting the hardware, take a detailed look at your ESSVOL.EXE parameters. Specifically, check whether the "A" parameter is set to higher than zero. The ES1688 has an Aux channel, but the ES688 does not. you mean - check the signal gp1 on the chip and WT header? Just to be clear, I'm …

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Re: ES1688 MPU401/onboard waveTable activation problem

Posted on 2021-04-21, 21:27

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by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

Can you further subdivide the problem and check for MIDI serial output on the wavetable header and on the ES688 MIDI out pin (GPO1)? http://ohlandl.ipv7.net/sound/ESS688_Datasheet.pdf

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Re: Identifying bad caps on motherboards

Posted on 2021-04-21, 20:34

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The device advertises in-circuit capacitance/ECR testing (given by using 100 kHz pulses and low voltage). Will see how it goes! In worst case I can always use it to test desoldered parts. This is doubtful, at least in a general sense. Most of these apply a very low current across a discharged …

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Re: Identifying bad caps on motherboards

Posted on 2021-04-20, 20:27

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Or you just throw them away if they are in really bad shape or buy tested boards. It's not life insurance either but it's better than untested. I have a feeling that OP wasn't talking about these boards but maybe older boards with 20-30 years old elcos on them. The caps on a S3 or S7 board are much …

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Re: Identifying bad caps on motherboards

Posted on 2021-04-20, 18:49

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It's not impossible because there are tons of boards available from that era and most of them work fine. Those boards are always cheap ($5-20) so it's pointless to invest too much time & money in fully recapping one. P4 OEM boards are inexpensive. S754, S939, and server boards are worth a little …

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Re: Identifying bad caps on motherboards

Posted on 2021-04-20, 14:03

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It's often cheaper and easier to just get a flawless board. If the board is rare then you are better off replacing all elcos. Some entire classes of board are prone to failure. KZG caps like you've shown will, inevitably, fail, as will Nichicon ultra low ESR lytics, even if they're not part of the …

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Re: FTP Client for Win95C

Posted on 2021-04-17, 21:19

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by gdjacobs

in Marvin \ Software

in Marvin \ Software

WS_FTP LE for a GUI client. NCFTP for a CLI client. http://omolini.steptail.com/mirror/win95/win9 … -1/ftp/ftp.html

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Re: Why DOS died...

Posted on 2021-04-17, 19:53

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by gdjacobs

in Milliways

in Milliways

badmojo wrote on 2021-04-17, 12:19: I've run the numbers - it was ~4AM Saturday morning in Estonia when this thread was created. Prime drunk posting time 😂 Does Estonia have rot gut vodka dispensed in plastic bags?

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Re: Crystal Audio Chips.. any fans?

Posted on 2021-04-13, 13:54

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by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

Yeah, but no one seems to have done it despite the claims that one is inferior (which is not my experience..) I only have a CS4289 paired with a CS4232 (the famous Zoltrix card), and I find the FM output harsh and objectionable. Not as bad as CQM, mind you. I never noticed any of the FM clicking …

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