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

by

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

by

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

by

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

by

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

by

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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Re: Crystal Audio Chips.. any fans?

Posted on 2021-04-12, 20:09

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by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

Also, is there solid proof that this chip's OPL3 is worse than CS4236 anywhere? I hear this parrotted over and over but to me it sounds pretty identical to CS4236? I think Crystal just integrated this into the CS4235, fucked it up then fixed it in CS4236.. Surely there's a way of running through …

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Re: Crystal Audio Chips.. any fans?

Posted on 2021-04-10, 19:43

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by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

4231 has no internal FM at all - maybe the info assumes an external FM chip (so as to have a cs4231+fm "full" WSS compatible card) AFAIK internal FM started with the broken implementation in the CS4235 chip, it was fixed in CS4236 and carried over to CS4237 and CS4238 - beyond these I have no …

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Re: Bought these (retro) hardware today

Posted on 2021-04-10, 19:22

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

bjwil1991 wrote on 2021-04-09, 04:42: Not-so-retro: ASUS A8V-UAYVZ Socket 939 with a CPU of some kind and 4 sticks of RAM (no I/O shield, but it might be easy to find one): ASUS-A8V-UAYVZ.jpg Basis for a Win98 SE ultimate performance monster?

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Re: Replace Low ESR Electrolytic KZJ Cap with a polymer or similar NOS electrolytic ?

Posted on 2021-03-31, 14:48

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If the capacitors are used in a VRM or step down regulator it´s best practice to raplace them by some similar electrolytic capacitor model of the same type, a very low ESR Aluminium electrolytic with a high temperature range and a similar ripple current at high frequencies. I would use this …

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Re: My Dual Pentium 3 Slot 1

Posted on 2021-03-21, 19:50

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by gdjacobs

in Marvin \ System Specs

in Marvin \ System Specs

Only thing I love more then a slot 1 machine is a dual slot 1 machine :) What OS? and that stick of ram is looking lonely by itself I installed winXP, now I use 4x128Mb for ram and It's working well. Nice! Have you tried NT4? I've got a dual P3 Epox KP6-BS rig. With 1gb of RAM, the level of …

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Re: I recently found this hardware, AKA the Dumpster find thread.

Posted on 2021-03-21, 19:26

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

...because Windows 10 killed itself by wiping the C:/-drive during an upgrade. Perhaps it is becoming self-aware? Back in the day you needed a stupid user or a virus to cause such an event... :D You've got to be kidding me... Didn't something similar happen with 1809? This is why I got sick of it. …

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Re: Bought these (retro) hardware today

Posted on 2021-03-16, 17:37

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just a friendly reminder that posting ebay links is still frowned upon and I might clean the thread soonish So. Basically, just because it is on eBay, then it is a no-go? As an example. If I posted link to a newly produced Furia020 sold by sordan on eBay, then it would not be alowed. However if I …

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Re: Why are 3Com NICs regarded in such high regard?

Posted on 2021-03-05, 02:46

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

feipoa wrote on 2021-02-14, 16:55: Are you able to test it in Linux using iperf? Seems that when I test stuff in Linux it approaches the transfer spec, e.g. my gigabit ethernet benches around 950 mbit. Did 3Com ever make a gigabit product? They used Marvel/Sysconnect chips for some.

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