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ATi Radeon 9500 - Missing Power-Driver or Power-Mosfet

Posted on 2019-08-17, 13:55

in Marvin \ Video

in Marvin \ Video

Greetings, please look at the Pictures here. I have the Radeon 9500 AGP Graphics Card with a missing Power-Mosfet-Driver or Power-Mosfet. photo_2019-08-17_15-49-17.jpg photo_2019-08-17_15-49-22.jpg I need help for the correct missing Driver or Mosfet SMD for replacement: photo_2019-08-17_15-49-10. …

Re: Missing Bios on 8 Bit HD Floppy Controller

Posted on 2019-04-08, 23:31

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi @dkarguth, i saw this Controller as "MT883" with a 64kbit BIOS installed because it's a 1.44 MByte Version and XT's often lacks support at HD Disks. It will be cool to have that original Dump of that bios - otherwise it can run with Sergey's Floppybios. Lets see...

Missing Bios on 8 Bit HD Floppy Controller

Posted on 2019-04-03, 19:32

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello there, i had this 8 Bit HD Floppy Controller a long time, works nice - also with Sergey's Floppy Bios - But... I need that original Bios Dump from the Card, it is known as MT883 Type and has an UM8398 UMC Floppy Controller and an 2764 BIOS Socket. photo_2019-04-03_21-26-26.jpg photo_2019-04-03 …

Re: Tube Time: Announcing The Snark Barker, a 100% Compatible SB 1.0 Replica!

Posted on 2019-03-31, 19:19

in Marvin \ Sound

in Marvin \ Sound

Wow, i wasn't visiting Vogons for this Year - Shame on me - and an Friend told me for that Snark Barker here, .. What an AWESOME Project, ... Damn :D I had a lot of empty and unsoldered "other" Projects like the Micro8088 from Sergey and now that Sound Card Clone, ... My Stainless Steel Iron with …

NEC Multisync II JC-1402HMED Flyback Transformer

Posted on 2018-07-06, 00:06

in Marvin \ Video

in Marvin \ Video

Hello there, i sucessfully renewed an old NEC Multisync II JC-1402 TTL/Analog RGB Monitor (Electrolytic Caps and so on) but my Flyback Transformer (LOPT) is on his last Breathings. So i have a fuzzy Picture in Warm State at about 20-30 Minutes. The Service Manual says that this Fault is the Flyback …

Re: Yamaha DB50XG - Dead - No Sound

Posted on 2017-10-22, 14:52

in Marvin \ Sound

in Marvin \ Sound

I've ordered now the NEC 18 Bit DAC and the two OpAmps and that 74HC. I pull that Sh*t out and replace them. Just for fun :D That Card has two ROM Banks of PCM Data. Is that Flash ROM or masked rom? When someone has two dumps of it.. Then i can burn new one. But so i need the correct Flash :D You …

Re: Yamaha DB50XG - Dead - No Sound

Posted on 2017-10-22, 13:42

in Marvin \ Sound

in Marvin \ Sound

So, Another News: That Chip who become hot is the AWM2 Synth Chip and its normal that this IC become hot. Suggestion here to put an Heatsink to it, ... Hmm so there must then an another Problem then. Failing DAC or OPAMP or so? Hmm lets check some ICs to find an Replacement, or better: Anyone can …

Re: Yamaha DB50XG - Dead - No Sound

Posted on 2017-10-21, 20:29

in Marvin \ Sound

in Marvin \ Sound

Hi Keropi, Yeah. You're right, ... Unless i find a replacement IC and solder it in, ... I think it's better to bin that Module in to Electronic Trash, ... Greetings

Re: Yamaha DB50XG - Dead - No Sound

Posted on 2017-10-21, 16:37

in Marvin \ Sound

in Marvin \ Sound

So, Bad News: The DB50XG Plays no Sound on my SB16 and that Sound Processor IC becomes Hot... My Aztech Wave Power with Ensoniq Otto runs fine but that Card has no All Notes Off Program so under Pure DOS useless. So its your Turn here :) Is that a common Fault on the Yamaha? When that IC is gone has …

Re: Yamaha DB50XG - Dead - No Sound

Posted on 2017-10-21, 16:03

in Marvin \ Sound

in Marvin \ Sound

So, Connector and all ICs now with Flux reflowed. Test under MEGAMID.EXE shows no Sound at all. The ICs become warm, the H8 CPU and the other ICs are warm too, like the ROMs and the RAMs, but ... The XQ036A0 become Hot. The Fingermeter shows at 4-5 Second: It Hurt... Must test the Card with a GM …

Yamaha DB50XG - Dead - No Sound

Posted on 2017-10-21, 12:16

in Marvin \ Sound

in Marvin \ Sound

Hello there, I have that nice Yamaga DB50XG Midi Module. Its complete Dead ... I become that for free and the Owner says, it plays then the Sound was there then nothing then there, then dead ... Looks for me for a Wiggle Contact Problem on the Board. So i checked first all Tantals on the Board. …

Re: IBM PS/2 floppy disk drive restore / repair

Posted on 2016-08-25, 20:39

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@386_junkie: Yay! My IBM Model 40SX (2.88 MB Sony) and IBM Modell 30 8088 with 1.44 MB Mitsubishi need new Electrolytic Caps and my 40SX Mainboard also 😀 Greetings

Re: Short on ISA slots? Try this.

Posted on 2015-12-01, 23:23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi h-a-l-9000 and PCBONEZ, thank you both for the technical details about the "Off Topic" Euro PC. The Problem is, the Euro PC II need a DC Power Supply of 18-19 Volts at 2,5 Amps. So i think i need a DC Step Up Voltage Converter to transform 12 Volts from a AT Power Supply to powering the ISA …

Re: Short on ISA slots? Try this.

Posted on 2015-12-01, 20:11

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi PCBONEZ, thank your for you statement and for the attechment to turn a blanked statement to a rock solid 😁

Re: Short on ISA slots? Try this.

Posted on 2015-12-01, 18:09

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi h-a-l-9000, you're are right on there, that no external AT Power Supply is needed for a Host Machine that provides plenty of Amps. But for a special Thing, the Schneider Euro PC who has a little tiny Power Supply (Or some other little Computer with a 8 Bit Slot or a compact Computer), they need …

Re: Short on ISA slots? Try this.

Posted on 2015-12-01, 09:49

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Agree with dr.zeissler :happy: @jwt27: I had a "nice" to have feature for your awesome ISA-Brackets with the -5V Regulator Supply: I'd would be "cool" to have a some sort of 4 jumpers to disable or enable all ISA Power Rails like +5V -5V +12v -12v in Case to use for an external AT Power Supply on a …

Re: Short on ISA slots? Try this.

Posted on 2015-11-30, 12:26

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi PCBONEZ, thank you 😀 That was strange with SCSI 😀 Greetings

Re: Short on ISA slots? Try this.

Posted on 2015-11-29, 23:49

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah! Thats the Information that i want :-) Thanks. And sorry for my English or Grammatics, i'm not a English man :D It's best to use one PSU for both - is right, also to provide some more Power i can add a Aux AT Power to the ISA Backplane and cut all the 4 Power Lines (+5V/+12V/-5V/-12V) out from …

Re: Short on ISA slots? Try this.

Posted on 2015-11-29, 21:16

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi PCBONEZ, yes, two Power Supplies in Paralell (because the Host PC provides Power and your have connected a AT Power Supply to the passive ISA Backplane) This Situation is given: The Mainboard with CPU, PCI and ISA Bus has it's own Power Supply in Form in a ATX Power Supply or an older Computer …

Re: Short on ISA slots? Try this.

Posted on 2015-11-29, 20:52

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi PCBONEZ, that's right, that the traces on the ISA Motherboard (Master) have current limits and when i overpower the ISA Bus from the Motherboard it will burn the Rail on the ISA BUS from the Motherboard. But: When i use the Power from the ISA Motherboard (Master) and use the Power from the …

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