Re: Help with identifying a burnt resistor on Socket 7 motherboard
Posted on 2021-09-01, 17:14
It is probably a resistor fuse, makes sense given it's placement.
Re: Help with identifying a burnt resistor on Socket 7 motherboard
Posted on 2021-09-01, 11:52
Wow, thanks. I know about this page but hadn't any clue this kind of information could be there. It's exactly the value I was thinking of but was not sure. You helped a lot! Thank you again!
Help with identifying a burnt resistor on Socket 7 motherboard
Posted on 2021-09-01, 10:12
Hi. I've been modifying my GA-586HX 1.55 motherboard (adding USB functionality) and made a short in the process. There is a resistor above the keyboard connector which has been damaged and to replace, I need to know it's value. Unfortunately it's no longer possible to read color designation of the …
Is this 386 DX CPU legit?
Posted on 2021-08-20, 06:19
Found a listing on eBay for this CPU, the price is nice. However I have noticed there is no stepping code marking on the ceramic spreader. Seems suspicious. Have you encountered such CPU and was it working? s-l1600.jpg EDIT: The datecode says year x7. There was no DX33 in 1987 to my knowledge, could …
Re: ESS sound card with 2MB wavetable chip - work in progress
Posted on 2021-08-08, 12:14
I have opened up a Nixdorf Siemens laptop which has ESS wavetable built in but it was only ES981P. It seems 2MB chips are only present in Compaq products.
Re: ESS sound card with 2MB wavetable chip - work in progress
Posted on 2021-08-07, 20:20
I'm currently waiting for three ES982A chips, will be intersting to compare their dumps. Hopefully it will arrive this month, it's been a long time already. Answers: 1. Yeah, those BTC cards without wavetable parts are relatively common, definitely more common than those with it. I currently two or …
Re: ESS sound card with 2MB wavetable chip - work in progress
Posted on 2021-07-01, 18:29
Ok, here's my plan: 1. Solder ES982A onto known working card which previously had ES981P. If it works, then there is something wrong with the flash ROMs. If it doesn't, then: 2. Find second ES982 chip and dump it. Necessary for comparison that the first dump I made is correct. 3. If the second dump …
Re: ESS sound card with 2MB wavetable chip - work in progress
Posted on 2021-07-01, 10:03
As the dump seems to be ok, I'm hesitating if I'll solder the ES982A chip on the working card. I have properly working MX29F1610 on there already and I think the result will be the same. Maybe I'll do it, to be 100% sure. Tried to solder CE pin of the MX29F1610 directly to ground but it didn't help. …
Re: ESS sound card with 2MB wavetable chip - work in progress
Posted on 2021-06-30, 18:21
Status update: Tried to swap crystal from known working card with ES981P, the card worked. So the crystals are not a problem. Then tried to solder MX29F1610 onto it, swapping it with the ES981P chip and all I got is silence when playing MIDI. Tomorrow I'll try to make some new dumps of the ES982 ROM …
Re: ESS sound card with 2MB wavetable chip - work in progress
Posted on 2021-06-30, 13:17
All of my cards have A19 pin properly connected so there shouldn't be an issue. One of them even says "ES981/ES982" on the silkscreen. I guess there is a problem either with the ES690F chip (which gets damaged while soldering, even though that seems weird to me as I'm applying heat only for couple …
Re: ESS sound card with 2MB wavetable chip - work in progress
Posted on 2021-06-30, 12:30
I have opened the ROM dump in Audacity as Signed 16bit PCM data. There is noise in the beginning and at the end but otherwise, most of the file sounds legit. There are weird squeaks here and there as some samples are too short and are effectively merged together because of the fast play. But so far, …
Re: ESS sound card with 2MB wavetable chip - work in progress
Posted on 2021-06-30, 11:50
Hopefully I'll be able to finish the project, after that I plan to share my work with others so everyone can modify such a card. Currently I own three different types and I would like to successfully modify all of them, with documentation.
Re: ESS sound card with 2MB wavetable chip - work in progress
Posted on 2021-06-30, 07:04
Checked the card and it seems the CE pin of the ROM chip is connected to A20 pin of the ES690F. Perhaps a mistake in datasheet as there is no need for such a pin? Checked another card which has a place for both ES689 and ES690 and the ES690's A20 pin is connected to ES689's CEB pin. Tried to swap …
Re: ESS sound card with 2MB wavetable chip - work in progress
Posted on 2021-06-29, 20:29
Great, I'm looking forward to your findings. BTW, here's a picture of another ES689F card with 33.8688Mhz crystal.
Re: ESS sound card with 2MB wavetable chip - work in progress
Posted on 2021-06-29, 20:15
There is an ES689F based card with ES981P wavetable ROM which uses 33.8688MHz crystal. I don't own such a card but I have found a picture of it. So I assumed it would work fine. Of course it doesn't mean the same applies to ES690F but I do have ES689F based card with 33.000MHz crystal. So I think …
ESS sound card with 2MB wavetable chip - work in progress
Posted on 2021-06-29, 19:24
Hi. I would like to share with you the project I've been working on for some time now. Since I have discovered there is a ES982 wavetable chip which was used mainly in old Compaq laptops I wanted to dump it a try to use it with some of the many ESS sound cards which have room for wavetable chip. I …
Re: Help identifying a cap on QDI Titanium IB+ motherboard
Posted on 2021-06-11, 17:25
Well, I have Titanium IB too (without the '+') and there is a 1000uF 6.3V capacitor in the same spot. However I have checked some pictures of other IB+ boards online and there is a capacitor which looks too small to be 1000uF cap. For example here. That's why I have assumed it's a 100uF one.
Help identifying a cap on QDI Titanium IB+ motherboard
Posted on 2021-06-11, 15:27
Hi. The board I own behaves strangely, at first it boots fine but after power cycle, it freezes at POST with some graphical glitches. The board had one capacitor broken off (CT12) so I have put a new one there, guessing it is a 100uF 16V as the other one near it. I'm thinking about complete recap …
Re: WP32 McCake : MT32 compatible waveblaster board
Posted on 2021-05-15, 09:50
Funny how just today I have told myself I should check the status of the project. And here's the update. I'm looking forwards for some hands on experiences from others.
Re: What's the difference between HardMPU and PCMIDI?
Posted on 2021-03-15, 12:20
Yeah I was wondering about that too. I would probably be able to dig through the forum and figure it out but haven't the time yet. My first guess is that HardMPU runds the SoftMPU app on separate hardware to lessen CPU usage but I could be wrong. It's still emulating intelligent mode. PCMIDI is real …
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