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Re: Fixing CT-6BTM0 motherboard - C0, C1 and then ambulance alarm

Posted on 2024-06-05, 17:39

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Currently testing stability on this machine with Pentium III 866MHz @ 100x6.5 (650MHz) on slotket with looping 3DMark2001 together with Radeon 9250 with 128bit memory bus. So far so good. (I have a 512MB PC133 CL2 RAM stick installed. It's dual-ranked, so the board only addresses 256MB, but that's …

Re: Fixing CT-6BTM0 motherboard - C0, C1 and then ambulance alarm

Posted on 2024-06-03, 18:01

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Congrats. So, I was right by guessing memory issues. Do you have any explanation about the "concert" part of the sound error codes? Did you changed PSU or some other hardware components in your last successful test? I think i do, but it doesn't help. On some random events, i got it into this "alarm …

Re: Fixing CT-6BTM0 motherboard - C0, C1 and then ambulance alarm

Posted on 2024-06-01, 20:14

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

IT WORKS! I do not know, why it started to behave differently today, when i started to "play" with it once again. Immediately, today, i heard that the ambulance alarm is gone. I only got single long beeps. So i continued playing because it was at least some progress after about half a year i've …

Re: Fixing CT-6BTM0 motherboard - C0, C1 and then ambulance alarm

Posted on 2024-05-31, 18:22

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, the only thing that comes to mind when I hear that siren is the CPU temp sensor tripping. I looked at some photos on the net and I see this mobo does indeed have such sensor. Is it working properly on yours? I would assume it's just a thermistor, so you can check the resistance and even if it …

Re: Compaq Business Wavetable Sound Card - ES1869F + ES692S

Posted on 2024-05-25, 19:51

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

In dos games, when i choose Sound Blaster / Ad Lib, i should be getting ESFM sound, correct? But when i choose General Midi with 330 address, i should be getting the sound out of that ES692S chip, correct? I know that General Midi can be chosen without any wavetable additions. So is there a …

Re: Fixing CT-6BTM0 motherboard - C0, C1 and then ambulance alarm

Posted on 2024-05-25, 19:50

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It's odd to see Cx code so soon in the boot process - I assume it's AWARD BIOS? I haven't done much with these lately so my memory of it might be hazy. Did you try to reset the mobo via reset switch after it has been powered? Could be another case of bad power good signal. Yes, reset does not help. …

Compaq Business Wavetable Sound Card - ES1869F + ES692S

Posted on 2024-05-25, 14:17

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I recently got this card and it seems to be absolutely amazing card. It's basically the very compatible (and even enhanced kind of) ESS sound card that has built-in E-Wave waveblaster. But as i have very little experience with any "external synthesizer" concept, i have few questions. In dos games, …

Fixing CT-6BTM0 motherboard - C0, C1 and then ambulance alarm

Posted on 2024-05-25, 14:06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi all, I hope someone of you could suggest me what to look for. The board is doing one long beep and then does ambulance alarm noise indefinitely. (and it seems to be getting regularly "corrupt") I'm using known-good Celeron 300A, known good 128MB SDRAM and known good ATI 3D RAGE PRO AGP graphics …

MP787V ISA Multi I/O card - add rom socket?

Posted on 2024-05-25, 14:01

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I was able to buy this card and amazingly it seems to be completely new. But the reason i bought it was that it seems to be possible to have ROM socket on it. So i thought i would like to ask you guys about it. There are few more pads to be filled possibly, so maybe anyone of you could let me know, …

Re: What retro activity did you get up to today?

Posted on 2024-04-21, 15:26

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Was looking a bit into my cellar, photographed two machines' internals. Both are s754 machines. The blue machine had a sticker on the case. I checked the GPU and it has been upgraded to 9600 Pro. No idea what cpu the green motherboard may have. At some point might start a revival project base on one …

Re: Bought these (retro) hardware today

Posted on 2024-04-04, 18:21

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I am crossing my fingers for you, but somewhere around then Acer went to weird not quite standard stuff. Huh, you're not wrong... looks like the slots for the plastic spacers are slightly non-standard. Thankfully, there are also threaded holes for metal standoffs, so looks like I might have dodged …

Re: Bought this (Modern) hardware today

Posted on 2024-03-14, 18:47

in Milliways

in Milliways

I'm now a fully grown proper MAN , not just some self-proclaimed tinkerer kid! I got myself my very first oscilloscope. Should be plenty enough for a first oscilloscope and retro machines. Open box, but new. ~150€ from a local auction. 4Ch, 110MHz, 1GSa/s Every self respecting man has an electronics …

MS-DOS with aligned partitions on CF card, is it possible?

Posted on 2024-02-25, 19:15

in Marvin \ Software

in Marvin \ Software

Hi all, I've searched around and tried different things, but i don't seem to get it working no matter what i try. My test real hardware is a 386DX with MR-BIOS to give the best chances of working. (No HDD size problems from motherboard's part for ex.) And i use a 4GB CF card, which should be perfect …

Re: What retro activity did you get up to today?

Posted on 2024-02-17, 18:12

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Changed the fan for this power supply and I'm very happy with it, except the noise which is around 40dB. So I put a buck DC/DC converter between the fan and the power socket. Now it work at 7V. IMG_20240213_201117.jpg It's an overkill that actually works worse. Fans (or any DC motor), just like …

Re: Fixing Toshiba T1200 - Flickering LCD panel with no picture

Posted on 2024-02-17, 13:06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

New batteries are in. Waiting for some capacitors to do a full capacitor replacement on PSU. ... and a 2S 18650 controller board to create a new Li-Ion based battery for this machine. 😉

Re: What retro activity did you get up to today?

Posted on 2024-02-17, 10:27

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Changed the fan for this power supply and I'm very happy with it, except the noise which is around 40dB. So I put a buck DC/DC converter between the fan and the power socket. Now it work at 7V. IMG_20240213_201117.jpg It's an overkill that actually works worse. Fans (or any DC motor), just like …

Re: What retro activity did you get up to today?

Posted on 2024-02-04, 18:48

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Played around with my ASUS PVI-486SP3. https://theretroweb.com/motherboards/s/asus-pvi-486sp3 My main 486 is based on QDI V4S471/G. https://theretroweb.com/motherboards/s/qdi-v4s471-g The ASUS board is newer and has PCI slots. I thought i could easily get better doom and quake benchmarks with the …

Re: How about a MR-BIOS ROM file repository?

Posted on 2024-02-04, 15:19

in Marvin \ Software

in Marvin \ Software

Was there ever an MR BIOS for SIS471? I've never heard of one. I'd be very interested in it, as I actually have a SIS471 board in my 1989-1991 UMC US5X-40 system :) It's mentioned in several docs, including Microid's website (https://web.archive.org/web/19961111131504fw_/http://mrbios.com/chipset. …

Re: What retro activity did you get up to today?

Posted on 2024-02-01, 17:15

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Got myself recently yet another motherboard. I deliberately went for one with leaking battery corrosion. Wanted to experience cleanup process. Also this one is from quality maker QDI and it supports 3v CPUs even with "undocumented" 3x and 4x multipliers. Cleanup went rather smoothly. White vinegar …

Re: How about a MR-BIOS ROM file repository?

Posted on 2024-01-30, 18:58

in Marvin \ Software

in Marvin \ Software

Was there ever an MR BIOS for SIS471? I've never heard of one. I'd be very interested in it, as I actually have a SIS471 board in my 1989-1991 UMC US5X-40 system :) It's mentioned in several docs, including Microid's website (https://web.archive.org/web/19961111131504fw_/http://mrbios.com/chipset. …

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