Re: Compaq Presario 433, my 486 pure DOS machine

Posted on 2020-05-22, 09:07

by

by 386SX

in Marvin \ System Specs

in Marvin \ System Specs

One thing I'd like to ask if someone studied where the 20MB limit is and if it'd be possible to go higher considering an Overdrive 100 would be possible I suppose, I certainly tried the 66Mhz years ago. But that limit looks like a marketing choice more than a hw limitation. Regarding the ram, I …

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Re: Compaq Presario 433, my 486 pure DOS machine

Posted on 2020-05-21, 14:39

by

by 386SX

in Marvin \ System Specs

in Marvin \ System Specs

Man you will not believe it, I think I may have found one in a local store the 425 model in decent a bit yellow condition... 😁 Let's hope if still available.

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Re: Compaq Presario 433, my 486 pure DOS machine

Posted on 2020-05-21, 14:21

by

by 386SX

in Marvin \ System Specs

in Marvin \ System Specs

Someone with a good high-end microphone should record the boot process sound from the switch sound, the floppy disk search, the ram count... 😁

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Re: Compaq Presario 433, my 486 pure DOS machine

Posted on 2020-05-21, 13:41

by

by 386SX

in Marvin \ System Specs

in Marvin \ System Specs

Hehe yeah :) I hear you on not wanting to open and close it too much too. It's the only computer I've owned that must be _fully_ re-assembled just to switch on. Break or cross-thread the two chassis screws and it's game over. Not to mention anything else going wrong when you slam it shut like a …

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Re: Compaq Presario 433, my 486 pure DOS machine

Posted on 2020-05-21, 13:18

by

by 386SX

in Marvin \ System Specs

in Marvin \ System Specs

425 owner here. Such neat little machines :) 425.jpg Mine's running the stock SX/25 CPU. I've maxed the RAM to 20MB and installed an SB16. And since the thread is bumped, I might as well answer a 3 year old question... Is there anyone that know where i could maybe find the copy of the recovery disk …

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Re: Compaq Presario 433, my 486 pure DOS machine

Posted on 2020-05-21, 12:53

by

by 386SX

in Marvin \ System Specs

in Marvin \ System Specs

What a great computer the Presario 433/425. A friend had it and we played the game Stunts on it million times when I had the 386SX20 and I couldn't run it full detail and smooth fps. Not for the cpu but probably for the OTi37C vga I think to remember, the difference from my 386SX and its 486SX was …

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Re: I wish I had discovered Windows ME sooner!

Posted on 2020-05-21, 12:32

by

by 386SX

in Marvin \ Software

in Marvin \ Software

Retrozilla web browser has been in development lately and would love someone to devote a thread on it in vogons forum. Here is a link to a discussion: https://msfn.org/board/topic/181416-retrozilla-community-edition/?tab=comments#comment-1180391 Basically it has the modern protocols bolted onto the …

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Re: Latest AGP cards with PCI-EX bridge question

Posted on 2020-05-21, 12:04

by

by 386SX

in Marvin \ Video

in Marvin \ Video

Your biggest issue with them and all cards from that time period is the terrible lead free solder they used I remember some discussion back then on the subject. I wanted to use one of this cause I'm building a P4 3,2ghz (unfortunately northwood, my mobo has the old type of P4 mainboards mosfet …

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Latest AGP cards with PCI-EX bridge question

Posted on 2020-05-21, 11:16

by

by 386SX

in Marvin \ Video

in Marvin \ Video

Hi, I have two Sapphire HD3x50 cards, those ones with the back bridge chip without heatsink on it, one is a HD3450 and a HD3650. They both run at quite high temperature considering the bridge chip itself is so hot I can burn my finger immediately. I never understood why these didn't have an heatsink …

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Re: I wish I had discovered Windows ME sooner!

Posted on 2020-05-21, 09:46

by

by 386SX

in Marvin \ Software

in Marvin \ Software

on the website i mentioned earlier the engineer left behind a windows me and a windows 98se cabinet file that replaces the original one on the windows version CDROM copy. That gives the installation the ability to install on systems of up to 32gb ram. Only up to 4gb is usable being a 32bit windows …

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Re: Asrock FM2A55M-DGS unknown broken component

Posted on 2020-05-21, 09:22

by

by 386SX

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

here is a link to a place where members share technical layouts of motherboards showing capacitor, MOSFET, diode values I mean, MOSFETS can look like transistors or power regulators. https://www.badcaps.net/ Thanks. I'll look for that mosfet having same or similar compatibility. Of all the …

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Re: [Experts] Asrock FM2A55M-DGS unknown broken component

Posted on 2020-05-20, 16:15

by

by 386SX

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So yes, left pin of the Q38 should be connected to left pin of the resistor mainboard3.jpg Great. I was testing as mentioned that these are in fact connected. Maybe at the end it will not boot anyway but again, thanks. I'll look for the same or an equivalent SOT23 p-mosfet I think there're …

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Re: [Experts] Asrock FM2A55M-DGS unknown broken component

Posted on 2020-05-20, 15:52

by

by 386SX

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Update: things are getting bad... I think under the p-mosfet there was serious glue that make it hard to remove and I may have lost the left low pad to solder...this smd should be desoldered with the hot air specific tool I don't have.. :( Where the left point may end up on the mainboard? From the …

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Re: I wish I had discovered Windows ME sooner!

Posted on 2020-05-20, 15:38

by

by 386SX

in Marvin \ Software

in Marvin \ Software

There was apparently a vendor Microsoft listened to that allowed 2G RAM maximum but not all machines could do it. I'd recommend using system.ini tweaks for it (without unofficial patching.) An engineer known as Rudolph Loew released many patches for win9x that were stable. He has passed away and …

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Re: [Experts] Asrock FM2A55M-DGS unknown broken component

Posted on 2020-05-20, 14:30

by

by 386SX

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Update: things are getting bad... I think under the p-mosfet there was serious glue that make it hard to remove and I may have lost the left low pad to solder...this smd should be desoldered with the hot air specific tool I don't have.. :( Where the left point may end up on the mainboard? [ERROR] …

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Re: [Experts] Asrock FM2A55M-DGS unknown broken component

Posted on 2020-05-20, 13:37

by

by 386SX

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Roman555 wrote on 2020-05-20, 04:35: Q37 is really a N-MOSFET 2N7002K. It can't work instead of Q38 because Q38 is a P-MOSFET. I knew that I wasn't lucky to try with that.. anyway I'll try desolder it again and find that one.

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Re: [Experts] Asrock FM2A55M-DGS unknown broken component

Posted on 2020-05-19, 20:07

by

by 386SX

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, According to a boardview for a similar model the Q38 is a P-mosfet AP2309GN manuf. APEC Datasheet The purpose of this mosfet is to send +5VSB when the mainboard is turned off. The Q41 is N-mosfet and it does the same for +5V when the mainboard is turned on. They both are controlled by +12V on …

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Re: [Experts] Asrock FM2A55M-DGS unknown broken component

Posted on 2020-05-19, 18:08

by

by 386SX

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks like a surface-mount transistor Yeah, I think that too. I've found on the board another Q37 component that looks the same, has a code but is so difficult to read, I'm trying to read it.. EDIT: Q37 near to the SATA ports has a "K72 N2" code on it! EDIT2: There're different version of similar …

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Asrock FM2A55M-DGS unknown broken component

Posted on 2020-05-19, 17:07

by

by 386SX

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, It's a long time I've this mainboard (FM2A55M-DGS rev 1.02) and never understood why it could not post; I tried cpu, rams, a new bios eeprom and at the end it became a personal quest to try understand the problem. At the end I think I found it: close to the ATX connector there's this component I …

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Re: 3Dmark03/05 can't start on Win ME

Posted on 2020-05-19, 07:57

by

by 386SX

in Marvin \ Software

in Marvin \ Software

I suppose the problem here is I don't use Kernelex and the latest version nowdays are higher (v360 for 3dmark03 I think). I tried and still same errors.

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