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Re: 286 16mb ram, cdrom driver issues

Posted on 46 minutes ago

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've also got a 286 board that also only recognises 4MB modules in two of the four sockets as well - it's a bit wacky, that one. I'd be interested to see how well that system performs - my experience of 25MHz boards is that they nearly always insert wait states; I don't think 70ns modules (which is …

Re: German theme 486 computer.

Posted on Today, 08:38

in Marvin \ System Specs

in Marvin \ System Specs

“Don’t step on my blue Swede shoes” I don't think the Swedes would like you stepping on any of their shoes - not just their blue ones. Here in europe, Adidas has always been popular. To the extent that their goods have always been highly faked. In the 80's every boy at school wanted a pair of black …

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

Posted on Yesterday, 22:52

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Awwww... What happened to all the pretty stickers? They are liquid now, living happily somewhere in the sewer line. This one with "Oliver Khan" funny typo as well (greets to the users from DE). :D khan.jpg What would you know, I was also recapping a SiS 630T board today to revive it (Jetway 630-TCF …

Re: P3 PC rebooting in the middle of the boot sequence

Posted on Yesterday, 22:47

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Unplug everything apart from RAM and a *basic* video card and try again. A 350w PSU for all that? You're really pushing it IMO.

Re: Aopen AX5T (i430TX) HDD performance

Posted on Yesterday, 20:37

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Those speeds (of the Fujitsu drive) are absolutely dire. That would not even be approaching what is possible with old-style multi-word DMA modes 1 or 2, never mind UDMA/33. Heck, even programmed IO mode 4 can do 16MB/sec, just you can't do anything else while it's doing it :-D One thing I always did …

Re: What are the unmissable MT-32 experiences?

Posted on Yesterday, 18:58

in Marvin \ Sound

in Marvin \ Sound

Gofer No Yabou for x68000 and Lethal weapon for Ibm pc. Actually Gradius II/Gofer is a really interesting example. It doesn't actually play back exclusively on the MT-32, it uses the YM2151 and MT-32 in sync - many of the square edged, digital, and drum instruments come from the YM2151, with the MT …

Re: Symphony Haydn 386DX/486DLC - plus case quandry

Posted on Yesterday, 15:11

in Marvin \ System Specs

in Marvin \ System Specs

The front panel is actually in pretty good shape, mainly dirt and not much in the way of scuffs or scrapes.... img20210508122339.jpg Nothing a bit of soap and water and a little application of a magic eraser couldn't improve: img20210508132222 (3).jpg Also gave the metal case a respray in Plastikote …

Symphony Haydn 386DX/486DLC - plus case quandry

Posted on Yesterday, 15:03

in Marvin \ System Specs

in Marvin \ System Specs

I had a 386SX-40 for a brief time in the early 90's, after moving on my mainstay of a 286-16, but very quickly upgraded to a 486DX2-50. As a result, my experience of the 386 era was pretty short lived, so I wanted to build a system that I would have ideally had instead of that cheap SX-40. Something …

Re: Help with a faulty DIN connector on a Socket 7 motherboard

Posted on Yesterday, 11:35

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Are you sure it's the keyboard connector at fault? There is often trouble on the area surrounding that port as it's historically where the CMOS battery is... And when it leaks the first symptoms can be keyboard errors. It could also be that the fuse on the keyboard port has gone (if your board has …

Re: Any standard frequency for a 386 in non-turbo mode?

Posted on 2021-05-07, 12:29

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ah - so more like the behaviour I observe on the 486 than the 286. Good to know. The underlying reason is to try and figure out whether I should configure the 'speed' display on my recently acquired case for my 386 project(s) to a static value (e.g. 40 high / 40 low) or to set it to a pair of values …

Re: Any standard frequency for a 386 in non-turbo mode?

Posted on 2021-05-07, 10:26

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, I understand. However, what I'm wondering is what the usual clock-speed behaviour is when turbo is not activated and the processor is not running at the normal on board oscillator speed (usually either 1:1 or 1/2 frequency of the can)? On most (not all) 286 designs it drops to 1/2 of the …

Re: I'm not able to get HDD recognized for my old 100mhz computer

Posted on 2021-05-07, 08:45

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Welcome to the forum! :-) If your BIOS has HDD size limits using another CF-IDE adaptor won't help you. You need either a BIOS update that removes the limitations or a drive controller card with its own boot BIOS that does not have the limitations or you may want to look into the XTIDE project. …

Any standard frequency for a 386 in non-turbo mode?

Posted on 2021-05-07, 08:39

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is there a standard rule-of-thumb for a 386 (SX or DX) when turbo is not activated? Is it always at the 14.318MHz clock, half the usual processor clock, or was it just completely dependent on the motherboard implementation? My experience with 286 boards is that they are usually 1/2 the nominal …

Re: Help with reviving an old computer

Posted on 2021-05-05, 10:53

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't know of any front mounted options. You can get ones that mount on a I/O card bracket on the back or some people have put the adapter in a standard IDE HDD caddy. You could make one yourself easy enough, but , Startech do sell one: 35baycf2ide.main.jpg I use them in all of my older systems - …

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

Posted on 2021-05-05, 07:54

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

vad4r wrote on 2021-05-05, 05:25: Talked with a friend who also collects... I think he might have a problem....

Re: Help with invalid OPCODE error message on Packard Bell

Posted on 2021-05-04, 19:40

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well done! That's a pretty mammoth job - I bet you were seeing solder points in your sleep afterwards! :-D At some point I have to revisit a homebrew Z80 backplane that I foolishly soldered several of the connectors on 180 degrees out of alignment... each one is a 96-pin DIN 41612 connector. I did 3 …

Re: ASUS Radeon 9800XT : Can I save its life ?

Posted on 2021-05-04, 19:33

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The base of that capacitor in that group at the top left (I think it's labelled as C1155???) looks odd - either it's leaked, or it has previously leaked and has been replaced and the flux not cleaned up; it's 'wet' looking compared to the others. There's a horrible blob of solder at the base of it …

Re: Best CPU for Gigabyte P4 Titan GA-8ITXE (rdram)

Posted on 2021-05-04, 19:21

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok, i had to update my knowledge about FSB, so what I wrote above is not true. However, I decided to check whether the board will handle HT. There is no mention of this in the bios. After installing WinXP - everest shows status "supported, enabled", there is two CPU usage charts in task manager, …

Re: FIC 386SC - unusual behaviour with ISA POST diagnostic card

Posted on 2021-05-04, 19:11

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Replacement TAG SRAM modules arrived today: img20210504195230.jpg I can confirm that for a Revision A2 board that following configuration is needed: - Eight modules of 32k by 8bit (256kbit) cache SRAM (e.g. UMC UM61M256K) - Two modules of 64k by 4bit (256kbit) TAG SRAM (e.g Samsung KM64258BP) The …

Re: XTIDE on 3C509B card

Posted on 2021-05-03, 16:36

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

BTW, if you want an EEPROM equivalent to a standard 128 or 256kbit 27C128/27C256 then you could do a lot worse than the Winbond W27C128/W27C256. It's pin-for-pin compatible and is still available quite cheaply from most suppliers.

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