Re: Replacing a 80C42 KBC with a 83C42 KBC?

Posted on 2020-05-27, 14:12

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It will probably be no issue but it could be. I came across so many things that "shouldn't cause any incompatibilities" but did that I get instantly cautious when I read "enables the keyboard controller to respond instantly to all commands". And many people desolder ICs by just cutting their legs …

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Re: Replacing a 80C42 KBC with a 83C42 KBC?

Posted on 2020-05-27, 10:54

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just out of curiosity I checked the Winbond 83C42 datasheet, too. I didn't know it even existed. Regarding your problem this... Winbond Electronics Corporation has developed a fast keyboard controller and BIOS to improve the performance of IBM PC/ATâ 386äDX/SX and 486äDX/SX machines and their …

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Re: How to configure this turbo display ?

Posted on 2020-03-25, 16:51

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This chip is a serial EEPROM. There must be a little microcontroller hidden somewhere on this pcb. Maybe it is integrated into the LED casing? The EEPROM alone is not able to control the LED digits. Anything interesting on the other side of the display?

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Re: 5.25"(1/4") floppy drive color and usage ?

Posted on 2019-03-29, 11:56

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

In 1991 my first own PC a Highscreen 286/12MHz came with only a 5.25" drive. I bought the 3.5" drive for it not much later. The first dead-cheap no-name Genius clone mouse I bought for it came with drivers on a 5.25" floppy only. Same for the ET4000 ISA card that replaced the Hercules monochrome …

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Re: And then there was white smoke...

Posted on 2019-02-28, 10:20

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

BTW: Even if the lead is rated for 7 amps only, it can bear a lot more for a short period of time without glowing and insulator melting, which is enough for the PSU to sense the over current and shut down. How can a 35A power supply differentiate between a normal 10A load and 10A flowing though a …

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Re: Processor choice for later dos games

Posted on 2019-02-27, 14:29

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

:) You made me curious. I didn't know this was possible. I thought I had already set everything to "high". I own the game from the time when it was in the "10 DM Software Pyramide" in big electronic stores, so around 1996-98. I never liked it and regretted the purchase afterwards. Maybe now, 20 …

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Re: And then there was white smoke...

Posted on 2019-02-27, 13:45

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This thread brought back a distant memory, from the '90s... I did the same, after cleaning and reassembling my PC... Floppy connector off by 1 pin, luckily it refused to start. My PSU was just 200W. This is what I meant. I think, floppy connector off by 1 pin happened to most of us at some time. It …

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Re: And then there was white smoke...

Posted on 2019-02-27, 12:12

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Good PSUs have short circuit protection and would have cut out in a shorting situation like this. You have to detect the short circuit in the first place. In this case the circuit (PSU - red wire- floppy w/dead short - black wire - PSU) wasn't a dead short - Putting the floppy connector off by 1 is …

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Re: Processor choice for later dos games

Posted on 2019-02-27, 10:58

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Magic Carpet , ... also require something like a Pentium III 700 to run smooth in 640x400/480 mode. If you talk about this Magic Carpet , this came out 1994 and is unplayable fast on my P200. Not sure why you would need a P3 for it. In general, one should not aim for 60fps if the original …

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Re: Windows Vista Retro Machine ideas

Posted on 2019-02-21, 14:24

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have one running since a few weeks. Athlon II X2 280, 8GB DDR3, HD7790, 240GB SSD on an Asrock 880GM main board. I know it is not really retro, but the MB has all the legacy interfaces: Floppy, RS232, Parallel, IDE... And I had most if the parts laying around anyway. So, it is a very good bridge …

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Re: PS/2 Keyboard to USB Converter Problem

Posted on 2019-02-15, 11:30

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I guess this is more a problem of your keyboard. Just google N-key rollover.

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Re: DOS Video Issue @ 700x400 via VGA

Posted on 2019-01-28, 15:57

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

And I completely overlooked it in the original post despite reading it twice. Is it just my computers getting old or me too? 😉 But thanks for highlighting it!

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Re: DOS Video Issue @ 700x400 via VGA

Posted on 2019-01-28, 14:15

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So Murugan knows which cards are used by w0lf42? Interesting... ;):D Anyway, since this happens with two different video cards, my first theory of having a defective card is kind of rejected. Do 2 different cards really show exactly the same problem with the missing scan lines in text mode? …

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Re: DOS Video Issue @ 700x400 via VGA

Posted on 2019-01-28, 13:50

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Since this is in text mode it is most probably an issue with your graphics card. Which one is it?

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Re: How long do old-floppies last?

Posted on 2019-01-27, 08:45

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I had just recently bought a used book about assembly programming from 1994 which came with a 720k floppy. Before I could even look if the disk was still readable I accidentally put the book on a magnetic mat that I use to hold screws and small parts. Assuming that this were the terminal blow to the …

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Re: Unboxing a new old Windows 98 PC!

Posted on 2018-12-01, 11:13

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Except this PC is from 2000 or 2001 if you see the Computer of the Year sticker on it! Is the graphics card horrible because of its slow or for some other reason? It is most probably from 1998 or 1999. The Y2K compliance craze was before the year 2000. I remember well, when we were swapping out …

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Re: AWE64 Gold vs non Gold: What’s the deal?

Posted on 2018-11-15, 16:56

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by realoldguy23

in Marvin \ Sound

in Marvin \ Sound

What about what I asked regarding where this is a good fit? I'd say Socket 3 (486) to Socket 8 (PPro)/Slot 1. My Value is in a PPro and I'm happy with it. :) Never longed for the Gold. DOS Games of the second half of the 90's support the AWE natively and require at least a fast Pentium if you want …

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Re: Computer of Mystery... What is this?

Posted on 2018-11-12, 14:58

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

dionb wrote: ...Chipzilla lost interest. You're surely reading theregister.co.uk regularly, do you? 😉

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Re: Micronics motherboard Pentium 200 classic.

Posted on 2018-11-10, 16:11

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Got it from ebay, Intended use: older DOS games, even not period correct hardware-wise. Considering this you might want to stay with the P200 non-MMX. It is already too fast for older DOS games. A 233-MMX will only worsen the situation. You might want to go the under-clock route. The P200 can be …

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Re: Unexpected cpu cache result.

Posted on 2018-11-05, 10:48

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by realoldguy23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't think that is true for all Intel 486 DX4s. This is from the "EMBEDDED WRITE-BACK ENHANCED IntelDX4™ PROCESSOR" datasheet from October 1995: CKMUL_Intel486DX4.PNG And this if from the "Am486® DX4 3-Volt Processor - High-Performance, Clock-Selectable, 3.3 V, 32-Bit Microprocessor" datasheet …

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