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Re: Schneider Euro PC

Posted on 2022-02-18, 00:27

By the way, is it normal/common that such oscillator crystals are, uhm, "loose"as seen in the picture ? 🤷‍♂️ I always assumed that these components are fragile and thus mechanical stability is important. The very few of these KHz crystals that I can remember of were attached to the PCB somehow ( …

Re: Schneider Euro PC

Posted on 2022-02-16, 20:46

Here’s a closeup of the battery area. https://www.dropbox.com/s/jfnb4vsflysklyf/Photo%2015.2.2022%2C%2015.47.25.jpg?raw=1 The metal tube is a quartz crystal. Perhaps that ~14MHz one.. The metal tube is a quartz crystal, indeed. It's not a 14.318MHz one, though but the 32.768kHz quartz for the real- …

Re: DOS32AWE - DOS/4G compatible DOS Extender with Sound Blaster AWEUTIL MIDI synthesizer support for Protected mode,V

Posted on 2022-02-04, 10:46

The AWE32 does "hardware-assisted port redirection" by triggering an NMI when a MIDI port is written. That's why AWEUTIL doesn't need EMM386. It seems typical DOS extenders don't reflect the NMI to real mode, as they reflect standard IRQs to real mode. All you have to do to get AWEUTIL work with …

Re: IBM 5151 shaky/jittery image

Posted on 2022-02-02, 22:57

Thank you for the advice, I' ll remove the pots and try to set their value outside of the circuit then. I guess that trying to set these pots with the monitor turned on is not really a safe option (correct me if I am wrong). I do not have any tools for discharging crts, so now I am just waiting for …

Re: Audio problem with Ensoniq S-2000

Posted on 2022-02-02, 22:47

Soundscape 2000 cards are known for developing bad caps, so my bet is also on bad capacitors. More precisely, it's about the electrolytic SMD caps, that's the silver cans with "45 10 16V" or "46 1 50V" printed on them. Your card has 16 of the former type and 4 of the latter. You would need proper …

Re: IBM 5151 shaky/jittery image

Posted on 2022-02-01, 21:01

It seems that you may be right. Probably pots are broken - after removing the glue and moving them around i can get maximum values of: V-hold - 93kohm (should be 100-250kohm if I read correctly) V-height - 235kohm (should be 250kohm) V-linearity -49kohm (should be 50kohm) The problem still persists …

Re: EGA DOS benchmarks?

Posted on 2022-02-01, 09:37

On classic CGA/EGA/VGA cards, there is no separate memory clock and pixel clock, instead, the memory timing is derived from the pixel clock (or the double pixel clock in 320-pixel modes). The pixel clock on CGA and low-res EGA is 14.318MHz, whereas the pixel clock on VGA is around 25 MHz. As the …

Re: Question about DOS 16 color modes.

Posted on 2022-02-01, 09:18

I know Q Basic (not sure about GW Basic) is capable of some kind of 16 color mode, where the color of each pixel is specified by single PSet statement. I'm not sure how it does that. When PSet is used in 16 color mode, Does it switch beteween all 4 color planes and set the color of the pixel? If so …

Re: Question about DOS 16 color modes.

Posted on 2022-01-31, 22:34

Thanks. I'll have to check that out. I also discovered something. If I set the chaining bit in graphics card sequencer register 4. It does something quite interesting (at least in DosBox, not sure about real hardware). It changes it from the normal EGA image-planar mode (where you have to select …

Re: IBM 5151 shaky/jittery image

Posted on 2022-01-30, 10:52

Hello, I have a problem with my IBM 5151 - after turning on, it displays jittery image (out of sync - like, I guess). The monitor behaves this way since about 10 years ago, though there were some brief, random moments when it displayed image correctly. There is no difference in display quality when …

Re: Old DOS laptop multi-tasker?

Posted on 2022-01-30, 10:30

I have an old DOS laptop at my mother's house with which I like to play, and I sometimes like to program on it. Now, I would like to run two or more programs at once on it so I can share data and refer to one thing while working on another project. What program do I use to do that? Where online can …

Re: Sound Blaster CT1600 overheating

Posted on 2022-01-28, 23:27

All of the three buffer/driver chips seem to be connected to the 8 ISA data bits. If they get hot, it looks like they fight each other driving data to the ISA bus. The left one is used to drive data from the ISA bus to the CD cable and vice versa. It must not get hot at all if the CD drive is not …

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