Re: What's this card

Posted on 2020-07-10, 08:21

by

by Jonas-fr

in Marvin \ Video

in Marvin \ Video

Thanks! I must admit that I saw my share of video cards but never noticed this brand. I'm adding the datasheet to my project folder and keep looking for the DPSW settings. I noticed this analysis of a closely related 386 luggable so I'll try the settings on mine: http://oldcomputer.info/portables/ …

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Re: Open source "Dallas" RTC replacement

Posted on 2020-07-10, 08:15

by

by Jonas-fr

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've looked into sourcing parts and building these myself as well but the DS12885 does not seem to be a cheap acquisition in the required SOIC packge type.. I see some at <$2 so still acceptable price IMO (but again the shipping cost are ruining all the deals) http://www.utsource.net/sch/DS12885S. …

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Re: Minimalist SC-55 setup - Naive dreams about reverse engineering the SC-55

Posted on 2020-07-10, 08:12

by

by Jonas-fr

in Marvin \ Sound

in Marvin \ Sound

@cyclone3d: I've got a SCB-55 but will sell it for reasons I stated just above your comment : ) @darry: I explained in my first post why Sound Canvas VA isn't on the table : ) Pushing further my search on this topic I stumbled upon this gem of a project (https://www.youtube.com/watch?v=0aCy3ccLZzo) …

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Re: What's this card

Posted on 2020-07-09, 22:46

by

by Jonas-fr

in Marvin \ Video

in Marvin \ Video

Thanks ! I edited the post according to your info. Would you mind if I ask how did you noticed that? Did you already know about MUSIC SEMI chips ?

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Re: What's this card

Posted on 2020-07-09, 22:15

by

by Jonas-fr

in Marvin \ Video

in Marvin \ Video

I just found this link, I'll try the utility since it seems to work with this card chipset !

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Re: Minimalist SC-55 setup - Naive dreams about reverse engineering the SC-55

Posted on 2020-07-09, 21:54

by

by Jonas-fr

in Marvin \ Sound

in Marvin \ Sound

@cyclone3d: I've got a SCB-55 but will sell it for reasons I stated just above your comment : ) @darry: I explained in my first post why Sound Canvas VA isn't on the table : ) Pushing further my search on this topic I stumbled upon this gem of a project (https://www.youtube.com/watch?v=0aCy3ccLZzo) …

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What's this card

Posted on 2020-07-09, 21:51

by

by Jonas-fr

in Marvin \ Video

in Marvin \ Video

I stumbled upon this video card on a really nice lunchbox 486 (basically a Dolch clone). The computer has an embedded monochrome flat panel hooked directly on the card (multicoloured wires at the back) but also got a VGA port on the bracket and a switch to select between LCD and external/VGA display …

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Re: Minimalist SC-55 setup - Naive dreams about reverse engineering the SC-55

Posted on 2020-07-09, 20:43

by

by Jonas-fr

in Marvin \ Sound

in Marvin \ Sound

Thanks for your feedbacks Oetker and darry ! @Oetker : So if the SC-55 applies effects on top of the sound this whole ordeal will fell through indeed. I happen to have a NIB SCB-55 but I'll sell it because uno: as I'm downsizing (space issues) I feel awkward to use it and keep a hollow box with …

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Re: Minimalist SC-55 setup - Naive dreams about reverse engineering the SC-55

Posted on 2020-07-09, 13:46

by

by Jonas-fr

in Marvin \ Sound

in Marvin \ Sound

Thanks for your input keropi. I wasn't aware of it so I wil keep an eye on it, but the topic isn't on the closest/more faithful solution but on getting actual SC-55 sound bytes on a waveboard (Dreamblaster on my case since it has flexibility to flash any soundfont that is under 64MB) 😀

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Re: Open source "Dallas" RTC replacement

Posted on 2020-07-09, 13:42

by

by Jonas-fr

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Why not just buy a brand new DS12887+ from digikey? Because I want to make the next maintenance to be easy and don't want to continue the ecologically-desastrous habit of throwing an otherwise good chip just because its battery is bad. If it was up to me I would ban such wasteful products from the …

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Minimalist SC-55 setup - Naive dreams about reverse engineering the SC-55

Posted on 2020-07-09, 13:36

by

by Jonas-fr

in Marvin \ Sound

in Marvin \ Sound

Owner of a SC-55 here, I want to shrink down my setup (486 computer hooked to a SC-55 via MIDI) while retaining the SC-55 abilities. I'm currently focusing on getting a 1:1 copy of the SC-55 soundfont (I won't go in the debate between what's the closest soundfont today ,there's some very good clone/ …

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Re: Open source "Dallas" RTC replacement

Posted on 2020-07-07, 10:43

by

by Jonas-fr

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah the C variants have many quirks it seems. I just located a clear DS12887 datasheet that states that 12887 is a direct replacement for a DS1287 and just add some more RAM so it would mean that I can go with the ALT12887 project. Thanks for your feedback !

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Re: Open source "Dallas" RTC replacement

Posted on 2020-07-07, 10:34

by

by Jonas-fr

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

ALT12887 Thanks ! I was not aware of that project, I will check this out. Just a quick question, the datasheet of my chip says that it's DS1287 compatible (cf. page 2 on https://www.datasheets360.com/pdf/7995962487213876287), what's the difference with a DS12887? I think they're pin compatible and …

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Open source "Dallas" RTC replacement

Posted on 2020-07-07, 09:21

by

by Jonas-fr

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I recently stumbled upon a nice 486 lugable akin to a Dolch (dedicated topic is yet to come) with a battery dead ST MK48T87B RTC (DS1287 pin compatible if I'm not mistaken). As the whole machine since to be build to be maintainable (not mil spec but pretty close) it's socketed so I intend to replace …

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Re: Latest chipset / motherboard with dual floppy support

Posted on 2020-06-17, 12:43

by

by Jonas-fr

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I got a DQ670W and just tested. No support for a 5.25" drive sadly. Even with the option for a FDD enabled in the BIOS Win10 doesn't see my 5.25" drive (which is working in other machines) It's not entirely a surprise given the documentation : - https://www.intel.com/content/dam/support/us/en/ …

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Re: FMonster, the monster of sound synth

Posted on 2019-07-23, 08:00

by

by Jonas-fr

in Marvin \ Sound

in Marvin \ Sound

Impressive ! Take all the time you need a be sure that we are behind you on this project ! I'm eager to see the results 😀

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Re: Sherlock Holmes : sound card edition

Posted on 2019-03-28, 20:37

by

by Jonas-fr

in Marvin \ Sound

in Marvin \ Sound

Wow! that was a quick investigation, thanks! The seller just told me that the card has been sold to someone else; I guess I didn't miss much : )

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Sherlock Holmes : sound card edition

Posted on 2019-03-28, 13:51

by

by Jonas-fr

in Marvin \ Sound

in Marvin \ Sound

Hi, This is a picture of 2 sort of soundcards a seller sent me. I easily identified a Creative Audio PCI 3000 on top but cannot for the life of me identify the bottom one. https://i.imgur.com/jSb8bq3.jpg The mysterious card looks like having a DIP16 (or DIP18) Philips IC in the middle and four big …

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Re: FMonster, the monster of sound synth

Posted on 2019-02-18, 22:02

by

by Jonas-fr

in Marvin \ Sound

in Marvin \ Sound

Even without understanding the impressive feat of making these protos, these pictures are astonishly pretty ! Keep up the good work

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Re: XT/CGA laptop dissection

Posted on 2019-02-17, 13:18

by

by Jonas-fr

in Marvin \ System Specs

in Marvin \ System Specs

If there's anyone else out there with a Victor V86P that has a dead (or missing) PSU and wants to use an existing 8.5V PSU (like the one for the Playstation2 suggested earlier), I've reverse engineered the battery charging circuitry that's in the original PSU, and made a little board to implement …

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