Re: Music Quest MPU clone cards, anyone interested in them?

Posted on 2017-05-18, 16:33

by

by Jepael

in Marvin \ Sound

in Marvin \ Sound

well, the card works the same way as the MPU-401AT : both wavetable header and midi-out ports get the same midi data , so like Rackatack comments you have the option to connect a GM daughterboard and a MT-32 and with a simple sound selector you chose what you want to hear. The wavetable header will …

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Re: Goldstar 16-bit ISA multi I/O PC controller card, model IDE Plus V3L, 002.

Posted on 2017-05-18, 16:28

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

In reality external modem use commonly the DB25 connector as they use also the DTR/DSR signals. Those do exist on 9-pin port as well. Regarding serial ports on PCs, there is nothing more the 25-pin port can offer compared to the 9-pin port. (except the non-standard option of jumpering the connector …

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Re: Goldstar 16-bit ISA multi I/O PC controller card, model IDE Plus V3L, 002.

Posted on 2017-05-18, 12:38

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If these two size types of serial port on the backplate area are functionally equivalent, then what is the purpose of having two different sized ports, with a different number of 'pinout wires/pins'? I'm guessing, but due to the extra number of 'pinout pins/wires' on the DB-25 port, compared to the …

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Re: Goldstar 16-bit ISA multi I/O PC controller card, model IDE Plus V3L, 002.

Posted on 2017-05-17, 18:51

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

* Regarding the two ASYN male pin connections on the card's PCB. Would the corresponding DB-25 serial port connector (male) be for something called an "RS-232" port? Yes, COM (communication) ports use signals and voltage levels compatible with RS-232. * Would ASYN1 always lead (go) to a DE-9 serial …

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Re: Goldstar 16-bit ISA multi I/O PC controller card, model IDE Plus V3L, 002.

Posted on 2017-05-17, 14:41

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The serial ports (ASYN) just need an adapter that brings the wires to a bracket in unused slot next to the IO controller. There are a couple of different pinouts so don't assume the first you find is a correct one. But the bracket will have 9-pin serial and 25-pin serial connectors (DE-9 and DB-25 …

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Re: Wrangling 3 MIDI synthesizers

Posted on 2017-05-16, 19:58

by

by Jepael

in Marvin \ Sound

in Marvin \ Sound

From the website of that product: The Quadra Thru is MIDI-powered, and requires no batteries or power supply to operate with most MIDI products My initial thought is how can that work, as the MIDI specifications do not really allow or make powering devices possible in any way. But then I read from …

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Re: Great Tek HRGPEGA EGA card, jumper settings?

Posted on 2017-05-16, 18:58

by

by Jepael

in Marvin \ Video

in Marvin \ Video

Appears to select between the extra non-standard clock oscillators. EGA should only have 16.257MHz oscillator and it also utilizes the 14.318MHz from ISA bus. The 27.256MHz and 25.000MHz are non-standard extra oscillators for an EGA card. Could allow compatibility with other monitors instead of …

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Re: bad display on a isa vidéo card (VG-8000 / wd90c31a)

Posted on 2017-05-15, 15:24

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

By the looks of it there is some issue with video memory bus or chips. Specifically in one of the four memory planes, because in 256-color VGA mode you get one bad pixel and three good ones, and in 16-color mode the whole plane appears to be missing! If memory chips on the VGA card are socketed, …

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Re: Testing an AT (not ATX) power supply with a multimeter

Posted on 2017-05-15, 13:33

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes to measure voltage, set multimeter to measure DC voltage and connect common (black) terminal of multimeter to common/ground (black) terminal from power supply. Any black wire will do, for example one on molex connector, or even the metal case of the PSU. With multimeter red lead, poke around …

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Re: Roland ACB Adapter With High 1200mA For SC55 Help

Posted on 2017-05-14, 20:03

by

by Jepael

in Marvin \ Sound

in Marvin \ Sound

Of course :) Anyway, I gave this some more thought and 9VAC RMS voltage has a 12.7V peak voltage, which does match the about 12.5VDC the OP measured when some things are taken into consideration. As firage mentioned, transformer output voltages are specified under load, and so the voltage is higher …

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Re: Roland ACB Adapter With High 1200mA For SC55 Help

Posted on 2017-05-14, 19:07

by

by Jepael

in Marvin \ Sound

in Marvin \ Sound

The SC-55 really uses a 7805 to power it's electronics so it can take more than 9v - max is 24v or something IIRC. The only issue is the heat and the included heatsink is designed to work around 9v ratings. The higher voltage reading with no load is perfectly normal on unregulated PSUs. Actually it …

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Re: ISA PnP with two identical cards?

Posted on 2017-05-11, 21:34

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

what I don't understand about your idea (changing the PnP identifier one card at a time) is that it requires the card to have nonvolatile memory (eeprom?) and the appropriate hw/sw to write to this. Was that common in those days? I thought writing to eeproms required special voltages, like 25V or …

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Re: DOS boot menu

Posted on 2017-05-10, 14:33

by

by Jepael

in Marvin \ Software

in Marvin \ Software

Plain DOS 6.22 can print a description instead of the short menu item name. Is that enough? http://www.vfrazee.com/ms-dos/6.22/help/menuitem.htm

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Re: Dune "HERAD" Ad Lib Music Hacking

Posted on 2017-05-09, 20:02

by

by Jepael

in DOS

in DOS

I did some more research, and wSpeed is just "time increment" units at which rate to handle the midi events, and calling the playback routine makes a "time decrement" of 0x100 units. Or actually, just decrease the high byte, and if result is not negative it skips the midi processing. So in fact the …

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Re: For you CQM haters & lovers

Posted on 2017-05-04, 19:21

by

by Jepael

in Marvin \ Sound

in Marvin \ Sound

Nuked OPL3 is based on black-box testing of YMF262 connected to the Arduino. There is YMF262 die shot on siliconpr0n.org. But it's quality is not acceptable for such deep analysis. Does CQM has digital output? I thought it had integrated DAC. I'd possibly tried to emulate it, but i have no any card …

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Re: Sound Blaster Gameport,Y-Joystick Splitter Cable, Joystick and SC-55

Posted on 2017-05-04, 15:12

by

by Jepael

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does this work with one of these - http://www.pccables.com/joystick_splitter.html - or does it have to made in a certain way? Depends what kind of MIDI cables and joysticks you already have. I have to assume your MIDI adapter does not have joystick pass-through and you are trying to connect MIDI …

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Re: For you CQM haters & lovers

Posted on 2017-05-04, 10:21

by

by Jepael

in Marvin \ Sound

in Marvin \ Sound

(if someone could decap and write a CQM emulator that'd be cool too. The common Creative OEM consumer fm playback must be just as importantly preserved) That's a perspective I've not considered, as my quest has been Yamaha OPL, but writing a bit-perfect OPL emulator has lost its appeal as there's …

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Re: CVX-2 : covox adapter

Posted on 2017-05-03, 21:40

by

by Jepael

in Marvin \ Sound

in Marvin \ Sound

The parallel port used standard TTL logic levels when it was made Well, the manual specifically states that they are +5vdc: http://www.minuszerodegrees.net/oa/OA%20-%20IBM%20Monochrome%20Display%20and%20Printer%20Adapter.pdf See page 14. So I would expect any clone until the end of time to do …

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Re: Cirrus Logic gd5424 textmode issue

Posted on 2017-05-03, 19:59

by

by Jepael

in Marvin \ Video

in Marvin \ Video

Judging from the screenshot, it's pretty much the VGA BIOS ROM that is corrupted. Not if it boots correctly into DOS text mode in the first place. If the VGA BIOS ROM contents is shadowed and that copy in RAM gets corrupted, possible, but it should corrupt the code in BIOS as well so it would crash …

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Re: CVX-2 : covox adapter

Posted on 2017-05-03, 19:41

by

by Jepael

in Marvin \ Sound

in Marvin \ Sound

Is it confirmed though, that there exist parallel ports that output 3.3v rather than 5v? I mean, the standard has always been +5v, so a number of devices would have problems if someone suddenly changed it to 3.3v. So I can't really imagine that this actually occurs. It seems one of my VIA chipset …

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