Re: Say "Hi!" to the Renovation SSI-2001!

Posted on 2020-03-10, 16:16

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

Then I would suggest to make a smaller order: 3 PCBs at Aisler; because the SIDs will be expensive. The RCA jacks will have to be found (where?) and the 558 -- which we could leave out for the time being, since it would be a beta test. So you never built the card? The RCA jacks, NE556 in SSOP14 …

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Re: Say "Hi!" to the Renovation SSI-2001!

Posted on 2020-03-10, 14:50

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

Incidentally: Would someone be willing to take part in an order of ~10 PCBs for the Renovation 2001, which is up on github? I could be persuaded to order PCBs, Mouser parts and NE558s. For the SID: people need to supply their own SID, or optionally I would try to get ahold of some SwinSIDs (~15-20 …

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Re: Replacement AT Case turbo display

Posted on 2020-03-10, 12:19

by

by Benedikt

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

In that case you'll have to find an appropriately sized three-digit display and build a new module from scratch, either on perfboard or on a custom PCB. Alternatively, you can build the entire display from scratch using rectangular LEDs.

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Re: Say "Hi!" to the Renovation SSI-2001!

Posted on 2020-03-10, 12:01

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

i`m really interested into the software part, a opensource sid emulation core for stm32 would be really great :) Well, as mentioned before, the synthesizer part of the emulation core already exists and the author has apparently published it under GPL 3 license: STM32-SID-PLAYER . Adding bus …

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Re: The comprehensive list of all modern reproductions of vintage sound cards

Posted on 2020-03-09, 17:34

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

Added Benedikt's Revolution SSI-2001. I called it "Renovation SSI-2001", not "Revolution SSI-2001". That name might sound a bit silly, but it only changes two letters and is therefore closer to the original, yet different enough to prevent people from mistaking it for the original. Aside from that, …

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Re: Say "Hi!" to the Renovation SSI-2001!

Posted on 2020-03-09, 12:44

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

After some rearrangements of the SMD passives I have found enough space for a bypass capacitor for the 12V line. These rearrangements also allowed me to further minimize the visible differences. There's still four additional traces on the back side of the board, but they are now much shorter and do …

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Re: TNDLPT : Tandy Sound on parallel port

Posted on 2020-03-09, 12:27

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

I am mostly interested in the sequence of instructions that is equivalent to "out 0c0h,al" on a Tandy, because that is presumably the biggest difference. The equivalent is something like this: int lpt_stat = lpt_port + 1; int lpt_ctrl = lpt_port + 2; outp(lpt_port, cmd_byte); outp(lpt_ctrl, 0x0C); …

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Re: Connecting 2 soundcards to one speaker

Posted on 2020-03-09, 12:25

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

You can also build a passive mixer to prevent the cards from driving each others low impedance outputs. The basic idea is that you add series resistors to all outputs before you join them. Because it's just one or two resistors (mono or stereo) per output, you could technically hide them inside the …

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Re: Say "Hi!" to the Renovation SSI-2001!

Posted on 2020-03-08, 11:34

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

Okay, interesting way of programming the STM32 :) Regarding the bracket: Having not to drill would be a nice option. I did drill a bunch of blank Keystone brackets for the Adlib clone, but having a standard bracket would be even cooler. Any chance of supporting the above 9204 bracket? Yeah, but …

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Re: TNDLPT : Tandy Sound on parallel port

Posted on 2020-03-07, 23:13

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

I am mostly interested in the sequence of instructions that is equivalent to "out 0c0h,al" on a Tandy, because that is presumably the biggest difference.

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Re: TNDLPT : Tandy Sound on parallel port

Posted on 2020-03-07, 20:25

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

Can you summarize the overall programming technique for the TNDLPT? Most importantly: How do I enable it and how do I write a byte?

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Re: Video Emulation on VGA?

Posted on 2020-03-06, 22:44

by

by Benedikt

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Wait - so is there a Tandy emulator? I have a 512k Cirrus Logic chip. I believe that the approach linked by digger will only work with the 320x200 mode, not the 160x200 mode (correct me if I'm wrong), which would further explain why it would not work with every game, even if the game uses video …

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Re: Replacement AT Case turbo display

Posted on 2020-03-06, 22:19

by

by Benedikt

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The only component on the small PCB besides the LED display is a resistor, and it appears to be fine (although I must say I didn't actually test it with a multimeter). I guess I will test the traces tonight as well. That said, I'm nearly positive that the LED is toast, when I plugged it in wrong, …

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Re: Say "Hi!" to the Renovation SSI-2001!

Posted on 2020-03-06, 22:04

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

By the way: The RCA jack that is not present in the rendered pictures is a KLPX-0848A-2-B by Kycon. Filename RCA_jack.jpg File size 41.2 KiB Views 2973 views It is very similar to the RCA jack on the original card and at the same time the cheapest 90° RCA jack Mouser has on offer, which makes it …

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Re: Replacement AT Case turbo display

Posted on 2020-03-02, 22:56

by

by Benedikt

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This thread might be helpful: Fabricating a New Turbo Display

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Re: Question about Sierra's EGA640.DRV dithering

Posted on 2020-03-02, 22:19

by

by Benedikt

in Marvin \ Video

in Marvin \ Video

Apparently the ATI Graphics Solution supports a 640x200x16 graphics mode as well. https://www.vogons.org/viewtopic.php?p=830669#p830669 Yes, it does. And that mode has the most awkward memory layout I have ever seen: It has a red/green page and a blue/intensity page, just like Plantronics mode, and …

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Re: Video Emulation on VGA?

Posted on 2020-03-02, 21:59

by

by Benedikt

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

As for emulating Plantronics Colorplus modes, why would anybody ever want to do that?😂 There was zero support for that standard back in the day. Good luck, whatever fun project you're working on! 😃 Because it's awesome. I have PCem, I just want to play PX3 with Plantronics mode on a 486DX4/75. No, …

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Re: Paradise PVC4 CGA card : looking for video BIOS

Posted on 2020-03-01, 16:58

by

by Benedikt

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you are sure about the data integrity and data layout, then maybe it is a pinout problem. 27C256 EPROMs and 28C256 EEPROMs, for instance, have a slightly different pinout. Not different enough to destroy the chips, but different enough to result in garbled output. I made that mistake with a …

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Re: Question about Sierra's EGA640.DRV dithering

Posted on 2020-03-01, 16:44

by

by Benedikt

in Marvin \ Video

in Marvin \ Video

I still don't understand it completely. So in mode 13h, pixels were non-square, and they appeared to be "higher". However 640x00 EGA mode doubles the width, not the height, so I don't see how the technique you described works in this scenario. What am I missing? 640x200 doubles the width of the …

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Re: Tube Time: Announcing The Snark Barker, a 100% Compatible SB 1.0 Replica!

Posted on 2020-02-29, 08:19

by

by Benedikt

in Marvin \ Sound

in Marvin \ Sound

The choice of the two resistors for each voltage divider would also have to take into account whether the volume pots are linear or logarithmic, i.e. whether the goal is 70% of the input voltage or 70% perceived volume.

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