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MUS-2020 Prototype - Creative Game Blaster Clone

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First post, by matze79

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MUS-2020 Prototype - Creative Game Blaster Clone

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This is Gameblaster Clone derived from MUS-1099 Design.

Anyone who knows the MUS-1099 knows what problems it has.
In particular its amplifier has an immense power and there is a lot of background noise.

The MUS2020 design lacks the finishing touches, but is promising.

My first test was to build the part with SMD components and to change the noise level, which was successful.
Unfortunately the PCB has a few careless mistakes.

-> PCB is too thin (0.2mm) (In the XT the slots are relatively wide, I just tinned the ISA contacts of the card .., it's just HASL anyway)
-> PCB is too short
-> Conductor tracks could be thicker

The missing capacitors in the picture are filters 😉

As promised, the first audio recordings:

https://youtu.be/5joxSDhRhFE

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 1 of 9, by keropi

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great to see an update on this, I also built the original card and it had severe noise issues...

🎵 🎧 ⏳ ⚡ PCMIDI MPU , OrpheusII , Action Rewind , Megacard and 🎶GoldLib soundcard website

Reply 3 of 9, by Benedikt

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While we're at it, you could also add a few keep-out areas for the copper pours and try to keep the different parts of the ground plane connected in as many places as possible to avoid unwanted antennas.

Reply 4 of 9, by matze79

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Thanks for suggestions!

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 5 of 9, by matze79

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https://github.com/matze79/MUS-2020

uploaded Files, as original project is also GPL and this is based on it.

Note that the Card needs some small Changes to fit perfect, but Hardware is working very well.

All 74 Chips should LS Types.

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 7 of 9, by matze79

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There is a Error in the Card Design, the R1 Resistor is 1k and could cause missing Notes.
If using other Logic ICs then LS Series.
It should 4.7kOhm (Thx Scorp).

What i not understod yet is why D7 Dataline in this design is connected over 1k to Ground but D0 to D6 to VCC.

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Fixed PCB Size, and some other Stuff optimized.
(New Eagle Files not yet uploaded)

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 9 of 9, by maxtherabbit

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carlostex wrote on 2021-04-27, 20:04:
maxtherabbit wrote on 2021-03-02, 16:28:

I know the OPL3 I/O ports collide with the CMS - but what about the dual OPL2 on the SBPro 1?

Same

Meaning the same port collision occurs? Or you are asking the same question 🤣

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