kodak80 blog

[kodak80]

Really simple design with a single chip. The schematic I worked from was missing a GND connection which I found when looking at the one I had opened.

Screenshot 2025-05-08 200009.png (63.34 KiB) Viewed 1192 times

[kodak80]

Confirmed that these recreated Mastersound II fit the original case. Ignore my broken one. Was in a rush to get it open...

New PCB fits perfectly.

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IMG_0971.jpg (229.82 KiB) Viewed 1160 times

Did some tidying up of the PCB silk Screen:

Master Sound 2 Cart_2025 release ver-TOP.png (164.18 KiB) Viewed 1159 times

Master Sound 2 Cart_2025 release ver-BOTTOM.png (198.23 KiB) Viewed 1159 times

Here is the Gerber for anyone wanting to get these made.

Master Sound 2 Cart_2025 release ver.zip

(74.24 KiB) Downloaded 42 times

Code: Select all

Part list Master Sound 2 Cart_2025 release ver
Recreated by kodak80

Part     Value               Device              Package       

C1       10uf                CPOL-EUE2-5         E2-5          
C2       10uf                CPOL-EUE2-5         E2-5          
C3       10uf                CPOL-EUE2-5         E2-5          
C4       1.5nf               C-EU050-030X075     C050-030X075  
C5       47pf                C-EU050-030X075     C050-030X075  
C6       100nf               C-EU050-030X075     C050-030X075  
D1       1N4148              DIODE-D-5           D-5           
D2       1N4148              DIODE-D-5           D-5           
J2       MicGND              CONN_01             1X01          
J3       Mic                 CONN_01             1X01          
R1       390R                R-EU_0204/5         0204/5        
R2       100K                R-EU_0204/5         0204/5        
R3       100K                R-EU_0204/5         0204/5        
R4       3K9                 R-EU_0204/7         0204/7        
R5       47K                 R-EU_0204/5         0204/5        
R6       3K9                 R-EU_0204/5         0204/5        
ZN449E                       DIL18               DIL18         

[kodak80]

Okay, next cartridge I am looking to re-create is the Microdeal Stereo Playback cartridge. The main chip is a AD7528JN DAC:

https://www.atarimania.com/utility-atar ... 25563.html

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[DoG]

Nice with some small projects. Looks great the first one.

[kodak80]

The photos of the Stereo Playback cartridge above are of the original I purchased as a starting point.

Here is the schematic I have created from the original cart:

schematic.png (193.03 KiB) Viewed 1077 times

I have sent the prototype PCB for fabrication and now wait...

Quartet v1.5 from Microdeal makes use of this Playback cartridge for stereo output.

[agranlund]

Quartet v1.5 from Microdeal makes use of this Playback cartridge for stereo output.

I believe I added support for this cart in ScummST and BasiliskII as well, but I didn't have the hardware to test so it was done blindly and may or may not work

[kodak80]

I believe I added support for this cart in ScummST and BasiliskII as well, but I didn't have the hardware to test so it was done blindly and may or may not work

Good to know and will give SummST a test on the weekend.

[kodak80]

Quartet v1.5 from Microdeal makes use of this Playback cartridge for stereo output.

I believe I added support for this cart in ScummST and BasiliskII as well, but I didn't have the hardware to test so it was done blindly and may or may not work

ScummST games work with the Microdeal Stereo Playback cartridge. Set the Sound driver as on the photo.

IMG_1105.jpeg (502.63 KiB) Viewed 999 times

[kodak80]

I wanted to test the new Raven CKBD adapter with my Mega ST so have extracted the Micro ATX Atari ST Eiffel schematic to a standalone schematic and made a custom PCB layout for testing.

Prototype PCBs arrived today.

e15bb014902dfefe2a9ab19a499d30d7.png (183.04 KiB) Viewed 959 times

Just waiting on the RJ12 connectors to get this fully built. Was not totally sure on the RJ12 pinout but hopefully its correct.

[DoG]

Just waiting on the RJ12 connectors to get this fully built. Was not totally sure on the RJ12 pinout but hopefully its correct.

I got confused with Tx/Rx when I did my Eiffel pcb a few years ago. Or if I got the footprint wrong, it was flipped, I can't remember. But anyhow it was 50% chance I did it wrong so of course it was wrong. So I had to redo a new version.

I hope yours will work right away!