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

[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.

IMG_0970.jpg

IMG_0971.jpg

Did some tidying up of the PCB silk Screen:

Master Sound 2 Cart_2025 release ver-TOP.png

Master Sound 2 Cart_2025 release ver-BOTTOM.png

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

Master Sound 2 Cart_2025 release ver.zip

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

IMG_1002.JPG

IMG_0998.JPG

[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

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. :D

[agranlund]

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

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. :D

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

[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

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!