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Re: kodak80 blog
Posted: 08 May 2025 10:57
by 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
Re: kodak80 blog
Posted: 11 May 2025 04:37
by 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
Re: kodak80 blog
Posted: 24 May 2025 10:17
by 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
Re: kodak80 blog
Posted: 24 May 2025 13:03
by DoG
Nice with some small projects. Looks great the first one.
Re: kodak80 blog
Posted: 25 May 2025 05:41
by 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
Re: kodak80 blog
Posted: 26 May 2025 18:29
by agranlund
kodak80 wrote: 25 May 2025 05:41
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 :)
Re: kodak80 blog
Posted: 26 May 2025 21:41
by kodak80
agranlund wrote: 26 May 2025 18:29
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.
Re: kodak80 blog
Posted: 08 Jun 2025 04:51
by kodak80
agranlund wrote: 26 May 2025 18:29
kodak80 wrote: 25 May 2025 05:41
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
Re: kodak80 blog
Posted: 04 Jul 2025 09:13
by 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.
Re: kodak80 blog
Posted: 04 Jul 2025 11:05
by DoG
kodak80 wrote: 04 Jul 2025 09:13
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!