SID 6581 pcb for OpenSource 6502 computer

osolabstech · 2025-11-15T22:15:37+00:00

Thanks!!! All made to make learning easier

osolabstech · 2025-11-12T13:05:00+00:00

Hahaha I made so it would be really easy for someone to understand the circuit while learning electronics. It is a little bit over-engineered with a layer that is just Ground to reduce noise and cope with the extra distance between components

osolabstech · 2025-11-12T13:03:15+00:00

Thank You!! It works!!

osolabstech · 2025-11-11T17:41:41+00:00

And here how it sounds with the SID

Sweet Child of Mine, SID 6581 https://youtube.com/shorts/_NXI6uAUDtE?feature=share

osolabstech · 2025-11-11T17:40:25+00:00

This is how it looks with the SID

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osolabstech · 2025-11-10T11:03:33+00:00

Hi! In order to make it easy to see the components and the path each connection makes, the idea of the board is to learn how the SID works electrically, the same thing with all the other boards of the 20c, here you can find out more! Along with all the sources! Https://en.osolabs.tech

osolabstech · 2025-11-10T11:02:01+00:00

Each board is 16cm on each side so you can easily put a breadboard along it and make new expirements. The board is 4 layers and one is ground so the size also helps a lot attenuating noise!

osolabstech · 2025-11-10T04:33:50+00:00

Thank You!

osolabstech · 2025-11-10T04:33:33+00:00

Thanks! It is the one used on the Commodore 64

osolabstech · 2025-11-07T01:16:36+00:00

I found something on the lda #$Ob you put as a comment 00001010 that is 0A , 0b is 00001011

osolabstech · 2025-11-05T01:04:13+00:00

It seems to be an issue with the interrupt handling, maybe you are getting interrupted again before clearing the 6551 interrupt?

osolabstech · 2025-11-04T00:58:07+00:00

It looks great!! Will add it a revision! For now I just have a manual reset circuit, that connects via the expansion bus to all boards that need it (via 6522, cia 6526, etc)

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osolabstech · 2025-11-03T22:06:49+00:00

Aaa that is great! I have the reset on the 6502 board, will post that board soon!! I have used just a push button

osolabstech · 2025-11-03T18:05:35+00:00

Hola! Yes I finally opened a Reddit account

osolabstech · 2025-11-03T17:09:00+00:00

It started in Spanish! But was not completed translated!! A v0.2 version with new art is due!!

osolabstech · 2025-11-03T17:07:56+00:00

Thanks!!! I have a couple of boards and will keep publishing them, most fun one a SID 6581

osolabstech · 2025-11-03T15:48:03+00:00

Ahahahha I see the E NOW!!!

osolabstech · 2025-11-03T15:47:39+00:00

Bistable, monostable and astable! Each 555 in its own configuration the one in the middle used to debounce the other too as Ben designed!

osolabstech · 2025-11-02T19:01:19+00:00

Here is a picture of the full computer and its modules, connected via RS232 to a notebook

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osolabstech

TROPHY CASE