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bvenneker / Chat64

C64 Chat Cartridge, 2023
GNU General Public License v3.0
13 stars 2 forks source link

What has changed between THT Rev.3.7 and Rev.3.8? #14

Open vk5ln opened 1 month ago

vk5ln commented 1 month ago

I have just received some THT Rev.3.7 boards from my PCB vendor and I see that there is a new revision 3.8. What was updated? Could a changelog be added to detail what has been updated/changed with each revision. If I populate a Rev.3.7 PCB will Chat64 work OK?

bvenneker commented 1 month ago

The change is minor. We decided to trigger both reset and the NMI signal with a transistor in rev 3.8. In revision 3.7 we used a transistor to trigger the reset signal and a logic port to trigger NMI. In 3.8 both use a transistor. Yes, it will work just fine. I also still use revision 3.7 for development.

vk5ln commented 1 month ago

Thanks for the information. After I posted I did compare the two schematics and did notice the extra transistor. Consider this issue closed :-)