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KimJorgensen / KungFuFlash

Cartridge for the Commodore 64 that packs a punch
zlib License
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How crucial are the values of R1, R5 and R6 resistors? (510R) #169

Closed dburr closed 1 year ago

dburr commented 1 year ago

Putting together my Kung Fu Flash and have run into a bit of a snag. I don't have any 510R resistors for R1, R5 and R6. The only values close to that in my resistor kit are 470R and 560R. Can I substitute one of these for the 510Rs? Looks like R1 is a dropping resistor for the LED, so changing that resistor would only make the LED slightly brighter or dimmer, no big deal. But R5 and R6 seem to be a different story, they appear to be tied into the Menu and Special buttons in some way. (pull up/down?) Would changing these affect some sort of timing in some way? Forgive me if this is a noob question, I'm not hugely versed in the intricacies of digital electronics.

KimJorgensen commented 1 year ago

The actual value of R5 and R6 resistors is not that crucial as they act as a pull up. For R4 I'll go with 470R