Andrew Hutchings

Took a closer look at the Amiga 2000 I was given with this fault. Turns out that it has a 8373R3 which is a Super Denise. Setting the jumper correctly...

Another thing that _might_ cause noise is that the spare inputs in U5 were left floating, this is usually bad in CMOS ICs.

@Bloodmosher did you have any glitching (not sparkling) before the setting change?

Something else to note, I've tried an A2000 rev 4.4 today with the board using both R3 and R4 Super Denise. I get a really noisy picture unless I jumper...

> I've got a 4.1 that I test regularly with... for Super Denise probably only R3 though. Nothing super obvious on this page that describes revisions (http://amiga.resource.cx/mod/a2000.html). Other than 4.4...

> Worth trying out the 47pf cap and config changes; all the ones I make I just do both... Or I just leave the jumper on Denise :D As for...

For those interested, after some testing I have upstreamed my rev 2 design to hoglet67/RGBtoHDMI#197. Amongst other things it has a place (C6) to add the optional 47pF capacitor and...

Photo of rev 1, rev 2 bottom. 

> If leaving out U5 it will get confusing to have these in circulation, as in the picture where you have it set for Super Denise but yet U5 is...

This has been rebased and modified to work against current master.