Hugo Holden
Veteran Member
The color carrier is in the output signal and blue is fine. The other colors probably are too , you could check those in a similar manner. You could try running K scope or the Dazzler demo again now on the apple monitor.
Oh yesYeah, I guess I hadn't tried this monitor since we got the RAM issue sorted..
Check this out!
View attachment 1277314
I'll go through the rest of that tune-up procedure..
Given the note in the Northstar manual about using their Dynamic RAM with the Dazzler after a modification then I might have a go at building one now for myself and see if it works.>>> Yeah, I guess I hadn't tried this monitor since we got the RAM issue sorted..
I think we had a few different things going on. The RAM issue would have given us a 'solid' screen no matter what we did. If we had D6=1 (X4 resolution) and D4=1 (colour mode) then we should have got some colour out of it by playing with the lower four bits - but only if we had the variable capacitor and the two colour potentiometers tweaked correctly.
>>> Well done Dave, another well diagnosed process.
The only thing that was really wrong (in the end) was the RAM card issue - which was a bit mean...
>>> In a nutshell, the boards work but you need the right type of RAM, static & non buffered
A non-latched address bus was the key thing in the end. Some latched address bus cards may still work though, depending if they include a PHI2 clock.
DRAM seems to be a problem because of the refresh (or rather lack of) - but I wonder if that is true anymore with faster DRAM devices?
Dave
Well hold on now I just plugged it into my AppleColor monitor and the picture is actually blue!
The K scope seems like it is running faster than in my SOL, have you gone back to the 4MHz clock ?
And here's 4+ minutes of KSCOPE running @ 2MHz:
Good thought, but nope I've been using the front jack this whole time.