MarkP wrote:Potentially silly question, but what type of screen are you recording from? CRT or LCD?
alien wrote:Thanks for the video tin. That's really interesting (and a bit of a shame).
Smonson wrote:I have a small request: could someone confirm whether Spectrum 512 works perfectly on the -20 or -38 shifter versions in 60Hz?
Using my verilog model (which is similar to the -38), it's perfect at 50Hz but totally broken at 60Hz.
tin wrote:I finally came around to fix my IMP board (I fried the Vsync diode somehow).
-added traces for C070713-002 8833 low/mid 50Hz using a full IMP chipset board
ijor wrote:But something is odd with this new trace on low rez (any chance you mixed up and it is actually on med rez?).
Can you make one or two more. Only with the full IMP chipset, only on LOW rez. If you can with two different powerup cycles. And please make sure that the screen is solid. That is, the start of the B2 (or whatever RGB signal you trace) should be exactly at the left border. Thanks a lot!
tin wrote:Regarding „banded“ and „shifted“ ...
ijor wrote:tin wrote:Regarding „banded“ and „shifted“ ...
I suspected something like that. But the trace bandwidth (50 MHz) is a bit too low and then it's difficult to analyze unless you know beforehand what you are looking for.
tin wrote:Here's the previous IMP set in 8ns and with dl3, dl6 and two different lowrez "shiftedleft" cases added.
ijor wrote:tin wrote:Here's the previous IMP set in 8ns and with dl3, dl6 and two different lowrez "shiftedleft" cases added.
Thanks once more again. But seems to me again that some of the traces might have the wrong resolution.
This looks like low rez, and not med rez: C070713-002IMP_med_50hz_dl3.vcd
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