stedy wrote:rj1 wrote:I had similar issue on a Mega 1 as OP, where the display would jump diagonally by about 1-2cm every few seconds on one TV (Philips LCD) but would be fine on another TV (Sharp LCD).
I added a 1N4148 diode and a 10uF capacitor for the BLANKING SCART pin 16 as on your schematic and it solved the issue.
it appears to work.walterg74 wrote:
Hi Ian, should this one work on an STf ? I could not get it to work with any of my cables, on a 1084S-D2 monitor (not with scart + scart/db-9 adapter, not with direct philips type cable), not with a PVM using scart cable.
Today I luckily acquired an SM124 and image came up fine, so Atari should be working correctly (side note, the othe monitors and cables work fine with my other Ataris).
Give it a try, the switch + 2 resistors on the CSYNC signal should cater for all eventualities.
A Sony PVM should work fine with Hsync/Vsync, they do tolerate a reasonable amount of variation on TTL Csync too.
thanks for the reply. I have 3 Sony PVMs (they just have the one external sync thouh, not separate h + v).
When using those switching sync on and off I did see the screen appear briefly, so something is getting there but not quite right, so maybe they don't tolerate that much?
I was thinking I can also try addind the resistor inside the scart casing of the cable I already have as a test.
If that doesn't work (or even if it does) I will go ahead and buld my cable from scratch following the model.