bola_dor wrote: ↑Thu Oct 31, 2019 12:49 am
About ULA bridge with the capacitor is there any risk involved? Beyond me making any sort of short circuit and ending up in fire
?
The only significant risk is an accidental short circuit caused by shorting out one of the other pins to pin 34 (0V/GND) or to pin 40 (+5V). A short circuit may damage the ULA. If you have steady hands, pressing the two leads on to the part of the chip pins where they enter the socket should be no problem. If your don’t think you can do this, or prefer not to try this, then just solder the capacitor on the bottom as I described earlier.
If you accidentally connect one lead of the capacitor to the wrong pin, there is a risk that you may crash the program and you will need to reset (power cycle) to get back to normal. It is unlikely that doing this will cause any permanent damage, but it’s best to try to avoid doing this.
When you first connect the capacitor, or if you don’t make good contact, you may see interference on the video picture. But no damage will result. This is just the capacitor charging up quickly.
It is also possible that adding this capacitor may make no significant difference, that is, it may not solve the problem.
Are you okay with knowing the numbering of DIL chip pins?
Also, just to be clear, when temporarily pressing the capacitor onto the chip/socket, the idea is that this is done with the computer powered up and with it displaying the vertical lines, the objective being to see if adding it makes any difference.
If soldering it on the bottom, this should be done with the computer switched off or disconnected.
Mark