Floating pin 12 on LM1889 colour modulator
Posted: Fri Oct 18, 2013 11:45 pm
While investigating the possibility of S-video output, I pulled out my LM1889 in order to check the resulting b/w image and to bend pin 13 so it will be disconnected from the normal signal path and available for my own circuitry.
However, I discovered that pin 12 was bent back underneath the IC and not sitting in the socket. Is it like this on all Dragons? The schematics don't indicate pin 12 at all so I guess it is floating by design, but I found it a bit particular to be bent out of the socket like this. Maybe to keep it short to avoid picking up too much noise, without the added effort of cutting it off?
This is a Dragon 32, main board MKII issue 5 ("Siemens").
However, I discovered that pin 12 was bent back underneath the IC and not sitting in the socket. Is it like this on all Dragons? The schematics don't indicate pin 12 at all so I guess it is floating by design, but I found it a bit particular to be bent out of the socket like this. Maybe to keep it short to avoid picking up too much noise, without the added effort of cutting it off?
This is a Dragon 32, main board MKII issue 5 ("Siemens").