#NTSC/PAL Jumper?
15-Nov-89 00:20:54
Sb: #74291-#NTSC/PAL Jumper?
Fm: Don Curtis/SYSOP 76703,4321
To: JEFFREY C. DEGE 76426,211
A quote from Dave Haynie (the designer of the A2000):
J102 controls whether the 1 Meg Agnus powers up in NTSC or PAL
mode. If the jumper is closed (as shipped) you get NTSC, if open PAL. The
old style Agnus used this pin for some test function and we required
separate chips for PAL and NTSC.
In other words…it has nothing to do with the rev of the
motherboard. I also seem to recall that the Amiga autosenses 50Hz or 60Hz
power lines and based on that sets NTSC or PAL mode (I could be wrong on
that though).