18 Jun
2009
18 Jun
'09
11:05 a.m.
I know we went through all of this several months ago
("Do the Commodores
really need the 9VAC?"), but my 128D has an AT power supply in it,
therefore is not feeding the system with 9VAC, and is functioning
perfectly well.
IIRC the 9V AC is fed to the expansion connector and used by some
add-ons, and is also used by the cassette motor circuit. And not a lot
else. The machine may well work without it, but I don't think you'll be
able to use cassettes.
I've even pulled the PSU out of a 1571 and use an external Molex from the
AT PSU in 128D to power the 1571. In my mind I say it is more efficient.
No empirical proof of this, however. :)
IIRC, the regualtor for the 5V rail (inside the original Commodore PSU)
is a switcher, running off the output of a mains-frequency transformer.
It's more efficient than a linear regulator.
The Amiga zupply that looks similar (A500, etc) is a normal mains-input
SMPSU thing.
-tony