sammichSID screen unresponsive

[x0xb0x]

hey friends...

just recently finished building my sammichSID and for the most part everything works, the firmware and patch transfers worked and the thing makes sounds ! :)

I have occasionally experienced the display freeze up yet the synth still still works and I can switch patches but the screen doesn't follow.

I've also had a few re-boots (power-cycles) where the sammich doesn't get to the main screen - after a few attempts it sometimes will get there.

I'm imagining this is either power supply related or MIDI-related? It seemed to happen most recently when I got deeper into the menus.

I'm using a regulated 12V/1A PS with the high-power green LCD and 6582 SID's. (PHC SW-121AR switching power supply)

Any advice appreciated; will continue to update this thread if I can find more cause-effect situations.

In the meantime should I order the PS recommended from Jameco? Other thoughts?

[Hawkeye]

Hi,

can you measure voltages, when the unit is turned on? To me, it sounds like a power problem, too!

I experienced similar behaviour, when adding a very power-hungry VFD to the MB6582, then still with a standard C64-PSU. The VFD caused the 5V "logic" supply voltage to drop to around 4.6V - screen updates were very slow back then and I had the feeling, that the PIC was slowing down or the display could not keep up with the data feed...

Many greets,

Peter

Edited November 17, 2012 by Hawkeye