Analogue-sequencer

- swapped the 74hc573; no change, same 'ram test fail' message.
- swapped both the 74hc138's; no change, same 'ram test fail' message.

so now i'm going to wait until the 62256's are in tomorrow.

and..i've noticed what i think is a bug in the 3.73 firmware; when i 
try to get to the boot/flash screen by holding down func+page during 
power-up, it ignores the command and continues booting...