Analogue-sequencer

> well that clears things up; 'RAM TEST FAIL!'/'check RAM U3'/'check 
> RAM U2'
> 
> so i guess this means both RAM ic's are fried?
> because i could run out and quickly get some new ones for 3 euro's 
> each..
> are these the right type? "Ram 32Kx8 Static HM62256-100nS DIL-28"

That sounds like the right sort - nearly any CMOS 62256 type should do.

> or have i wired something incorrectly? i've doublechecked every 
> connection & solderpoint on the mainboard... 

Hmm. It does seem unlikely that both RAMs would be fried, but not
impossible.
Have you checked the orientation of the 74HC573 address latch ?
And you haven't got it mixed up with one of the 74HC574 ? (not implying
you're daft - I've made that mistake before myself !)

If you have a scope, you could check the activity on the address bus
lines to confirm the address latch is operating, and check the CS, OE
and WR lines on the RAMs.

Colin f