Just thought I'd put a quick update here, managed to crack it in the end...
Code:
ScopeInitFreq lea FreqTable+(scopebytewd*8*2),a0
moveq #1,d0 ; current period
.nextperiod move.l #35469/(scopebytewd*8),d6 ; the magic number!
moveq #0,d5
move.w #scopebytewd*8-1,d7
moveq #0,d2
moveq #0,d3
.test add.l d6,d5
move.l d5,d1
divu d0,d1
move.w d1,d2
sub.w d3,d1
move.w d1,(a0)+ ; store byte move size
move.w d2,d3
dbra d7,.test
add.w #1,d0
cmp.w #scopemaxperiod,d0
blo.b .nextperiod
RTS
Simply re-do the calculation incrementing the seed each time. Also managed to get this plugged into the scope drawing routine. You can see it re-sizing the wave depending on the frequency of the sample !
