OBERHEIM SYNTH

I haven't been following this thread but when I was an assembly 
programmer (back in the day) ANDA#$80 would zero out all bits other than 
bit 7.

i.e. binary XYZA BCDE => X000 00000

In C that would be "a = a & 128"

Cheers,
A.


On 2014-09-10 15:56, charlie midi gfa charles.copp@... 
[oberheim] wrote:
> from what i know this will strip the high bits off
>  leaving only values 127 or less
>
>  its been a while
>
>  > I'm not really that far into the disassembly yet, but what I find 
> at that
>  > point of the code is this:
>  >
>  > ANDA #$80 *C693: 84 80 '..'
>  >
>  > So, no adding, rather an AND, so the patch value would rather have 
> to be
>  > 0x7F - or am I wrong there?