[sdiy] Xpander

[Tom Wiltshire]

The Prophet T8 worked the same way, with the main processor writing to a common RAM area shared with the voice (“final”) processor.

Given the speed of serial comms at the time, it makes a lot of sense. In many ways it *still* makes a lot of sense.

Tom

==================
       Electric Druid
Synth & Stompbox DIY
==================



> On 18 Oct 2020, at 11:12, Michael Zacherl <sdiy-mz01 at blauwurf.info> wrote:
> 
> 
> 
>> On 18.10.2020, at 05:09, Brian Willoughby <brianw at audiobanshee.com> wrote:
> 
>> I believe that the main CPU writes directly into the memory space of the voice CPU. i.e. there are no "MIDI" messages exchanged with the voice boards, but direct memory modification. 
> 
> I think I read, the main cpu issues a halt-request to the voice board, which causes the voice cpu to set its bus-lines into high-Z mode, IIRC.
> Which would fit the picture you describe. 
> m.
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at synth-diy.org
> http://synth-diy.org/mailman/listinfo/synth-diy