Hi Paul,

Did you find this link?

http://www.manualscenter.com/advanced_search_result.php?
keywords=TX802&osCsid=ef3b0e6d6209f35afa6ea613aac6a991

These guys have the service manual for the TX802 but I'm not sure
what rev... It's $14.95 with and you can pay with Paypal or Visa/MC.

It's really great you're filling in the holes for the different revs.
This is way more info than any one site I've stumbled across. I
someday would like to find a TX802 to replace my TX7 so it would
follow my DX7IID even though the performances are not compatible.
It's really strange why Yamaha didn't make these totally compatible.
I have a blast with my SY/TG55 setup. I even use the odd/even note
scheme to max the poly.

Keep on seaching till we reach the end of the web?????

Fran

--- In yamahablackboxes@yahoogroups.com, "paul.deco" <paul.deco@...>
wrote:
>
> --- In yamahablackboxes@yahoogroups.com, "paul.deco" <paul.deco@>
> wrote:
>
> V1.0 ? ? ?
> V1.1 25-JUN-87
> V1.2 ? ? ?
> V1.3 27-OCT-87
> V1.4 25-MAR-88
> V1.5 ? ? ? last version
> >
> > If you own a TX802:
> > *Press the[8]and[9]buttons,while holding,press[POWER]on*
> > The display shows:
> > *V1.4 25-MAR-88*
> > Turn[POWER]off
> >
> > If your TX802 has another OS Version,please reply.
> > Someone knows the differences between the Versions?
> > Is there a way to update the OS?
> >
> > Paul
> >
>