Re: ECHO+ Card

["Eric" <lonewolf@hotmail.com>]

> While it has the same sound generators as the Mockingboard, they
> are both controlled by one 6522 (while the Mockingoard uses two),
> so it is not compatible with the Mockingboard at the hardware level.
>
> FWIW, it surprised me when I saw that the Mockingboard used two
> 6522s to control two 8910s.  Each 6522 has two 8-bit ports, and one
> would have sufficed.  (Of course, another would have been required to
> add speech, then.)  It seems that the Mockingboard was simply a
> "doubled" mono design.  The early models even brought the "extra"
> 8-bit parallel port of the 6522 out to a header on the card.
>

Is that the reason you only get to listen to 1 side of the speaker (left OR
right speaker, without using any mono-to-stereo adaptor) when there's only 1
sound generator/speech chip installed on the Mockingboard?

Speaking about speech chip, where in the world can I find a SSI-263 speech
chip?

Eric