Re: Magic Voice Schematics

From: Richard Atkinson (
Date: 2005-04-13 02:09:02

On Wed, 13 Apr 2005, [ISO-8859-2] Grósz Attila wrote:

> $FD20 is the speech command register on the C364 :-) So you indeed
> had to ask him (her? ;-) ) twice.
> I wonder if the MV has this too?
A similar thing happens in the Magic Voice ROM a lot. $DF81 is 6525 Port
Register B, and it is frequently loaded with 4 bits in D0-D3 for the
T6721A, with D4 low (PB4 is connected to T6721A WR#), then there is an ORA
#$10 command and then the register is loaded again.

This generates a positive edge on the T6721A WR# line for the chip to read
in the data.


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