[Coco] Using the Sound/Speech Cart

[Kevin Diggs]

Diego Barizo wrote:
> All I get is a nice silence...
> Any clues about what I'm doing wrong?
> 
> Diego
> 

	Did you remember to set the sound mux (controlled off of one of the 
PIAs) to select cartridge sound? Look at bit 3 of PIA 1's control 
registers. Also take a look at bit 3 of PIA 2's port B control register 
(FF23), the six bit sound enable.

					kevin

	On an unrelated note, the map type is set from one of the sam flags:

	access of FFDE selects 32K RAM/ROM
	access of FFDF selects 64K RAM

	There was also mention made of BASIC 1.0 and 64K chips. There are some 
flags that have to be set on the SAM to select the RAM chip type, 
presumably for refresh:

	FFDA FFDB	M0
	FFDC FFDD	M1

	M1 M0
	 0  0	4K
	 0  1	16K
	 1  0	64K

	Anyone know what bit 2 of PIA 2 port B is used for?