Enhanced Apple Sound Chip (EASC)

[Felix Deichmann <m4j0rd0m0%gmail.com@localhost>]

Hi,

the speaker of my Quadra 700, attached as asc(4) [1], produces strange
clicks/creak instead of beeps/bell. This is also reported by [2].

According to [3], many Quadras and PowerBooks have the Enhanced Apple
Sound Chip (EASC) instead, which "does not support wavetable mode" [4]
used by asc(4).

Register layout of ASC and EASC looks similar, and offset 0x800
"Version", present for both, will report 0xb0 for EASC [4].

So would it be OK to prevent the asc(4) match in case of an actual EASC,
for now?

Felix

[1] http://dmesgd.nycbug.org/index.cgi?do=view&id=3353
[2] http://www.netbsd.org/ports/mac68k/faq/faq-6.html#ss6.7
[3] http://www.mess.org/mess/driver_info/mac_technical_notes
[4] http://www.mess.org/mess/driver_info/easc