Xref: utzoo comp.sys.amiga.tech:106 comp.sys.amiga:16603
Path: utzoo!mnetor!uunet!husc6!m2c!ulowell!page
From: page@swan.ulowell.edu (Bob Page)
Newsgroups: comp.sys.amiga.tech,comp.sys.amiga
Subject: PAL and Audio
Message-ID: <5679@swan.ulowell.edu>
Date: 24 Mar 88 17:16:58 GMT
Reply-To: page@swan.ulowell.edu (Bob Page)
Organization: University of Lowell, Computer Science Dept.
Lines: 17

I just saw the "Pal [sic] and Audio" article in AmigaMail (a support
publication from CBM, contact CATS for info).  The article states you
should look at GfxBase->DisplayFlags to find out if you're running on
a PAL or NTSC machine, for determining clock rates (to accuarately
generate audio frequencies and periods).

Why not use SysBase->VBlankFrequency instead?  Wouldn't it be more
accurate?

 PAL    3.546895                 50Hz
 ---- = -------- = 0.990878      ---- = 0.833333
 NTSC   3.579545                 60Hz

..Bob
-- 
Bob Page, U of Lowell CS Dept.  page@swan.ulowell.edu  ulowell!page
		"Nicaragua" is Spanish for "Vietnam."