At 3:38 Uhr +0200 28.07.1997, nigel@ind.tansu.com.au wrote:

>* I discovered that one Booter "environment variable" was different;
>  TIMEDBRA = 5217 (0x1461)	with Booter 1.9.4,
>  TIMEDBRA = 5221 (ox1465)	with Booter 1.9.5.

TIMEDBRA is the number of times that the processor runs a

loop:	dbra	d0,loop

per second. As an indicator of CPU speed it is mainly used for short
delays. You are talking about a 1000 ppm difference - not really a big
deal. ;)

>Looking through the code, this value is set differently by the
>two compilers. MetroWerks calls a function LMGetTimeDBRA(), while Symantec
>dereferences a Low Memory address constant.

Apple's Universal Headers wrap accesses to low memory globals into inline
functions to be more portable; lomem globals are said to go away,
eventually.

>I am searching through some of
>the MacOs developer sites now, looking for an explaination of the
>LMGetTimeDBRA() routine.

No need to. Look for <LowMem.h> in "Universal Headers".

>	I am at a loss to explain why this would _only_ affect booting on
>the IIvx models, but assuming that this is the problem, we may have a new
>Booter ready this weekend for testing.

Seems to me you're somewhat on the wrong track?

	hauke


--
"It's never straight up and down"     (DEVO)