[comp.sys.mac] milliseconds & NCR 5380

baron@runx.OZ (Jason Haines) (11/18/86)

Does anyone have any ideas/source on implementing a millsecond timer for the
Mac?

Also, does anyone have any info about the NCR 5380 chip used for SCSI on Macs?

Thanks in advance,
		Jason Haines

lsr@apple.UUCP (11/22/86)

In article <302@runx.OZ> baron@runx.OZ (Jason Haines) writes:
>
>Does anyone have any ideas/source on implementing a millsecond timer for the
>Mac?
>

You can get millisecond interrupts using the timers in the VIA.  On 128K
ROMs there is a Time Manager that provides this service in a way that will
work with future machines.

If you want to work with old ROM machines you can access the VIA timers
directly.  Inside Macintosh volume III has more information.



-- 
Larry Rosenstein

Object Specialist
Apple Computer

AppleLink: Rosenstein1
UUCP:  {sun, voder, nsc, mtxinu, dual}!apple!lsr
CSNET: lsr@Apple.CSNET

dwb@well.UUCP (11/22/86)

For information on millisecond timers check the Time Manager
section of Inside Mac Volume IV.

Contact your local NCR part's house for information on the 5380,
it's a standardpart.



-- 
	David W. Berry
	dwb@well.uucp                   dwb@Delphi
	dwb@GEnie                       293-0752@408.MaBell