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- Path: sparky!uunet!gatech!purdue!mentor.cc.purdue.edu!sage.cc.purdue.edu!ericm
- From: ericm@sage.cc.purdue.edu (Eric Mulholland)
- Newsgroups: comp.sys.apple2
- Subject: Re: system software idea
- Message-ID: <57022@mentor.cc.purdue.edu>
- Date: 17 Aug 92 12:13:16 GMT
- References: <9208130436.aa12107@generic.UUCP> <1992Aug13.143119.43@wsuhub.uc.twsu.edu> <17AUG199202353012@vax2.concordia.ca>
- Sender: news@mentor.cc.purdue.edu
- Organization: Purdue University Computing Center
- Lines: 32
-
- spector@vax2.concordia.ca (Mitchell Spector) writes:
- > Is there a program which lets you change that vaule in battery RAM? As I
- >mentioned before, my ROM 3 has both CDAs locked in with no apparent way to
-
- By using the built-in monitor you can change the battery ram, see below.
-
- >disable them. I've tried purging my BRAM settings by setting the system to
- >50Hz or 60Hz (CTRL-OPTION-RESET, 2 or 3), but they're still in the menu! :-(
-
- Hummm, I never tried it on my rom 3 to verify if it still works.
-
- >ROM 3 CPUs (CDAs locked in menu permanetly), but I'm wondering if maybe it has
- >something to do with this special battery RAM setting.
-
- BRAM information:
- To read BRAM to memory 00/1000. (from monitor)
- \4 0 0 0 10 0 A 3\U
- To write BRAM from memory 00/1000. (from monitor)
- \4 0 0 0 10 0 9 3\U
- To enable ROM CDAs at boot. (rom 3 only)
- Set bit 7 (high biit) of BRAM postion $59.
- To disable scanline interupts on pointer updates. (mouse arrow fix)
- Set bit 2 of BRAM postion $5F.
-
- There is another location that tells System 6 not to display icons at the
- bottom of the screen during boot up. I didn't save the information when
- Dave L. posted it a long while back (I like icons).
- --
- ____
- Y_,_|[]| Eric Mulholland
- {|_|_|__| ericm@sage.cc.purdue.edu
- //oo--OO ...!pur-ee!sage.cc!ericm
-