apratt@atari.UUCP (07/12/88)
In article <8807021540.AA22916@ucbvax.Berkeley.EDU>, wawers@DMZRZU71.BITNET writes: >Question : How do you prevent the auto folder programs > from beeing executed ? > > OR > > How do you make your ST execute the floppy disk auto > folder instead of the hard disk auto folder ? > > Theo If you don't have a bootable hard disk, do this: Put a disk in Drive A which DOESN'T have ahdi.prg in the auto folder. Do a cold boot. To get a cold boot, you have to turn off the power for ~10 sec (longer on a Mega), then turn it back on. Alternatively, you can assemble and run the program below. Now find a disk with AHDI on it (the one that comes with your hard disk will do) and double-click AHDI from the desktop. You have to install Drive C manually on the desktop (see your owner's manual). ************************************************************ If you have a bootable hard disk, do this: Do a cold boot (see above). After you turn on the power, your drive A light will come on (perhaps 1 sec or more from the time you turn on the power). Hit the Alternate key now, and hold it down. Your drive A light will go out, then come back on, and the hard disk won't boot. ************************************************************ CUT HERE FOR PROGRAM COLDBOOT.S ************************************************************************* * * * COLD cold boot code: copy a bit of code to $8, then jump to it. * * The bit of code clears RAM starting from its own end, until it * * gets a bus error. Then it jumps to the start of the ROM. * * * * This will obliterate any eternal RAM disks, caches, auto-booting * * hard disks, etc., and give you the coldest boot you can get without * * turning off the power. Colder, on a Mega, because the RAM holds * * its contents for >10sec sometimes. * * * ************************************************************************* coldboot: ; get Supervisor mode. clr.l -(sp) move.w #$20,-(sp) trap #1 move.w #$2700,sr ; disable all interrupts lea.l cstart(PC),a0 ; move my code to address 8 move.w #$f,d0 ; move 64 bytes (should be enough) move.l #$8,a1 rloop: move.l (a0)+,(a1)+ dbra d0,rloop jmp $8 ; jump to my routine. * this routine is position-independent, and gets executed * at absolute address 8. cstart: lea.l berr(PC),a0 ; a0 -> my bus-error handler move.l a0,$8 ; set bus-error vector lea.l cend(PC),a0 ; start clearing from my end moveq.l #0,d0 ; clear a bunch of registers move.l d0,d1 move.l d0,d2 move.l d0,d3 move.l d0,d4 move.l d0,d5 move.l d0,d6 move.l d0,d7 * loop forever (until bus error) cloop: movem.l d0-d7,(a0) add.w #(4*8),a0 bra cloop * * my bus error handler: load reset PC value from absolute address 4 * and jump there. * berr: move.l $4,a0 jmp (a0) cend: dc.w 0 .end ============================================ Opinions expressed above do not necessarily -- Allan Pratt, Atari Corp. reflect those of Atari Corp. or anyone else. ...ames!atari!apratt
klute%trillian.irb@unido.uucp (Rainer Klute) (07/19/88)
In article <1094@atari.UUCP> apratt@atari.UUCP (Allan Pratt) writes: >************************************************************************* >* * >* COLD cold boot code: copy a bit of code to $8, then jump to it. * >* The bit of code clears RAM starting from its own end, until it * >* gets a bus error. Then it jumps to the start of the ROM. * >* * >* This will obliterate any eternal RAM disks, caches, auto-booting * >* hard disks, etc., and give you the coldest boot you can get without * >* turning off the power. Colder, on a Mega, because the RAM holds * >* its contents for >10sec sometimes. * >* * >************************************************************************* Why not simply set memvalid (0x0420) to zero and jump through 0x0004? +---------------------------+------------------------------------------+ | Rainer Klute | UUCP: klute@unido.uucp | | University of Dortmund | (...uunet!mcvax!unido!klute) | | Dept. of CS | BITNET: klute@unido.bitnet | | P.O. Box 500500 | | | D-4600 Dortmund 50 | | +---------------------------+------------------------------------------+ | Federal Republic of Germany | +----------------------------------------------------------------------+
braner@batcomputer.tn.cornell.edu (braner) (07/21/88)
[] In article <489@laura.UUCP> klute%trillian.irb@unido.UUCP (Rainer Klute) writes: >In article <1094@atari.UUCP> apratt@atari.UUCP (Allan Pratt) writes: >>* COLD cold boot code: copy a bit of code to $8, then jump to it. [...] >Why not simply set memvalid (0x0420) to zero and jump through 0x0004? - the latter is (part of) what my "COLDBOOT" program, posted a while ago, does. Since it is VERY short, here's a repost. - Moshe Braner -------------------- A utility was posted a while ago to make the RESET button do a COLD reset. I don't like that (since I want to keep the reset-proof RAMdisk) but occasionally I do need a cold boot. Since HDB2.3 apparently does not boot right if I leave the HD on and turn the ST off and on, I wrote the following little ditty. It asks for confirmation, then does a cold reset (that redoes the memory size check, although it keeps the time...). ------------ cut here ------------ begin 644 coldboot.tos M8!H !\ $AY 1#\\ E.05R//SP a M 4Y!5(\, !Y9PH, !99P1"9TY!0J<_/ @3D%<CT*Y $($*Y $)B!Ya M !$[0#0H*"0=$;R!Y;W4@<F5A;&QY('=A;G0@=&\-"@D@9&\@82!#3TQ$a 6(')E<V5T/R H>2]N*2 ' " a a end
bammi@dsrgsun.ces.cwru.edu (Jwahar R. Bammi) (07/21/88)
Just FYI:
New (yet unposted) versions of Gulam have a reboot command.
# reboot does a warm reboot
# rebbot -c does a cold reboot
both commands save history if `history' is set before rebooting.
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compuServe: 71515,155ge@hobbit.sci.kun.nl (Ge' Weijers) (07/26/88)
From article <489@laura.UUCP>, by klute%trillian.irb@unido.uucp (Rainer Klute): > In article <1094@atari.UUCP> apratt@atari.UUCP (Allan Pratt) writes: >>* COLD cold boot code: copy a bit of code to $8, then jump to it. * >>* The bit of code clears RAM starting from its own end, until it * >>* gets a bus error. Then it jumps to the start of the ROM. * > > Why not simply set memvalid (0x0420) to zero and jump through 0x0004? > A virus conceivably might restore memvalid directly after the reset (or can it? I'd have to check it with a disassembler) -- Ge' Weijers, Informatics dept., Nijmegen University, the Netherlands UUCP: {uunet!,}mcvax!kunivv1!hobbit!ge