Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!uxc.cso.uiuc.edu!uxc.cso.uiuc.edu!ux1.cso.uiuc.edu!uxa.cso.uiuc.edu!krb20699
From: krb20699@uxa.cso.uiuc.edu
Newsgroups: comp.sys.apple
Subject: ProDOS block 0
Message-ID: <113300095@uxa.cso.uiuc.edu>
Date: 4 Aug 89 07:17:00 GMT
Lines: 37
Nf-ID: #N:uxa.cso.uiuc.edu:113300095:000:2062
Nf-From: uxa.cso.uiuc.edu!krb20699    Aug  4 02:17:00 1989


     I have a lot of software on 5.25" disks from my IIe that I use a lot on
my IIgs (fast!)  When I got my machine, I set the bootup slot to 6, and booted
up my old software nicely.  When there wasn't a disk in the drive, it would boot
up slot 5 (my 3.5" drive) automagically, after rattling the 5.25" drive.
     Later, I heard from someone on a local BBS that their machine did NOT poll
to slot 5 after finding an invalid/nonexistent disk in slot 6.  Could this be
a difference between the gs ROMsets (00/01) or something else?
     For this person, I decided to write some code to block 0 of a ProDOS disk
that would boot up slot 5 without having to change the Control Panel setting
from a slot 6 bootup to slot 5. I tried the following assembly at byte 0 of
block 0:

 LDA #05
 STA E102E8
 JMP FAA6

     On my gs with the boot slot set on 6, it completely ignores the code,
and automatically polls slot 5 as usual.  I've tried assigning $E1/02E8 values
from slot 6 to slot 3 to slot 255, and there was no change.  Is there something
I'm missing about the info in block 0, or is my machine warped?  (Unfortunately,
NOT TransWarped...}=
     I'd like some info on block 0 if anyone is willing.
     By the way, what is the physical location of the apple.com unix machine?
It's really fast here from the University of Illinois' UXA machine.  Sometimes
apple.com FTPs faster than our machine can push around data DIRECTLY!  {=
     Thanks a lot, in advance.


InterNet:        krb20699@uxa.cso.uiuc.edu        |    Ken Brownfield
PLATO:           ken brownfield/unialum/cerl      |    RR#4 Box 152
NovaNET, CERL:   brownfield/dialup                |    Champaign, IL, 61820.
AppleLinkPE:     ASA(I-can-afford-it)             |    1-217-643-7504
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I'm 16 years old, a Sophomore Computer Engineer at the University of Illinois,
  and proud of it.  "The company I work for didn't give me this signon, so
everything I say above is legal, if not correct, right, authorized, or poetic."