Re: How to boot 16k prog

[Jeff.Brielmaier@juge.com (Jeff Brielmaier)]

mH>>From: mark.REMOVE.percival@videotron.ca (Mark Percival)
mH>>Subject: Re: How to boot 16k program?
mH>
mH>On 25 Sep 1999 00:54:36 -0400, dalloff@gcfn.org (Dave Althoff) wrote:
mH>
mH>>How about this...boot with a DOS 3.3 System Master, which will load
mH>>INTBASIC into the Language Card and write protect the card.  I think that
mH>>if you then go into Integer BASIC--
mH>>
mH>>]INT
mH>>>CALL-151
mH>>*C600G
mH>>
mH>>...you activate the Integer BASIC "ROM".  Not really ROM, but it might be
mH>>close enough.
mH>
mH>I've never had any luck with this.  Try the following:
mH>
mH>1) Initialize a AppleDOS 3.3 disk with an Integer Basic HELLO program.
mH>2) Boot your AppleDOS 3.3 System Master and let Integer Basic load.
mH>3) Go into Integer Basic (]INT).
mH>4) Enter the monitor (>CALL-151)
mH>5) Now try booting the disk you created in step 1 (C600G)
mH>
mH>You will always get LANGUAGE NOT AVAILABLE on boot.
mH>
mH>What does work (and I don't know why) is the following.
mH>
mH>1) Initialize a AppleDOS 3.2 disk with an Integer Basic HELLO program.
mH>2) Boot your AppleDOS 3.3 System Master and let Integer Basic load.
mH>3) Go into Integer Basic.
mH>4) BRUN BOOT13
mH>5) Now try booting the disk you created in step 1.
mH>
mH>For some reason BOOT13 does maintain the Integer ROMS.  Perhaps this
mH>is enough to get the original diskette to run?

The reason for this is that DOS 3.3 includes a "patch" at $BFC8 (called
from $B741) which puts a $00 at $E000 in the Language card.  By zero'ing
$E000, the language detect routine fails to detect Integer BASIC.

The reason that DOS 3.3 included the $E000 patch was due to the fact that 
some programs used the "Language Card" region for their own purposes 
without overwriting $E000.  This caused DOS to incorrectly assuming the 
Integer BASIC was loaded.  This caused the machine to crash when it 
attempted to execute code in the overwritten area.

 * KingQWK 1.05 # [PK] * Apple Computer Inc.  Makes No Apple Computers.