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1978-11-24
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This file describes the steps neccessary to access a JanusTools hard disk
partition using CrossDos. You may also be able to use other MS-DOS file
systems, such as MessyFileSystem.
1. Set up the partition you wish to use with the Bridgeboard or PC-Task
on your Amiga hard drive according to the JanusTools documentation
*except* you must set the DOSType for the new partition to 0x4D534400
*not* 0x4D534800 as stated in the JanusTools documentation. CrossDos
will not work with the 0x4D534800 DOSType, but JanusTools will work with
the 0x4D534400 DOSType. This should be possible to do with HDTools
or the utilities that came with your Amiga hard drive.
2. Obtain PCDISK91B (from Aminet). In it is a utility called DISKINFO.
Run DISKINFO to obtain the Mountlist parameters for the JanusTools
drive. It is best to redirect this to a file so that it can be imported
into your Mountlist. I use something like: DISKINFO DH2: >DH2.PARMS.
3. Add this entry (DH2.PARMS in my case) to the end of your Mountlist.
The Mountlist usually resides in SYS:DEVS/Mountlist (where SYS: is the
boot partition and usually a hard drive, but could be a floppy).
4. Modify 5 of the parameters in the Mountlist entry that you just added for
the JanusTools partition. Change the name of the entry. If it is DHx:,
you can change it to something like IBMC:, IBMD:, or whatever.
Change the DosType parameter to 0x4D534400 (but, it should already be set).
Now the entries for LowCyl and HighCyl should be modified according to
the formulas (taken from PCDISK91B):
NewPCLowCyl = (AmigaLowCyl * Surfaces) + 1
NewHighCyl = (AmigaHighCyl + 1) * Surfaces) - 1
where AmigaLowCyl is the LowCyl parameter of the unmodified Mountlist entry
AmigaHighCyl is the HighCyl parmater of the unmodified Mountlist entry
Surfaces is the Surfaces parameter of the unmodified Mountlist entry
Replace LowCyl and HighCyl with these values and replace Surfaces with 1.
5. Add a parameter entry (or change any existing one for FileSystem):
FileSystem = L:CrossDosFileSystem (or L:MessyFileSystem)
6. If you plan to use this partition with any of the various Bridgeboards,
you will need to edit the ABOOT.CTRL file which is usually in the PC/SYSTEM
drawer. Put in this file the name of your PC partition (i.e IBMC:, IBMD:
etc.) Be sure you have the ":", but do not put a carraige return (newline)
at the end. Thus, you should have one line only in the file.
7. Now, when you boot your Bridgeboard, you will have to go through the usual
steps to initialize and format the new partition. Please see you MS-DOS
documentation if you are not familiar with this.
8. If you have done everything correctly, you can now Mount this entry (add
a statement in your startup-sequence such as MOUNT IBMC:) prior to
invoking the Binddrivers command to boot the Bridgeboard and when you
do a DIR on it from AmigaDOS, you should see the PC files. You should
also be able to add this entry as a primary (C:) or secondary (D:) hard
disk entry in the PC-Task startup menu and access it when in PC-Task.
If you have problems or are reading garbage, go back and carefully
check the parameters.
As an example, I have an IBM 728 MB IDE drive partitioned into
DH0: (200 MB), DH1: (200 MB), DH2: (200 MB) and DH3: (99 MB). I used
DH2: as my PC DOS partition.
My DH2 entry (from DISKINFO) looks like this:
DH2: Device = ExpSys.device
Unit = 80
BlockSize = 512
Surfaces = 16
BlocksPerTrack = 63
Reserved = 2
PreAlloc = 0
Interleave = 0
LowCyl = 818
HighCyl = 1224
Buffers = 32
BufMemType = 1
MaxTransfer = 0x7FFFFFFF
Mask = 0x00FFFFFE
BootPri = 0
DosType = 0x444F5301
#
My JanusTools PCE entry (modified from DISKINFO) looks like this:
PCE: Device = ExpSys.device ;<- changed
FileSystem = L:CrossDosFileSystem ;<- added
Unit = 80
BlockSize = 512
Surfaces = 1 ; <- changed
BlocksPerTrack = 63
Reserved = 2
PreAlloc = 0
Interleave = 0
LowCyl = 13089 ; <- changed
HighCyl = 19599 ; <- changed
Buffers = 32
BufMemType = 1
MaxTransfer = 0x7FFFFFFF
Mask = 0x00FFFFFE
BootPri = 0
DosType = 0x4D534400 ; <- changed
#
My ABOOT.CTRL has PCE: and I can access PCE: from the Bridgeboard, if I
disable my PC IDE drive via the CMOS settings, or I can access it from
PC-Task, or I can access it via AmigaDOS (CrossDOS).
Jordan Krim
krim@vnet.ibm.com
krim@azstarnet.com