A500IDE V1.5
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DISCLAIMER: I disclaim everything. You use this at your own risk.


These are instructions for building a simple non-autobooting 
IDE-harddisk (and ATAPI CDROM with new software) interface for
Amiga 500 direct bus connection. It might work with other Amigas.

This is only a hack, and even if it seems to work it may work unreliably.
Many people have made this hack and it has worked faultlessly for some of
them. But for some people it has not worked.

I have tested the A500 bus interface on KS1.3 and KS2.05(ROM 37.300) 
systems. Drives tested include eg. Conner Peripherals CP3044,
Western Digital Tidbit 60 (2.5") and Seagate ST3850 (811 MByte drive). 
and others. Speeds were about 400 KBytes/second, and even 600 KBytes/s.
Prairietek 120 20MB 2.5" drive did not work(gave errors.) 

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There is a device driver ide.device and its sources included. This
ide.device supports only one drive. It won't work with drives over 4 GBytes.
You can find a built binary in the "devs" directory.

There is also new software by Radovan Kobularcik.
That driver supports two drives per interface
and also ATAPI CD-ROM drives. (However there are propably no CD-filesystems
for OS 1.3) The driver supports HDToolBox for partitioning, and
there is also a mounting program that uses partition information
on the Rigid Disk Block that is written by HDToolBox.
The software is in "rkide.lha". There are a few bugs:
It may hang if there is no drive connected.
For KS1.3 the line "filesystem = L:FastFileSystem" is not generated
by the mounting software to the mountlist in RAM:.


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Building the interface:
The (simple) direct Amiga 500 bus connection versions:
1.
schem.iff is the one with two chips. Parts are: 74HCT688 and 74ALS00.
You can substitute with 74ALS688, 74LS688, etc.. and 74F00.
The IDE-cable must be short to minimize transfer errors.
(ringing, crosstalk etc.) Use wire links or a 8 pole DIP switch
to determine the base address. When a switch is on, the bit is 0.
The P/Q pairs of the ´688 comparator do not necessarily have to
be in the same order. In fact, the schema and PCB differ in this way.
There is (in postscript files, bottom layer and component placing)
a circuit board design using these two chips. You will need
a high resolution postscript laser printer to print it.

2.
palide.pld is a logic equations file for PAL16L8 or similar device in
Sprint programmer format. Edit it to give the base address wanted.
This chip replaces the other chips in version 1. Otherwise follow the
schem.iff connections.

After changing the base address you must remember to change it in
the software as well.

The Amiga 500 and ATID connectors can be found from iff-file
Connector.pic (c) P. Pihkala
and the ATA(=ATID/IDE) connector from text file atacon.txt.

To test the interface and find out interesting drive parameters use
the program IdentifyDrive (it's in the software directory)

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MOUNTING is needed as the interface does not autoconfig(tm)urate
and the drive doesn't automount.

An example mountlist is in ide.ml. Edit it to give partitions.

The ide.device needs to be in the devs: directory.

If you want FastFileSystem:
If the Kickstart is 1.3, there must be L:FastFileSystem.
With KS2.0 don't use the FileSystem = L:fastfilesystem line
in the mountlist.

An example command for introducing a partition to the system:
Mount fre: from ide.ml

A useful file for a boot floppy: startup.seq 
Copy it to s/startup-sequence of the boot floppy after copying
system files to the partition on the HD. It will re assign
assign:s to that partition so it becomes the sys: partition.
It will also start s/startup-sequence on the new sys: partition.
You will also need devs:ide.device, mount command and a mountlist file
on the boot floppy.

You can format the partitions with AmigaDOS Format command.

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See software/READ.ME for descriptions about the files in that
directory.

I am the author of (this) rdwt.asm and some of the other files.
Check out Aminet hard/drivr directory for new software(sometime maybe).
This hack is partially based on "Atid.lha" by P. Pihkala
and SPARTAN SCSI driver sources by Paul Harker. 
Spartan is on Aminet hard/hack and hard/drivr.

My e-mail address is: mika.leinonen@cc.tut.fi
Web-page(standard drafts here):www.students.tut.fi/%7Eleinone3/ide.html

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Version history:
V1.5 March 2001
     Added a place for an activity LED to PCB. Included new software.
V1.4 November 2000
     Fixed a bug in the PCB, /IOW and /IOR were on wrong IDE-con. pins.
V1.3 August 2000
     Removed "plide", a circuit with a PAL16L8 and 74LS245 buffers. 
     One chip(74LS04) less in the "ttl-version". 
     New PCB design for it.
V1.2 Fixed bug that caused for example Seagate drives not to work.
V1.1 November 1997: Not released for distribution.
     automatic drive identification, 
     New interface pcb and schematic "plide".
V1.00002 September 1997: first version released for distribution
     Edited schematic, none very important changes.
V1.00001 February 1997  : some editing done
V1.0 1996