WarpDrive 040/SCSI Help

[ckillerh3]

Amiga Addicts -

Does anybody have tech information on the WarpDrive 040 Zorro III accelerator/process card for Amiga 4000 systems?  I'm trying to configure the SCSI to connect up with a JAZ drive but I need to know the << Max Buffers>>> data transfer rate information the card will function properly.  HD tools does not grab this info for me from the drive since it is card specific I think.


Thanks !

[Thomas]

I'm trying to configure the SCSI to connect up with a JAZ drive but I need to know the << Max Buffers>>> data transfer rate information the card will function properly.

There is no "Max Buffers" parameter. There is "Buffers", "Max Transfer" and "Mask".

Buffers depends on the file system. Minimum is 80, I'd suggest something between 100 and 300. But note that each buffer needs as many bytes as the partition's block size. So if you have a block size of 512 and 100 buffers, you need 50k of memory for buffers.

MaxTransfer is not a rate, it specifies the biggest block transferred over the bus in one go. Set it to 0x10000 and it should be fine.

Mask specifies the memory area the controller can access. Usually this is 0x7ffffffe (2GB on even addresses).

Bye,
Thomas

[patrik]

Just wanted to add that atleast in my experience there are no problems using the default Mask and Max Transfer values HDToolBox sets with the WarpEngine. I have only used it with normal harddrives though, but the JAZ should behave as well as the harddrive as I doubt it breaks the basic scsi-specs.


/Patrik

[mgerics]

To Warp Users out there - I have a Wapr in an A3000, and I understand it is supposed to have a jumper to enable SCSI in the A3000 - I have neither this jumper nor sufficient documentaion to indicate hwre said jumper should go. Any help out there, guys? Thanks!

[doctorq]

@mgerics

Tried downloading the manual and addendum from here? Maybe it will reveal something interesting.

[ckillerh3]

Thomas and Patrik,

Thank you for the information, especially on the meaning of MaxTransfer, Buffers and Mask.  I will thy setting these parameters as per your suggestions and see if my Jaz drive starts to work properly.

Have a great day !