A2091 question..

I am just getting back into my Amiga and originally I wanted to get my A1200 up to play some old games and Oh, IDK, just see what advances the Amiga world has since the C=64 is alive and well. Next thing you know, I now own an Amiga 2000HD, Video Toaster 2000, TBC-IV, a Supra RAM board with 5megs and an 030,22mhz accelerator w/5megs Fast RAM on board, (Kinda liking the 14,441,584 bytes). I also, have the 40meg HD drive that came with the A2000 and another 100meg HDD that I can't currently use per se' because it's looking for kickstart 2.xx or higher. That's ok, because I have Kickstart 3.1 ROM and Disks coming from Amigakit shortly. Wink

The A2000HD came with an A2091 SCSI controller, but the Accelerator has an on board SCSI controller too that dominates the A2091, so my question is, is there a way to have both HDD's going? Can the Amiga be configured to recognize the A2091? I cannot hook up the other HDD because I do not have an extra 4 prong power plug, but when I had the 40meg boot drive connected to it (A2091) the AMiga wouldn't boot, so when I connected it to the accelerator it worked no problem. The other power prong is going to a CD ROM Drive, (which I also cannot use since the drivers do not work with 1.3).

I know I'm asking these questions prematurely, but the 3.1 ROM and disks will be here soon, so I wanted to get prepared.

My game plan is to format the 40 meg and install 3.1 on it and use the 100meg to install the Toaster since it needs 40megs space to install. Oh and another question is can the A2000's PSU handle all this?

There has to be a way to run two internal SCSI Controllers. isn't there?

Best Regards,
Mr.Micro

[zipper]

Yes, they need just to have different SCSI IDs. Usually the controller ID is configurable.

[Toni Wilen]

Assuming your accelerator board's RAM is outside of 24-bit address space (which is most likely because 5M + 5M won't fit in Z2 space): Do not use A2091, because it only has 24-bit address space capable DMA controller (and Z2 bus is also only 24-bit), it becomes really slow (DMAs to chipram, CPU copy to fast RAM or vice versa) or does not work at all.

[Jope]

Originally Posted by zipper

Yes, they need just to have different SCSI IDs. Usually the controller ID is configurable.

Why would you connect both controllers to the same SCSI chain?

[thomas]

Originally Posted by Mr.Micro

There has to be a way to run two internal SCSI Controllers. isn't there?

You can use as many different SCSI controllers as fit into your machine. It's a matter of the controller's firmware / ROM whether it is recognised at boot time or not.

AFAIK the A2091 has a jumper which lets you enable or disable autoboot.

SCSI IDs only matter for devices connected to one controller. Different controllers can have the same SCSI IDs if they are not connected to each other.

[zipper]

Originally Posted by Jope

Why would you connect both controllers to the same SCSI chain?

Eh - must have been thinking a SCSI shared to two computers; done it ages ago.