[Coco] B&B XTROM

[Steven Hirsch]

On Wed, 14 Jan 2009, Chester Patterson wrote:

> B&B rigs (of which I configured and sold several during my stint at Howard
> Medical) do not require a PROM installed in the controller (we used the
> DTC-5150 controller, several others were possible) The drive parameters
> (cylinders, tracks, etc) are set by the jumpers on the controller. The only
> PROM sold for the B&B rig was optional, it was the AutoBoot PROM. If
> purchased, it was installed instead of the BIOS PROM supplied standard with
> the controller. It first does a RAM test thereby allowing the hard disk to
> come up to speed. Then it checks track 128 for the OS9 bootstrap module
> (modified to access the hard disk) and boots OS9 from the hard disk. If you
> hold down the ALT key during the RAM test then the PROM looks instead for
> the bootstrap module on track 129. This allows you to have two separate
> OS9Boot on a single drive. I used this feature to boot into either OS9
> command line prompt or OS9 Multivue.

Ok, so if the controller's slot in the MultiPak is selected at reset, the 
ROM code gets control immediately?


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