11/45 works, but....

[Gooijen, Henk]

> -----Original Message-----
> From: cctalk-bounces at classiccmp.org 
> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Jay West
> Sent: dinsdag 20 maart 2007 1:38
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: 11/45 works, but....
> 
> Brad wrote....
> > Is the rx02 controller a dma device?  I'm probably wrong 
> but I don't 
> > think I've put it in slots where the NPR was removed.
> RX11 (RX01, M7846) is programmed I/O. RX211 (RX02, M8256) can 
> use DMA via non processor request. So... NPR jumper needs to 
> be removed for my M8256.
> 
> I checked tonight, and powering them both up (RL02 & RX02) 
> before the cpu makes no difference. If the RX02 is powered on 
> when the load button is hit on the RL02, the RL02 will fault 
> just after spinup. If the RX02 is powered off, the RL02 
> doesn't fault at any time and runs just fine.
> 
> My M8256 is set at address 177170, vector 264, priority BR5. 
> The M7762 is set at address 174400, vector 160, priority BR5. 
> I'm assuming both at BR5 isn't a problem?
> 
> Jay 


Taking a wild guess ... have you an AM radio near the 11/45?
Could it be that the RX02 when it is on generates a lot of
noise? I am thinking of worn brushes on the spindle motor, but
I am not sure that motor has carbon brushes ...

- Henk.


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