Re: IIc/UniDisk Crash to Monitor

[mark@trillian.jsc.nasa.gov (Mark Manning)]

In article <28ro7iINN3da@iraun1.ira.uka.de>, voss@i40s5.ira.uka.de (Stefan
Voss) wrote:
> 
> |> 205A-       M=00  A=18  X=00  Y=07  P=33  S=F5
>    ^^^^        ^^^^  ^^^^  ^^^^  ^^^^  ^^^^  ^^^^
>      |          |     |      |     |     |    |
>  address where  |     |      |     |     |    |
>  the crash      | Accumulator|   Y-Reg   |  Stack pointer
>  occurred (BRK) |           X-Reg        |
>               dunno                  Processor status
>                                      (zero flag, negative flag, ...)

I'm not sure either, but I think the "M=00" is what was contained at
memory address $205A.  (Which is the BRK command.)

What this sounds like is one of three things:

1. The power supply is having problems with the added burden of
   running the 3.5" disk drive.

2. You may need to open up the //c and clean the inside.  If enough
   dust has accumulated, then you could be having a short somewhere.

3. Try disconnecting and then reconnecting the 3.5" disk drive.
   Sometimes the cable doesn't make a good connection.

I hope this helps. :)
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mark@trillian.jsc.nasa.gov