Getting into debugger on Apollo machines

[Bob Shannon]

Isn't there a switch for this?

I seem to recall older Apollo's had a sort of 'diag / normal' toggle...

----- Original Message ----- 
From: "Jules Richardson" <julesrichardsonuk at yahoo.co.uk>
To: "General Discussion: On-Topic and Off-Topic Posts" 
<cctalk at classiccmp.org>
Sent: Tuesday, March 22, 2005 4:28 PM
Subject: Getting into debugger on Apollo machines


>
> Before I go insane, can someone tell me the magic key sequence used to
> get into the mnemonic debugger at startup on Apollo machines?
> (Specifically a 425t, but I expect it's the same sequence on all
> flavours)
>
> I managed it - once, after much random tapping, and thought it was a
> simple double return that did it. Made the mistake of rebooting so I
> could move the machine to a more useful position, then discovered that
> it *wasn't* a double return.
>
> Nothing in the manuals (install / owner's guide, anyway) saying how to
> do it - they only mention how to do it from a machine that's already
> booted into the OS.
>
> The machine's sitting there trying to load across the network when it
> can't find an OS on local disk, which I don't want it to do - I've put
> an empty disk in there *because* I want to install an OS on it from
> local tape. There must be some way to interrupt it in order to get into
> the debugger. Grrr!
>
> (I could pull the token-ring board, but I have a feeling it's trying to
> boot across the onboard Ethernet anyway, not token-ring, so it wouldn't
> help)
>
> Maybe if I leave it long enough (like, more than the 20 mins I've given
> it already) it'll time out...
>
> cheers
>
> Jules
>
>