HP 9845 C with 280 option startup failure

Tony Duell ard at p850ug1.demon.co.uk
Sun Nov 13 12:37:25 CST 2005

> I tried to pull those monitor signals high, however the effect is the 

I thouhgt at least one of them (end-of-frame, probably) had to be a pulse 
signal of about the right frequency.

> Since I assume you've got a running system, can you tell me whether the 
> system tries to launch the autost program from a 9845 tape before, 
> during or after the power-on memory test (in case the "auto st" key is 
> latched, a tape is inserted and the system is being switched on)? If the 
> program is read from tape _after_ the power-on test has been completed, 
> I'll have to find another way.

Hmm... There's no way I can get to the 9845 to power it up until I've got 
various other things off the bench :-(. And I think my tape drives need 
new rollers (too many projects, too little time :-)).

At a guess, I would assume it looked at the tape drives only after it had 
got the memory test completed, alas.


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