HP 9845 C with 280 option startup failure

[Tequi Lizer]

> My 9845B came with a 3rd party mass storage ROM module. I am told this 
> allows the use of HPIB disks (probably Amigo protocol). The main use of 
> it so far has been due to the fact that it was a little PCB with normal 
> chips on it, not an HP hybrid. Very useful for figuring out what the ROM 
> module connections are.
>   
Did you ever try to connect your machine to one of the earlier 
5,25"-amigo-drives (like the 82901 or the 9135A)? These drives should be 
supported by your 3rd party ROM, and have the charme they should be able 
to read disks produced by a standard 5,25" PC drive in combination with 
the Teledisk utility from www.hpmuseum.net, where a couple of nice 98x5 
software archives is provided as well. The transfer alternative is a 
crude procedure decribed at the said site.

-Ansgar