HP-IB disc drive emulation program available

[J. David Bryan]

On Monday, December 7, 2009 at 21:06, Tony Duell wrote:

> It doesn't (and can't) work with GPIB cards in the PC using the TMS9914
> chip. IIRC it's impossible to make an HP-compatible disk unit using a
> 9914 to talk to the HPIB, one part of the protocol requires you to do
> something the 9914 can't do (I forget the exact details). 

The HPDrive page states that the 9914 cannot implement the Amigo Identify 
command, as it uses a non-standard sequence (Untalk followed by a secondary 
addressed to the device).  Yet, I don't understand this claim, as my HP 
9134A disc drive uses a 9914A as its HP-IB controller, and it certainly 
responds to the Identify command.  If the 9914 in a 9134A can implement 
Identify, it is not clear to me why a software emulator using a 9914-based 
card can't implement Identify as well.

                                      -- Dave