7 Dec
2009
7 Dec
'09
7:50 p.m.
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