I agree, but in addition to getting the main system disk back up, I have
an ST506 emulator from David Gesswein that I would like to get working
after I built it. My Plessey DCV54 does not even offer a drive select
signal!
cheers,
Nigel
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype: TILBURY2591
On 2022-09-05 20:12, Chris Zach via cctalk wrote:
I have a spare RQDX3, but I really recommend finding an ESDI
controller. It is literally a slug compared to my MTI ESDI controller.
C
On 9/5/2022 5:34 PM, Nigel Johnson Ham via cctalk wrote:
So now, like me, you are stuck with a bunch of ESDI drives and no
controller!
I do have one DQ696, on my MVII in a BA123 box, but the other
controller was a Sigma that developed in internal faulure and which I
used for RT11 on my 11/73 BA23 box.
Now I have to share the one controller between the two boxes. RT11
one day and NetBSD another!
Like you, I sold all sorts of stuff for a song, including a
millivolt-on-HVAC common mode DT2765 a/d card that was $3000 when
new! I also had 3 KA630s and accidentally sold two, so now I do not
have a spare for the microvax either!
If anybody out there has a DQ696 or an RQDX3 available, I'd like to
hear from you!
cheers,
Nigel
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype: TILBURY2591
On 2022-09-05 17:19, Jon Elson via cctalk wrote:
On 9/5/22 13:46, Nigel Johnson Ham via cctalk wrote:
If I tell you that they are not, will you think I am just trying to
get the QD21 from you? I need one to replace the Sigma ESDI
controller that failed, and no its format is not the same either.
They also had a choice of hard vs soft sectoring. I believe Emulex
and Dilog handled the RCT differently on the disk too.
Let me know if you are willing to part with the QD21.
Sorry, going through emails from 2012, it seems I sold the QD21 for
a song back then.
Wow, really crazy when you don't know what you dreamed and what you
really did! But, I sure can't put my hands on it now!
Jon
