14 Feb
2021
14 Feb
'21
12:30 p.m.
Has anybody got a DCV54 that they are using?
I am trying to get one working with David Gasswein's mfm board and
having no luck.
The controller is working fine with a standard floppy as an RX33, even
boots the MicroVAX from it.? But on-board diagnostics cannot format or
even recognise the mfm board as a winchester.
Just got the scope out today and found that the drive select lines are
being terminated OK on the mfm board, bit the controller is not even
dropping drive select. (Yes I have tried new cables)
Problem is I don't have anything old enough to test the mfm boards with
other than the Plessey controlelr!
I'm thinking there must be some on-board config that I am missing on the
controller. - It has never had a real mfm drive connected to it.
Any help appreciated,
Nigel
--
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype: TILBURY2591 nw.johnson at ieee.org
14 Feb
14 Feb
12:36 p.m.
On Feb 14, 2021, at 3:30 PM, Nigel Johnson via cctalk
<cctalk at classiccmp.org> wrote:
Has anybody got a DCV54 that they are using?
I am trying to get one working with David Gasswein's mfm board and
having no luck.
The controller is working fine with a standard floppy as an RX33, even
boots the MicroVAX from it. But on-board diagnostics cannot format or
even recognise the mfm board as a winchester.
Just got the scope out today and found that the drive select lines are
being terminated OK on the mfm board, bit the controller is not even
dropping drive select. (Yes I have tried new cables)
Problem is I don't have anything old enough to test the mfm boards with
other than the Plessey controlelr!
I'm thinking there must be some on-board config that I am missing on the
controller. - It has never had a real mfm drive connected to it.
Any help appreciated,
Nigel
I had good luck with mine, though admittedly I have the advantage of having real drives to
compare with (that's on a DEC Pro).
Do you have the matching drive select jumper in place? Can you see the
"selected" signal being asserted by the board?
Just to be sure... remember that floppy cables and hard drive cables look similar but are
different and not interchangeable.
paul
2:39 p.m.
On Sun, Feb 14, 2021 at 1:36 PM Paul Koning via cctalk <
cctalk at classiccmp.org> wrote:
The two things I've been bitten by are making sure that dual cables have
the drive before the extra bit with the twist.
The other thing I've been bitten by isn't relevant here: I had the 20-pin
cable plugged into the wrong socket a few times when trying to image
disks...
Warner
On Feb 14, 2021, at 3:30 PM, Nigel Johnson via
cctalk <
cctalk at classiccmp.org> wrote:
Has anybody got a DCV54 that they are using?
I am trying to get one working with David Gasswein's mfm board and
having no luck.
The controller is working fine with a standard floppy as an RX33, even
boots the MicroVAX from it. But on-board diagnostics cannot format or
even recognise the mfm board as a winchester.
Just got the scope out today and found that the drive select lines are
being terminated OK on the mfm board, bit the controller is not even
dropping drive select. (Yes I have tried new cables)
Problem is I don't have anything old enough to test the mfm boards with
other than the Plessey controlelr!
I'm thinking there must be some on-board config that I am missing on the
controller. - It has never had a real mfm drive connected to it.
Any help appreciated,
Nigel
I had good luck with mine, though admittedly I have the advantage of
having real drives to compare with (that's on a DEC Pro).
Do you have the matching drive select jumper in place? Can you see the
"selected" signal being asserted by the board?
Just to be sure... remember that floppy cables and hard drive cables look
similar but are different and not interchangeable.
1176
days inactive
1176
days old
2 comments
3 participants
participants (3)
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imp＠bsdimp.com -
nw.johnson＠ieee.org -
paulkoning＠comcast.net