4 Mar
2010
4 Mar
'10
5:19 a.m.
Forgive my lack of hardware knowledge...
What if I took this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=310201616232&rvr…
Desoldered the female ISA connector, then soldered it to the underside of a
passive backplane. Would I have goofy reliability problems? Would it even
work?
brian
4 Mar
4 Mar
5:36 a.m.
On 3 Mar 2010 at 23:19, Brian Lanning wrote:
Desoldered the female ISA connector, then soldered it
to the underside
of a passive backplane. Would I have goofy reliability problems?
Would it even work?
I don't follow you. Are you trying to replace/add a connector to an
existing backplane because an existing one is faulty?
--Chuck
7:22 a.m.
G'day,
On 4 March 2010 05:19, Brian Lanning <brianlanning at gmail.com> wrote:
[ISA Bus Extender for Maintenance / Debugging]
Desoldered the female ISA connector, then soldered it
to the underside of a
passive backplane. Would I have goofy reliability problems? Would it even
work?
AFAIK, the ISA bus works sufficiently slowly that it doesn't need to
be treated like a transmission line. So, if it does work, it probably
will.
How are you intending to swap the pins? If you solder the connector
straight to the underside of the motherboard, mounting the ISA card up
side down, the pins on each side of the ISA connector will be
incorrect.
Simon
--
------------------------------------------------------------------------
"Well, an engineer is not concerned with the truth; that is left to
philosophers and theologians: the prime concern of an engineer is
the utility of the final product."
Lectures on the Electrical Properties of Materials, L.Solymar, D.Walsh
1:02 p.m.
On Thu, Mar 4, 2010 at 1:22 AM, Simon Fryer <fryers at gmail.com> wrote:
AFAIK, the ISA bus works sufficiently slowly that it
doesn't need to
be treated like a transmission line. So, if it does work, it probably
will.
How are you intending to swap the pins? If you solder the connector
straight to the underside of the motherboard, mounting the ISA card up
side down, the pins on each side of the ISA connector will be
incorrect.
I wasn't real clear with the original email. The idea is to add more isa
slots to a computer without having to pay for a really expensive bus
extender.
I thought about the pin orientation. I'm thinking with this thing, I could
make the female edge connector on this replace one of the slots on the
passive back plane. That would fix the orientation problem, right? So the
passive back plane would be parallel to and above the main motherboard of
the computer. This riser board would plug into the main motherboard. And
the connector on the other end could be desoldered and the riser board
resoldered to the underside of the passibe back plane. The slots on the
passive back plane wouldn't face the main motherboard, they'd face away.
Does that make sense?
What I'd really like to do is get a female to female adapter for the isa bus
and just plug that into the motherboard and the passive back plane, making
the slot sides of the two boards face each other. But I think that would
cause the orientation problem you're describing. Is that right?
brian
1:49 p.m.
Simon Fryer wrote:
G'day,
On 4 March 2010 05:19, Brian Lanning <brianlanning at gmail.com> wrote:
[ISA Bus Extender for Maintenance / Debugging]
Yes, IME it seems to accept a lot of abuse without problems (I remember
building a "poor man's X terminal" once into a case about 30cm high using
stock PC hardware and net-booting Linux - I employed some creative cutting of
an ISA extender, removing unecessary sockets and PCB to reduce height, so that
I could run the video and network boards parallel to the motherboard)
It's probably slow enough (8MHz, IIRC) that Brian could even use shielded
ribbon cable to connect his motherboard to his backplane and it'd still work -
although perhaps such a permanent solution isn't what he's after.
cheers
Jules
Desoldered the female ISA connector, then
soldered it to the underside of a
passive backplane. Would I have goofy reliability problems? Would it even
work?
AFAIK, the ISA bus works sufficiently slowly that it doesn't need to
be treated like a transmission line. So, if it does work, it probably
will. 
10:25 a.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org
[mailto:cctalk-bounces at classiccmp.org] Namens Brian Lanning
Verzonden: donderdag 4 maart 2010 6:19
Aan: General Discussion: On-Topic and Off-Topic Posts
Onderwerp: would this work?
Forgive my lack of hardware knowledge...
What if I took this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=31020161623
2&rvr_id=&crlp=1_263602_263622&UA=WVF%3F&GUID=fbd9ae461220a043
7161e4b1ffdf44f7&itemid=310201616232&ff4=263602_263622
Desoldered the female ISA connector, then soldered it to the
underside of a passive backplane. Would I have goofy
reliability problems? Would it even work?
brian
If I understand you right, you're soldering the ISA connector to the bottom
of another ISA connector.
If so, all the signals are mirrored on the ISA connector you soldered on the
backside, it woudn't work just smoke ;-)
-Rik
1:04 p.m.
On Thu, Mar 4, 2010 at 4:25 AM, Rik Bos <hp-fix at xs4all.nl> wrote:
If I understand you right, you're soldering the
ISA connector to the bottom
of another ISA connector.
If so, all the signals are mirrored on the ISA connector you soldered on
the
backside, it woudn't work just smoke ;-)
I said it poorly. Desolder the female isa connector on the riser board and
throw it away. Then solder the riser board to the underside of the passive
backplane.
brian
5413
days inactive
5413
days old
6 comments
5 participants
participants (5)
-
brianlanning＠gmail.com -
cclist＠sydex.com -
fryers＠gmail.com -
hp-fix＠xs4all.nl -
jules.richardson99＠gmail.com