18 Feb
2020
18 Feb
'20
7:02 p.m.
Looking for a DECMATE (VT-278 model) RX278 Floppy Drive Interface Connector
cable, part number is RC26N-2L It's a 37 male-25 pin male cable.
Here is photo I took of one (not mine)
https://www.vintagecomputer.net/digital/DECmate/DECMATE_VT278_PortsDriveCab…
I have the pinouts for the 37-pin end but not the 25-pin end. If no one
has a cable I can do a continuity test of the cable next time I have access
one, but it's not easily available.
I am located near Philadelphia.
Thanks
Bill
19 Feb
19 Feb
1:45 a.m.
Hm. I have the bulkhead 25 pin to 40 pin interface thing from an RX02 in
a box, I'm not using it as I am going from the pdp11's RX01 straight to
the drive's controller. That should give you the pinout, want to borrow it?
C
On 2/18/2020 10:02 PM, Bill Degnan via cctech wrote:
Looking for a DECMATE (VT-278 model) RX278 Floppy
Drive Interface Connector
cable, part number is RC26N-2L It's a 37 male-25 pin male cable.
Here is photo I took of one (not mine)
https://www.vintagecomputer.net/digital/DECmate/DECMATE_VT278_PortsDriveCab…
I have the pinouts for the 37-pin end but not the 25-pin end. If no one
has a cable I can do a continuity test of the cable next time I have access
one, but it's not easily available.
I am located near Philadelphia.
Thanks
Bill
5:21 a.m.
Thanks chris...its a 37 pin on the vt278 end.
On Wed, Feb 19, 2020, 7:10 AM Chris Zach via cctech <cctech at classiccmp.org>
wrote:
Hm. I have the bulkhead 25 pin to 40 pin interface
thing from an RX02 in
a box, I'm not using it as I am going from the pdp11's RX01 straight to
the drive's controller. That should give you the pinout, want to borrow it?
C
On 2/18/2020 10:02 PM, Bill Degnan via cctech wrote:
Looking for a DECMATE (VT-278 model) RX278 Floppy
Drive Interface
Connector
cable, part number is RC26N-2L It's a 37
male-25 pin male cable.
Here is photo I took of one (not mine)
https://www.vintagecomputer.net/digital/DECmate/DECMATE_VT278_PortsDriveCab…
I have the pinouts for the 37-pin end but not the 25-pin end. If no one
has a cable I can do a continuity test of the cable next time I have
access
one, but it's not easily available.
I am located near Philadelphia.
Thanks
Bill
6:49 a.m.
sorry if you have already thought of this and I might be wrong, is the
278 cable the same as the vt78 RX cable?
I recall the external drive cable was a 37 pin male and a 25 pin male
but not all the pins were used in either one.
IIRC it was the same connector as used for the DP78 and LPT (DP78 was
used instead of LPT, as it was a parallel IO path used by the VT78)
Don't know if this helps....My memory is rusty, I did not work on the
DecMate series.
bob
On Wed, Feb 19, 2020 at 8:21 AM Bill Degnan via cctech
<cctech at classiccmp.org> wrote:
Thanks chris...its a 37 pin on the vt278 end.
On Wed, Feb 19, 2020, 7:10 AM Chris Zach via cctech <cctech at classiccmp.org>
wrote:
> Hm. I have the bulkhead 25 pin to 40 pin interface thing from an RX02 in
> a box, I'm not using it as I am going from the pdp11's RX01 straight to
> the drive's controller. That should give you the pinout, want to borrow it?
>
> C
>
> On 2/18/2020 10:02 PM, Bill Degnan via cctech wrote:
> > Looking for a DECMATE (VT-278 model) RX278 Floppy Drive Interface
> Connector
> > cable, part number is RC26N-2L It's a 37 male-25 pin male cable.
> >
> > Here is photo I took of one (not mine)
> >
> https://www.vintagecomputer.net/digital/DECmate/DECMATE_VT278_PortsDriveCab…
> >
> > I have the pinouts for the 37-pin end but not the 25-pin end. If no one
> > has a cable I can do a continuity test of the cable next time I have
> access
> > one, but it's not easily available.
> >
> > I am located near Philadelphia.
> >
> > Thanks
> >
> > Bill
> >
>
6:58 a.m.
If it will help send me your address off-list and I will drop it in the
mail. Just send it back when done. You should be able to map the 40 pin
from the RX02 to the 25 pins on the plug, which can
then be used to map
to your 37 pin pinout on the VT278.
C
On 2/19/2020 8:21 AM, Bill Degnan via cctech wrote:
Thanks chris...its a 37 pin on the vt278 end.
On Wed, Feb 19, 2020, 7:10 AM Chris Zach via cctech <cctech at classiccmp.org>
wrote:
> Hm. I have the bulkhead 25 pin to 40 pin interface thing from an RX02 in
> a box, I'm not using it as I am going from the pdp11's RX01 straight to
> the drive's controller. That should give you the pinout, want to borrow it?
>
> C
>
> On 2/18/2020 10:02 PM, Bill Degnan via cctech wrote:
>> Looking for a DECMATE (VT-278 model) RX278 Floppy Drive Interface
> Connector
>> cable, part number is RC26N-2L It's a 37 male-25 pin male cable.
>>
>> Here is photo I took of one (not mine)
>>
> https://www.vintagecomputer.net/digital/DECmate/DECMATE_VT278_PortsDriveCab…
>>
>> I have the pinouts for the 37-pin end but not the 25-pin end. If no one
>> has a cable I can do a continuity test of the cable next time I have
> access
>> one, but it's not easily available.
>>
>> I am located near Philadelphia.
>>
>> Thanks
>>
>> Bill
>>
>
8:14 a.m.
On Wed, Feb 19, 2020 at 5:10 AM Chris Zach via cctalk
<cctalk at classiccmp.org> wrote:> Hm. I have the bulkhead 25 pin to 40
pin interface thing from an RX02 in
a box, I'm not using it as I am going from the
pdp11's RX01 straight to
the drive's controller. That should give you the pinout, want to borrow it?
I already sent Bill the pinouts of both ends, but for the benefit of
the list archives, the DB25-BERG end is documented at:
http://www.pdp8online.com/pdp8docs/rx02pinout.txt
-ethan
9:37 a.m.
On Wed, Feb 19, 2020 at 11:15 AM Ethan Dicks via cctalk <
cctalk at classiccmp.org> wrote:
On Wed, Feb 19, 2020 at 5:10 AM Chris Zach via cctalk
<cctalk at classiccmp.org> wrote:> Hm. I have the bulkhead 25 pin to 40
pin interface thing from an RX02 in
thanks Ethan...I saw this page but did not recognize that the pins were
labeled to match what's in the 278 manual. One just has to match the label
to the pin on the other end.
b
a box, I'm not using it as I am going from
the pdp11's RX01 straight to
the drive's controller. That should give you the pinout, want to borrow
it?
I already sent Bill the pinouts of both ends, but for the benefit of
the list archives, the DB25-BERG end is documented at:
http://www.pdp8online.com/pdp8docs/rx02pinout.txt
-ethan
9:45 a.m.
New subject: DECMATE (VT-278 model) RX278 Floppy Drive Interface Connector cable wanted
re-posted with subject
On Wed, Feb 19, 2020 at 12:37 PM Bill Degnan <billdegnan at gmail.com> wrote:
On Wed, Feb 19, 2020 at 11:15 AM Ethan Dicks via cctalk <
cctalk at classiccmp.org> wrote:
On Wed, Feb 19, 2020 at 5:10 AM Chris Zach via
cctalk
<cctalk at classiccmp.org> wrote:> Hm. I have the bulkhead 25 pin to 40
pin interface thing from an RX02 in
thanks Ethan...I saw this page but did not recognize that the pins were
labeled to match what's in the 278 manual. One just has to match the label
to the pin on the other end.
b
a box, I'm not using it as I am going from
the pdp11's RX01 straight to
the drive's controller. That should give you the pinout, want to borrow
it?
I already sent Bill the pinouts of both ends, but for the benefit of
the list archives, the DB25-BERG end is documented at:
http://www.pdp8online.com/pdp8docs/rx02pinout.txt
-ethan
2:15 p.m.
New subject: DECMATE (VT-278 model) RX278 Floppy Drive Interface Connector cable wanted
On Wed, Feb 19, 2020 at 10:45 AM Bill Degnan <billdegnan at gmail.com> wrote:
On Wed, Feb 19, 2020 at 12:37 PM Bill Degnan
<billdegnan at gmail.com> wrote:
> On Wed, Feb 19, 2020 at 11:15 AM Ethan Dicks via cctalk <cctalk at
classiccmp.org> wrote:
>>
>> On Wed, Feb 19, 2020 at 5:10 AM Chris Zach via cctalk
>> <cctalk at classiccmp.org> wrote:> Hm. I have the bulkhead 25 pin to 40
>> pin interface thing from an RX02 in
>> > a box, I'm not using it as I am going from the pdp11's RX01 straight
to
>> > the drive's controller. That should give you the pinout, want to borrow
it?
>>
>> I already sent Bill the pinouts of both ends, but for the benefit of
>> the list archives, the DB25-BERG end is documented at:
>>
>> http://www.pdp8online.com/pdp8docs/rx02pinout.txt
>>
>> -ethan
>
> thanks Ethan...I saw this page but did not recognize that the pins were labeled to
match what's in the 278 manual. One just has to match the label to the pin on the
other end.
And for the DECmate end (since I forgot to post that the first
time)... it's documented in "ED-VT278-HR-001 DECmate System
Architecture Manual" in Figure F-2
-ethan
1530
days inactive
1530
days old
8 comments
4 participants
participants (4)
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billdegnan＠gmail.com -
bobsmithofd＠gmail.com -
cz＠alembic.crystel.com -
ethan.dicks＠gmail.com