9 Feb
2016
9 Feb
'16
9:47 p.m.
I have not opened up ours yet but I always assumed they were all DEC
boards.
Ed# _www.smecc.org_ (http://www.smecc.org)
In a message dated 2/9/2016 7:36:05 P.M. US Mountain Standard Time,
glen.slick at gmail.com writes:
On Tue, Feb 9, 2016 at 6:08 PM, Richard Cini <rich.cini at verizon.net>
wrote:
All ?
I picked-up a Heath H-11 machine the other day and it has a single 4kw
memory
board. From my prior experiences with DEC (an 11/34a many years ago;
now at the RI Computer Museum), I know my way around the field guide?but I?
m having trouble trying to identify the correct module number suitable for
the LSI-11 CPU. Even though it?s a Heath machine, I assume it?s module
compatible with DEC. Any help would be appreciated. Thanks!
Rich
Maybe an M8044 MSV11-D (no parity) or M8045 MSV11-E (parity) would be
most appropriate. They came in 4KW, 8KW, 16KW, and 32KW flavors.
http://manx.classiccmp.org/collections/antonio/dec/msv1dop1.pdf
Fairly common on eBay.
9 Feb
9 Feb
10:18 p.m.
Thanks guys. This is really helpful. I was getting confused between the M8044 and M7944
boards. Max memory for the LSI-11 is 32kw, right?
Rich Cini
Sent from my iPad
On Feb 9, 2016, at 9:47 PM, COURYHOUSE at aol.com
wrote:
I have not opened up ours yet but I always assumed they were all DEC
boards.
Ed# _www.smecc.org_ (http://www.smecc.org)
In a message dated 2/9/2016 7:36:05 P.M. US Mountain Standard Time,
glen.slick at gmail.com writes:
On Tue, Feb 9, 2016 at 6:08 PM, Richard Cini <rich.cini at verizon.net>
wrote:
All ?
I picked-up a Heath H-11 machine the other day and it has a single 4kw
memory
board. From my prior experiences with DEC (an 11/34a many years ago;
now at the RI Computer Museum), I know my way around the field guide?but I?
m having trouble trying to identify the correct module number suitable for
the LSI-11 CPU. Even though it?s a Heath machine, I assume it?s module
compatible with DEC. Any help would be appreciated. Thanks!
Rich
Maybe an M8044 MSV11-D (no parity) or M8045 MSV11-E (parity) would be
most appropriate. They came in 4KW, 8KW, 16KW, and 32KW flavors.
http://manx.classiccmp.org/collections/antonio/dec/msv1dop1.pdf
Fairly common on eBay. 
10:35 p.m.
yes 32kw and it works nicely got one in mine
On Tue, Feb 9, 2016 at 9:18 PM, Rich Cini <rich.cini at verizon.net> wrote:
Thanks guys. This is really helpful. I was getting
confused between the
M8044 and M7944 boards. Max memory for the LSI-11 is 32kw, right?
Rich Cini
Sent from my iPad
On Feb 9, 2016, at 9:47 PM, COURYHOUSE at aol.com
wrote:
I have not opened up ours yet but I always assumed they were all DEC
boards.
Ed# _www.smecc.org_ (http://www.smecc.org)
In a message dated 2/9/2016 7:36:05 P.M. US Mountain Standard Time,
glen.slick at gmail.com writes:
On Tue, Feb 9, 2016 at 6:08 PM, Richard Cini <rich.cini at verizon.net>
wrote:
ago;
All ?
I picked-up a Heath H-11 machine the other day and it has a single 4kw
memory
board. From my prior experiences with DEC (an 11/34a many years now at the RI Computer Museum), I know my way
around the field
guide?but I?
m having trouble trying to identify the correct
module number suitable
for
the LSI-11 CPU. Even though it?s a Heath machine,
I assume it?s module
compatible with DEC. Any help would be appreciated. Thanks!
Rich
Maybe an M8044 MSV11-D (no parity) or M8045 MSV11-E (parity) would be
most appropriate. They came in 4KW, 8KW, 16KW, and 32KW flavors.
http://manx.classiccmp.org/collections/antonio/dec/msv1dop1.pdf
Fairly common on eBay. 
10:44 p.m.
Hi Rich,
The M8044 MSV11-D is a lot more common than the M8045. I would say the
MSV11-D would mad put your system nicely and should cost no more than $50,
possibly well under that.
Paul
On Tue, Feb 9, 2016 at 9:18 PM, Rich Cini <rich.cini at verizon.net> wrote:
Thanks guys. This is really helpful. I was getting
confused between the
M8044 and M7944 boards. Max memory for the LSI-11 is 32kw, right?
Rich Cini
Sent from my iPad
On Feb 9, 2016, at 9:47 PM, COURYHOUSE at aol.com
wrote:
I have not opened up ours yet but I always assumed they were all DEC
boards.
Ed# _www.smecc.org_ (http://www.smecc.org)
In a message dated 2/9/2016 7:36:05 P.M. US Mountain Standard Time,
glen.slick at gmail.com writes:
On Tue, Feb 9, 2016 at 6:08 PM, Richard Cini <rich.cini at verizon.net>
wrote:
ago;
All ?
I picked-up a Heath H-11 machine the other day and it has a single 4kw
memory
board. From my prior experiences with DEC (an 11/34a many years now at the RI Computer Museum), I know my way
around the field
guide?but I?
m having trouble trying to identify the correct
module number suitable
for
the LSI-11 CPU. Even though it?s a Heath machine,
I assume it?s module
compatible with DEC. Any help would be appreciated. Thanks!
Rich
Maybe an M8044 MSV11-D (no parity) or M8045 MSV11-E (parity) would be
most appropriate. They came in 4KW, 8KW, 16KW, and 32KW flavors.
http://manx.classiccmp.org/collections/antonio/dec/msv1dop1.pdf
Fairly common on eBay. 
10:47 p.m.
Rich Cini wrote:
Thanks guys. This is really helpful. I was getting
confused between the M8044 and M7944 boards. Max memory for the LSI-11 is 32kw, right?
Correct, the maximum memory on a board is 32kw.
For an LSI-11 (aka PDP-11/03) without any MMU hardware,
the actual maximum memory that can be accessed must also allow
for the IOPAGE registers. Usually, the IOPAGE address range
is 4 kw which leaves 28kw for everything else, including RT-11
(assuming that is what you are running). There is one option
available with some hardware to reduce the address range
set aside for the IOPAGE to just 2kw which then leaves
30kw for everything else. Unless you are running a specific
program which requires the extra 2kw, it is probably not
worth the extra effort.
Jerome Fine
10 Feb
10 Feb
6:19 a.m.
Jerome -- good point about the IOPAGE. Maybe I'll get an 8kw and 16kw board -- that
gives me 28kw with the included 4kw. I have no specific software so I don't need to
tinker with reducing IOPAGE.
Rich
Sent from my iPhone
On Feb 9, 2016, at 10:47 PM, Jerome H. Fine
<jhfinedp3k at compsys.to> wrote:
Rich Cini wrote:
Thanks guys. This is really helpful. I was
getting confused between the M8044 and M7944 boards. Max memory for the LSI-11 is 32kw,
right?
Correct, the maximum memory on a board is 32kw.
For an LSI-11 (aka PDP-11/03) without any MMU hardware,
the actual maximum memory that can be accessed must also allow
for the IOPAGE registers. Usually, the IOPAGE address range
is 4 kw which leaves 28kw for everything else, including RT-11
(assuming that is what you are running). There is one option
available with some hardware to reduce the address range
set aside for the IOPAGE to just 2kw which then leaves
30kw for everything else. Unless you are running a specific
program which requires the extra 2kw, it is probably not
worth the extra effort.
Jerome Fine
8:14 a.m.
I just picked up an M8044-CC (16kw) so that should hold me for a while. I need to print
the manual so I can set the switches right.
Thanks all!
Sent from my iPhone
On Feb 9, 2016, at 10:47 PM, Jerome H. Fine
<jhfinedp3k at compsys.to> wrote:
Rich Cini wrote:
Thanks guys. This is really helpful. I was
getting confused between the M8044 and M7944 boards. Max memory for the LSI-11 is 32kw,
right?
Correct, the maximum memory on a board is 32kw.
For an LSI-11 (aka PDP-11/03) without any MMU hardware,
the actual maximum memory that can be accessed must also allow
for the IOPAGE registers. Usually, the IOPAGE address range
is 4 kw which leaves 28kw for everything else, including RT-11
(assuming that is what you are running). There is one option
available with some hardware to reduce the address range
set aside for the IOPAGE to just 2kw which then leaves
30kw for everything else. Unless you are running a specific
program which requires the extra 2kw, it is probably not
worth the extra effort.
Jerome Fine
3119
days inactive
3119
days old
6 comments
5 participants
participants (5)
-
COURYHOUSE＠aol.com -
jhfinedp3k＠compsys.to -
rich.cini＠verizon.net -
tdk.knight＠gmail.com -
useddec＠gmail.com