26 Apr
2016
26 Apr
'16
6 p.m.
On Apr 26, 2016 2:35 PM, "Ian Finder" <ian.finder at gmail.com> wrote:
Does anyone out there have one of these controllers?
There is an unprotected PAL- the address decoder- and I really need a
dump of it.
Many programmers, particularly the BP technologies ones, can
read it
Curious how you know it is not a protected PAL? The PALs are protected on
all of the CMD CQD adapters I have looked at. I can't remember if I
bothered checking the PAL on my CDU-720/M
26 Apr
26 Apr
6:04 p.m.
The spec sheet from the PAL mfg. (signetics PLS173) seems to indicate
security fuses aren't an option on the model on my board. I have not
actually tried yet.
Failing that, if I can find one locally, there are only 12 bits of
combinatorial inputs.
I could easily whip up a little Arduino project on a breadboard to walk
thru all 4096 states and log the outputs for manual factoring.
- Ian
On Tue, Apr 26, 2016 at 3:00 PM, Glen Slick <glen.slick at gmail.com> wrote:
On Apr 26, 2016 2:35 PM, "Ian Finder"
<ian.finder at gmail.com> wrote:
--
Ian Finder
(206) 395-MIPS
ian.finder at gmail.com
Does anyone out there have one of these controllers?
There is an unprotected PAL- the address decoder- and I really need a
dump of it.
Many programmers, particularly the BP technologies ones, can
read it
Curious how you know it is not a protected PAL? The PALs are protected on
all of the CMD CQD adapters I have looked at. I can't remember if I
bothered checking the PAL on my CDU-720/M
9 p.m.
On Tue, Apr 26, 2016 at 3:04 PM, Ian Finder <ian.finder at gmail.com> wrote:
The spec sheet from the PAL mfg. (signetics PLS173)
seems to indicate
security fuses aren't an option on the model on my board. I have not
actually tried yet.
A PLS173 does not have a security fuse.
A PLUS173 does have a security fuse.
On my CMD CDU-720/M there are some PLS173 parts, but the CSR decode
PAL is a PLUS173 part, so I assume it is secured.
Double check whether the CSR decode PAL on your CDU-710 is a PLS173 or
a PLUS173.
-Glen
27 Apr
27 Apr
1:19 p.m.
It is most certainly PLS
On Tue, Apr 26, 2016 at 6:00 PM, Glen Slick <glen.slick at gmail.com> wrote:
On Tue, Apr 26, 2016 at 3:04 PM, Ian Finder
<ian.finder at gmail.com> wrote:
--
Ian Finder
(206) 395-MIPS
ian.finder at gmail.com
The spec sheet from the PAL mfg. (signetics
PLS173) seems to indicate
security fuses aren't an option on the model on my board. I have not
actually tried yet.
A PLS173 does not have a security fuse.
A PLUS173 does have a security fuse.
On my CMD CDU-720/M there are some PLS173 parts, but the CSR decode
PAL is a PLUS173 part, so I assume it is secured.
Double check whether the CSR decode PAL on your CDU-710 is a PLS173 or
a PLUS173.
-Glen
5:29 p.m.
It's the useless tape controller chip variant, but still worth dumping for
reference?
On Wed, Apr 27, 2016 at 10:36 AM, Glen Slick <glen.slick at gmail.com> wrote:
On Apr 27, 2016 10:19 AM, "Ian Finder"
<ian.finder at gmail.com> wrote:
--
Ian Finder
(206) 395-MIPS
ian.finder at gmail.com
It is most certainly PLS
Interesting. Then we should definitely try reading it and if we can we
should be able to turn the fuse map back into the logic equations. A PLS173
is a fairly straightforward device.
5:36 p.m.
On Wed, Apr 27, 2016 at 2:29 PM, Ian Finder <ian.finder at gmail.com> wrote:
It's the useless tape controller chip variant, but
still worth dumping for
reference?
I wouldn't say a SCSI tape controller is useless, always fun for
installing software from tape just for the heck of it. But that's
beside the point for now.
Anyway, yes it would be still worth dumping the CDU-710/T CSR decode
PAL fuse map just for reference and to confirm that are earlier
attempts are reverse engineering it were correct, and use that as the
starting point for a 710/M or 710/TM PAL in the absence of one of
those to also dump.
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