24 Sep
2014
24 Sep
'14
2:32 p.m.
Hi there,
I have a floating point processor (FPP) on a currently unused 11/23 CPU
M8186 card (KDF-11A). From the manual, looks like this is a KEF11-A.
Also, in my working 11/23+ with KDF-11BA, I have no FPP. Makes it hard to
use Fortran-77. The KDF-11BA manual refers to a KEF-11AA FPP.
Does anyone know if the FPP unit is compatible from the 11/23 to the 11/23+
- i.e., can I transplant the FPP chip from the 11/23 to the 11/23+ CPU
card? Could it be that simple? :-)
Please be gentle if this is a stupid question. I've used my best Google-fu
and RTFMing to find the answer (and learned some new things about these
cards in the process).
Thanks!
- Earl
24 Sep
24 Sep
3:36 p.m.
Does anyone know if the FPP unit is compatible from the 11/23 to the 11/23+
- i.e., can I transplant the FPP chip from the 11/23 to the 11/23+ CPU
card? Could it be that simple? :-)
Please be gentle if this is a stupid question.
It's really not a stupid question. I've wondered myself, I've also got both
CPUs.
My _guess_ is that since both are KDF chipset CPUs, it may work.
I've used my best Google-fu
and RTFMing to find the answer (and learned some new things about these
cards in the process).
Thanks!
- Earl
8:18 p.m.
No, you need the FPF11 for 11/23+
On Wed, Sep 24, 2014 at 2:36 PM, Roe Peterson <roeapeterson at gmail.com>
wrote:
Does anyone know if the FPP unit is compatible from the 11/23 to the
11/23+
- i.e., can I transplant the FPP chip from the
11/23 to the 11/23+ CPU
card? Could it be that simple? :-)
Please be gentle if this is a stupid question.
It's really not a stupid question. I've wondered myself, I've also got
both CPUs.
My _guess_ is that since both are KDF chipset CPUs, it may work.
I've used my best Google-fu
and RTFMing to find the answer (and learned some new things about these
cards in the process).
Thanks!
- Earl
3:58 p.m.
On Sep 24, 2014, at 2:32 PM, Earl Evans <earl at retrobits.com> wrote:
Hi there,
I have a floating point processor (FPP) on a currently unused 11/23 CPU
M8186 card (KDF-11A). From the manual, looks like this is a KEF11-A.
Also, in my working 11/23+ with KDF-11BA, I have no FPP. Makes it hard to
use Fortran-77. The KDF-11BA manual refers to a KEF-11AA FPP.
Does anyone know if the FPP unit is compatible from the 11/23 to the 11/23+
- i.e., can I transplant the FPP chip from the 11/23 to the 11/23+ CPU
card? Could it be that simple? :-)
Please be gentle if this is a stupid question. I've used my best Google-fu
and RTFMing to find the answer (and learned some new things about these
cards in the process).
No worries, not a stupid question. It should be possible; the F-11
processor extensions (FPP, CIS) are just microcode ROMs for the same
data/control/MMU chipset, so it should work nicely on your 11/23+
board. Make sure you have the MMU, though, because it uses the MMU
chip for the FP registers; I assume you have one, since I think the
11/23+ came with one by default.
There's a lot detailing the theory of operation for the KDF-11 CPU
in its manual, if you're interested. It's very nicely described.
- Dave
6:45 p.m.
On 24/09/2014 19:32, Earl Evans wrote:
I have a floating point processor (FPP) on a currently
unused 11/23 CPU
M8186 card (KDF-11A). From the manual, looks like this is a KEF11-A.
Also, in my working 11/23+ with KDF-11BA, I have no FPP.
Does anyone know if the FPP unit is compatible from the 11/23 to the 11/23+
- i.e., can I transplant the FPP chip from the 11/23 to the 11/23+ CPU
card? Could it be that simple? :-)
Yes, it is that simple. The same IC is used in both. It's just a
microcode ROM (MICROM). The registers it uses are in the MMU chip, so
you need that as well.
--
Pete
25 Sep
25 Sep
11:26 p.m.
Yes, it is that simple. The same IC is used in both.
It's just a
microcode ROM (MICROM). The registers it uses are in the MMU chip, so you
need that as well.
--
Pete
Thanks to everyone for the responses. You'll be happy to know that the
transplant went well. I now have hardware floating point in the 11/23+ (as
confirmed with SHOW CONFIG), and my Fortran-77 won't yell at me anymore.
Cheers,
- Earl
3592
days inactive
3594
days old
6 comments
6 participants
participants (6)
-
earl＠retrobits.com -
fraveydank＠gmail.com -
julian＠twinax.org -
pete＠dunnington.plus.com -
roeapeterson＠gmail.com -
spacewar＠gmail.com