30 May
2018
30 May
'18
6:51 a.m.
From: Kyle Owen
I do have an 11/45, though... so with this
modification, I suppose one
could have some fun:
That's for the -11/40 - very different machine, one couldn't use the same
technique on the /45; the /40 is prepared to accept additional ucode on
additional CPU boards, that's how the EIA works:
http://gunkies.org/wiki/KE11-E_Extended_Instruction_Set
And it's custom boards, the design for which is no longer extant (pity, as
I'd love to play with one myself).
Finally, I have this vague memory that they had to put a few minor mods on
some of the existing CPU boards (details also lost), although my memory may
be misleading me on that.
Noel
30 May
30 May
8:01 a.m.
On Wed, May 30, 2018 at 8:51 AM, Noel Chiappa via cctalk <
cctalk at classiccmp.org> wrote:
Ah, I got confused! Thanks for the clarification! So the same technique
would work on the 11/35, then?
Kyle
From: Kyle
Owen
I do have an 11/45, though... so with this
modification, I suppose
one
could have some fun:
That's for the -11/40 - very different machine, one couldn't use the same
technique on the /45; the /40 is prepared to accept additional ucode on
additional CPU boards, that's how the EIA works:
8:43 a.m.
Van: Noel Chiappa via cctalk<mailto:cctalk at classiccmp.org>
Verzonden: woensdag 30 mei 2018 15:51
Aan: cctalk at classiccmp.org<mailto:cctalk at classiccmp.org>
CC: jnc at mercury.lcs.mit.edu<mailto:jnc at mercury.lcs.mit.edu>
Onderwerp: Re: Modifying microcode
From: Kyle Owen
I do have an 11/45, though... so with this
modification, I suppose one
could have some fun:
That's for the -11/40 - very different machine, one couldn't use the same
technique on the /45; the /40 is prepared to accept additional ucode on
additional CPU boards, that's how the EIA works:
http://gunkies.org/wiki/KE11-E_Extended_Instruction_Set
And it's custom boards, the design for which is no longer extant (pity, as
I'd love to play with one myself).
Finally, I have this vague memory that they had to put a few minor mods on
some of the existing CPU boards (details also lost), although my memory may
be misleading me on that.
Noel
I am (way too slow) repairing an 11/35, and I am looking at the details
of the CPU, execute micro-stepping, etc. In that process I got the idea
to develop some ?extended microcode patch? board ? but forgot about
it, because I?d better get the 11/35 fixed first.
My findings so far :
www.pdp-11.nl/pdp11-35/repair/repair35page.html<http://www.pdp-11.nl/pdp…
Comments are very welcome!
As the EIS and FIS are extensions on the microcode, the hardware does
support microcode extensions.
The only two PDP-11 processor that have microcode extension options
are the 11/60 and the LSI-II (WCS).
Henk, PA8PDP
10:33 a.m.
On May 30, 2018, at 6:51 AM, Noel Chiappa via cctalk
<cctalk at classiccmp.org> wrote:
I?m *very* familiar with the 11/40E as all of our 11/40?s at CMU had been ?upgraded?
to 11/40Es (including all of the ones on C.MMP).
I recall the updated micro-code board but I can?t recall if the main CPU boards needed
any mods. I?ll look over the CMU docs again and see if what might be required.
Did a little bit of micro-programming on the 11/40E but quickly found it was better to
concentrate on efficient algorithms. ;-) But to speed up kcalls in Hydra there was at
one point a lot of custom micro-code on the 11/40Es on C.MMP.
TTFN - Guy
From: Kyle Owen
I do have an 11/45, though... so with this
modification, I suppose one
could have some fun:
That's for the -11/40 - very different machine, one couldn't use the same
technique on the /45; the /40 is prepared to accept additional ucode on
additional CPU boards, that's how the EIA works:
http://gunkies.org/wiki/KE11-E_Extended_Instruction_Set
And it's custom boards, the design for which is no longer extant (pity, as
I'd love to play with one myself).
Finally, I have this vague memory that they had to put a few minor mods on
some of the existing CPU boards (details also lost), although my memory may
be misleading me on that.
2398
days inactive
2398
days old
3 comments
4 participants
participants (4)
-
ggs＠shiresoft.com -
henk.gooijen＠hotmail.com -
jnc＠mercury.lcs.mit.edu -
kylevowen＠gmail.com