difference between LSI-11 CPU's M7264 and M7270

[Gooijen, Henk]

> -----Original Message-----
> From: cctalk-bounces at classiccmp.org 
> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Allison
> Sent: dinsdag 27 september 2005 16:18
> To: cctalk at classiccmp.org
> Subject: Re: (no subject)
> 
> >
> >Subject: (no subject)
> >   From: Frank Arnold <fm.arnold at gmx.net>
> >   Date: Tue, 27 Sep 2005 15:24:06 +0100
> >     To: cctalk at classiccmp.org
> >
> >>
> >>Message: 28
> >>Date: Mon, 26 Sep 2005 13:42:48 +0200
> >>From: "Gooijen, Henk" <GOOI at oce.nl>
> >>Subject: RE: difference between LSI-11 CPU's M7264 and M7270
> >>
> >>> -----Original Message-----
> >>> On Sep 26 2005,  8:40, Gooijen, Henk wrote:
> >>> 
> >>> 
> >>> <-- M7270 -LSI11/2--> <--- M8044 MSV11----> 
> >>> <------ empty ------> <--- M7940 DLV11---->
> >>> <------ empty ------> <------ empty ------>
> >>> <------ empty ------> <------ empty ------>
>
> >
> >Henk, there is no bootstrap in this system....
> >
> >>
> >>The FieldGuide says that a few lines are used for something 
> >>else, but I expect (hope) that the M7270 and the M7264 usage
> >>of all connections is identical.
> >
> >No, I think only the LSI11 suplies refresh to the bus, 
> >LSI11/02 does not.
> >They use some of the sspare lines for that, that much later got
> >used for Adressbits 19-21 once Q-bus got Q22
> 
> Correct on refresh, the 7270 does not provide it (not needed 
> for 8044 memory).
> However, the unused microcode lines are not used for refresh. 
>  Those are use for special (unimplmented) microcode. 
> 
> >>Regarding the M8018 WCS option: is this "just" a chip, like 
> >>FIS or the big CIS one?
> >
> >Those are LSI11/23 options...
> 
> The M8018 KUV11-AA is for the M7264 (LSI-11, KD11-f), I have 
> also tested it with M7270 (LSI11/2)(sort of a hack).
> 
> There was a microcode WCS option for the 11/23.  It is also a 
> board. I don't think it was ever sold.  There was a FPU option
> M8188 (FPF11) a quad width board for the 11/23 that was sold.
> 
> >Unfortunately I dont have this (still hunting), but yes, it
> >is a board. It takes only the power from the Q-bus and connects
> >with a flatcable to the microm socket on the LSI-11 module.
> >I also heard the fact that this works (or was DEC-supported) only
> >on the quad LSI11, but can't see a good reason for this, as the
> >chipset is identical. It even has the empty socket to connect the
> >WCS-option.  Maybe the engineering drawings will tell more.
> 
> It was design specific for the M7264-YC though it seemed to 
> work with any of the M7264 or M7270 modules (microcode 
> address specific caveat).
> The DEC supported config was on the M7264-YC. The difference 
> is that each microm socket has a unique microcode address and 
> is diagnostic specific.
> 
> Allison

Thanks, Frank and Allison.
I guess, now is a good moment to start reading the LSI-11 handbook
and to look out for a bootstrap kind of module !  Is there a specific
module to look for, or are there several possibilities?  Remember,
this system only has 4 slots (almost 2 occupied), and I want to add
at least modules to get some parallel I/O (TTL) lines, and to boot
the system from (Pete Collum's RXV11) ...

The idea that I have for this system is the following.
I want to use a small 486 system as terminal and mass storage.
The parallel I/O will interface to a filter-based RTTY demodulator.
Software (to be written) will turn this setup to a telex reception
station (transmitting RTTY will follow!)  I know that many programs
already exist for this (not on PDP-11), but I want to learn MACRO-11
and learning a language goes best if you have an application idea.
I expect it will not be difficult, after I learned the way MACRO-11
wants its assembly text, because it looks quite like M68000 mnemonics.
That will probably cause some pitfalls, but I must look up all the
PDP-11 mnemonics in the beginning anyway.

Fun job for this winter!

  73,
- Henk, PA8PDP.