difference between LSI-11 CPU's M7264 and M7270

[Allison]

>
>Subject: RE: difference between LSI-11 CPU's M7264 and M7270
>   From: "Gooijen, Henk" <GOOI at oce.nl>
>   Date: Tue, 27 Sep 2005 17:18:41 +0200
>     To: "'General Discussion: On-Topic and Off-Topic Posts'"	<cctalk at classiccmp.org>
>
>
>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) ...

Rev11 is available most commonly with RXV11/21 floppy boot and others
that exist for paper tape boot and maybe other disks.

It's not essential as a boot prom as most boots are small and uODT 
can be used to hand load them.

>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.

RTTY can also be done with a serial line card. The only thing
is baud rate setting (external switch) for multiple rates. If you 
can find a DLV11J (thats 4 serial ports on one dual width card) or
MXV11 (2 serial ports +ram +rom) that would save slots.

One thought, a M7270(KD-11F) OR M8186(KDF-11A) and M8047(mxv11)
will be a complete system on two dual width cards (cpu, 2 serial,
ram and eprom). It will need about 4A of +5 and under 1A of +12 power.

An alternate CPU is the falcon card M8063 (Kxt11 SBC11/21) which 
also has ram, Eprom, two serial lines and parallel io with a Qbus 
interface.  Common as can be but rarely seen as they are often 
embedded in larger systems (like a NC milling machine).

The above was typical of how LSI-11 series componenets were used in 
embedded systems.

The instruction set for PDP11 is more regular than 68k and very 
orthoginal CISC. Do read the various dec PDP-11 programming books
as it's a flexible machine and relocatable code is easy to do.



Allison