On Tue, 21 Jun 2005 Paul Koning <pkoning at equallogic.com> wrote:
> >>>>> "Johnny" == Johnny Billquist <bqt at Update.UU.SE> writes:
>
> Johnny> Mentec implemented one additional instruction that really is
> Johnny> useful, and which atleast RSX will use, if it finds it, and
> Johnny> that is a block copy instruction. I don't even know if it has
> Johnny> a mnemonic. Moving large chunks of memory is something the
> Johnny> systems does a lot in I/O, so that really helps if it can be
> Johnny> done faster.
>
> Is that just the MOVC instruction (part of the CIS optional set) or
> something else? If CIS is present, RSTS will use MOVC for block move
> automatically.
No, it's not the MOVC, but the MOVC would probably also be acceptable.
RSX have a macro to define the instruction, called MOVR$
It takes three arguments, in the form of three registers. The opcode is
075abc
a is source
b is destination
c is length
all as registers. It copies the data according to this.
RSX detects wether this instruction exists at boot time, and patches the
system if it does, to take advantage of it.
Johnny
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at update.uu.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
On Tue, 21 Jun 2005 Paul Koning <pkoning at equallogic.com> wrote:
> >>>>> "Tony" == Tony Duell <ard at p850ug1.demon.co.uk> writes:
>
> Tony> I suppose you could include the Pro 325 and 350 (no I/D, F11
> Tony> chip) and the Pro 380 (split I/D, J11 chip). But those will not
> Tony> run normal PDP11 software, the I/O is totally different I
> Tony> believe.
>
> It certainly is -- different and very badly conceived. But then
> again, Unibus and Q-bus are also different (though not by the same
> magnitude). A number of OSs run on PROs -- RT, Unix, P/OS, perhaps
> stock RSX as well. And the RSTS standalone initialization module will
> boot on a PRO in V9.6, though OS support for it was never released...
No, stock RSX will not run. But P/OS is more or less built from the same
sources. There are some conditional stuff in the RSX sources for P/OS, and
then you need device drivers...
So yes, the PRO is different. Same CPU architecture, different I/O
architecture. The Q-bus is actually similar enough to Unibus that many
devices look same enough to share code between the buses.
A few things differ, but few enough that you can conditionalize them, or
even in some cases, let the OS hide that difference.
Johnny
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at update.uu.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
>From: "Joe R." <rigdonj at cfl.rr.com>
>
>At 09:48 AM 6/21/05 -0700, you wrote:
>>>From: "Tom Jennings" <tomj at wps.com>
>>>
>>>On Fri, 17 Jun 2005, Eric Smith wrote:
>>>
>>>> Tom wrote:
>>>>> Just a quick note on why I've been silent on my DG Nova 4, LGP-21,
>>>>> etc all summer...
>>>>
>>>> Since you're not in the southern hemisphere, I'm not sure what you
>>>> mean. Summer doesn't start here in the northern hemisphere for
>>>> another few days yet.
>>>
>>>Summer is when it's warm, winter when it's cold and/or rains.
>>>Those are the only two recognizable seasons in Los Angeles.
>>
>>Hi
>> I spent 4 years in Florida and they have two seasons there
>>but I'm not sure what you'd call them. During the normal winter
>>months, it is hot and muggy. During what we call the summer
>>months, it is hotter and muggier.
>>Dwight
>
> Winter = Warm and muggy
> Spring = HOT and sweltering
> Summer = Alternates between dowsings with scolding rain and solar inferno!
> Fall = only four more months of summer!
> yes four months, winter is only about 1 1/2 months long here!
>
> Joe
Yes, Joe. That is close to what I remember :)
In Florida, when they say there is a 50% chance of rain,
they mean that 50% of the people will be rained on.
It doesn't have the same meaning as elsewhere.
Dwight
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>From: "Tom Jennings" <tomj at wps.com>
>
>On Fri, 17 Jun 2005, Eric Smith wrote:
>
>> Tom wrote:
>>> Just a quick note on why I've been silent on my DG Nova 4, LGP-21,
>>> etc all summer...
>>
>> Since you're not in the southern hemisphere, I'm not sure what you
>> mean. Summer doesn't start here in the northern hemisphere for
>> another few days yet.
>
>Summer is when it's warm, winter when it's cold and/or rains.
>Those are the only two recognizable seasons in Los Angeles.
Hi
I spent 4 years in Florida and they have two seasons there
but I'm not sure what you'd call them. During the normal winter
months, it is hot and muggy. During what we call the summer
months, it is hotter and muggier.
Dwight
