[Info-vax] OpenVMS.Org quick pool

[Johnny Billquist]

On 2012-08-24 18:32, Johnny Billquist wrote:
> On 2012-08-24 17:56, Stephen Hoffman wrote:
>> On 2012-08-24 14:43:55 +0000, Johnny Billquist said:
>>
>>> On 2012-08-24 14:48, Stephen Hoffman wrote:
>>>> On 2012-08-24 02:58:03 +0000, Johnny Billquist said:
>>>>
>>>>> Oh. I should probably point out that "22-bit address" is the physical
>>>>> addressing of the machine. Virtual addresses are always 16 bits, even
>>>>> on modern machines with 22-bit physical addresses.
>>>>
>>>> So you don't know how to or haven't had to program a PDP-11 box past
>>>> 16-bit addressing, or another analogous use of (lowercase-W) windows?
>>>> Ok.
>>>
>>> Huh? Are you saying that I'm wrong... I am not.
>>
>> What you're reading in the PDP-11 manuals is correct, as far as it
>> goes.  A PDP-11 does have 16-bit addressing.
>
> A *virtual* address on a PDP-11 is *always* 16 bits. It cannot be
> anything else. No matter which model, which features you turn on, nor
> which kind of other tricks you think you came up with.

This is actually just the same as on a VAX, where a *virtual* address is 
always 32 bits, even though a physical address is either 30 bits, or 34 
bits, depending on the CPU, and a setting in a register.

I would assume you feel way more comfortable with the VAX, Hoff?

	Johnny