On Thu, 25 Jan 2001, James Lothian wrote:

> Johnny Billquist wrote:
> > > Erm, the 750 has a 14Mb limit. And most 750s were 8Mb. I know it's not a
> > > microvax, but it's still a vaxentoy, at least as far as I'm concerned!
> > 
> > Actually, the limit is 22 MB, but that requires another memory controller,
> > which is less common...
> Er, no, sorry, the physical address bus is only 24 bits, which allows up
> to 16
> megs of address space. The top 2 megs are occupied by unibus/massbus
> adapters, WCS
> &c. The memory controllers were:
> L0011 - up to 8 * 1/4 meg memory arrays
> L0016 - up to 8 * 1 meg (most common)
> L0022 - up to 2 * 4 meg + 6 * 1 meg
> 
> Maybe you're confusing the module number and the capacity? 14 megs is
> definitely the limit. 

*Sigh* Here I go again.
Writing from a bad memory. You're absolutely correct. For some reason I
suddenly just imagined that it was 22, using 2*8 + 6*1, but I stand
corrected.

	Johnny

Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt@update.uu.se           ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol