6 Apr
2013
6 Apr
'13
3:14 p.m.
On Apr 6, 2013, at 17:07, Dave McGuire <mcguire at neurotica.com> wrote:
On 04/06/2013 01:59 PM, David Riley wrote:
Oh yes, I didn't mean to imply otherwise. Very few
extant KDF-11s are 18-bit. All I meant to say was that I
wasn't 100% sure what the distinguishing feature for
the "plus" in the 11/23+ was, but I'm pretty sure it was
one of those two. Most likely the KDF11-B.
- Dave
I wouldn't swear to the fact that there
weren't 11/23s sold as 18-bit
systems; my fuzzy memory says that 11/23 might have been 18-bit while
11/23+ would have been 22-bit. Other people doubtless know better
than me; my other recollection is that the "plus" distinction has to
do with the KDF11-B board (which has the boot ROM and SLUs).
Nearly all KDF11-A boards (the dual-wide version) actually do support
22-bit addressing. I believe it was etch rev "C" that added 22-bit support.
I've had many KDF11s over the years; I don't think I've seen any of the
non-22-bit-capable ones.