11/23 confusion, was Re: [HECnet] RSTS/E is really picky

[Dave McGuire]

On 05/20/2014 11:40 AM, Johnny Billquist wrote:
My memory board is third-party.   Looks like it's truncating my memory
then. ;)

Are you sure. Very few 11/23 systems actually exist. Most people
really have 11/23+ systems, even if they are not aware of it.

It's a dual-height board.   I don't think it /can/ be an 11/23+!

Doh! So you actually have a KDF11-AA (M8186). That sucks. I'm not sure
if those were ever upgraded to 22-bit addressing, or if you need the
KDF11-BA (M8189) for that.
Oh well, so you might actually be stuck with 11M then.

  Ah, no.   Nearly all dual-wide 11/23 CPUs (KDF11-AA, M8186) support
22-bit addressing.   Etch revs A and B did not, but in practice there are
very few of these out in the field.   I have had probably a hundred
KDF11-AA boards go through my hands over the years, and have easily
thirty of them now, and have never seen a Rev A or Rev B board, nor have
I ever known anyone who has.

                                  -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA