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

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