Heathkit H-11 restoration questions

From: allisonp_at_world.std.com <(allisonp_at_world.std.com)>
Date: Mon Oct 4 13:07:43 1999

> The most common "upgrade" was to replace this card with a two card set of
> the 11/03 (M7270?) and the M8044-Dx 64KB card.

Yes it was or in a later time frame m8186 (kdf11, 11/23) with m8044s. that
workes better than 11/23+ (m8189) as it was a dual solution and the hath
backplane was rather cramped.

> know that I was unsuccessful getting anything other than the 11/03 cards
> running in it.

Other cpus have been run in it namely 11/2 and 11/23 (m8186). You need to
jumper the a16-a21 lines for 18/Q22 and you cannot mix some of the old
non-BBS7 selected IO. The 11/03 used a few of those lines for other
purposes and mixing some of the older cards and newer ones could conflict.

Allison
Received on Mon Oct 04 1999 - 13:07:43 BST