Heathkit H-11 restoration questions

From: allisonp_at_world.std.com <(allisonp_at_world.std.com)>
Date: Mon Oct 4 15:35:00 1999

> I was assuming a sinusoidal AB-AB chain starting from the slots labelled
> "A" and "B" (out of A, B, C, and D). Now... the one twist is that the cards
> are installed with the CPU facing the bottom of the cage (solder side up),
> but the keys on the backplane connectors are a dead giveaway.

Heath backplane is serpentine AB only.

> > Yes, also DLV11 or the heath serial card both should have HALT on BREAK
> > enabled. <both support it as do the 11/03>
>
> I didn't even try that. For now, because of bootstrap considerations, I'm
> running with an 11/23plus CPU and a VT-220 (because it's close).

VT220 supports break generation and all.

> Speaking of bootstraps, what did the H-11 come with stock? BDV-11? Custom
> Heath board?

No BDV11, that was a dec card. I remember a hand entered ODT boot. You
could use a BDV11 or TEV11. The last time I used a real H11 running H27
and HT11 was 1981.

Allison
Received on Mon Oct 04 1999 - 15:35:00 BST