Heathkit H-11 restoration questions

From: Chuck McManis <cmcmanis_at_mcmanis.com>
Date: Mon Oct 4 12:19:42 1999

Zane and Allison have been chatting, figured I'd chime in....

At 09:45 AM 10/4/99 -0700, Ethan Dicks wrote:
>OK. I'll go back to the card and get it [floppy] working.

This is ideal since the Heath Floppy drives can format RX01 media whereas
the DEC drives will not.

>> Get manuals for it! you'll save pain.
>Any pointers on where to lay hands on H-11 docs?

I've got some, contact me off list and we'll make some arrangement.

>> The H11:
>>
>> DEC M7294 11/03 (Quad width card with 4k ram on board)
>
>Got it.

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.

I believe that without modification the Heath backplane is a _16 bit_
backplane. (as opposed to the default 18 bit on most LSI 11 machines). I
know that I was unsuccessful getting anything other than the 11/03 cards
running in it.

>The card itself is about as simple as any Qbus card. It is, I take it,
>supposed to be nominally RXV11 compatible from a driver standpoint, yes?
Received on Mon Oct 04 1999 - 12:19:42 BST