Heathkit H-11 restoration questions

From: Allison J Parent <allisonp_at_world.std.com>
Date: Mon Oct 4 22:31:11 1999

<> The M8189 was available as two basic versions 11/23 and the plus. The
<> primary difference was what it could boot.
<
<I don't think Alison means 11/23 and 11/23plus; the 11/23 uses a
<dual-height M8186 (KDF11-A) board. But the M8189 was used in both
<11/23plus (BA11-N box, IIRC) and microPDP11/23 (BA23 box). The difference
<was just the boot ROMs, as she said.

No I meant what I said.

 M8186 KDF-11A 11/23 No serial or boot/diag roms
   Depending on rev either 18bit or 22bit (if no MMU then 16bit)

 M8189 KDF-11BA 11/23B serial + boot diag roms. No MSCP boot.
 M8189 KDF-11BB 11/23+ Same board different boot roms. Boots MSCP
   Both are Q22 though early versions were packaged as Q18

I have multiple copies of all three plus 11/2 (KD-11-H M7270) and 11/03
(KD-11, M7264). My 11/73 is the M8190.


Allison
Received on Mon Oct 04 1999 - 22:31:11 BST