Ethan Dicks via cctalk wrote:
  On Thu, Sep 23, 2021 at 6:41 PM Jonathan Stone via
cctalk
 <cctalk at classiccmp.org> wrote:
  I've read that there is circuitry in the
expansion base (BA40A?) has circuitry .  Does anyone know what the circuitry does?  Is it
required for SCSI operation?  (I hope not, or I'll have to kludge one up to make use
of pk2k SCSI boot-roms!) 
 IIRC the DHT32 has a small board in the skirt and the
external RD
 interface may have a board as well.  SCSI (for a TK50Z-FA, originally)
 is just a cable.  The 50-pin connector on the mainboard is correctly
 wired for SCSI. It may well have TERMPWR active and not
 current-limited though, if it matters to your target.
 -ethan
 
Indeed, Ethan.? TERMPWR is active.? I actually have two 1GB disks inside
mine (I do not
have an expansion box), and I kludged? a centronix? SCSI connector in
the back to connect
external stuff.
By the way, if anybody needs the four patched rom images, I can share
them off-list.
carlos.