TD Systems TDL-11 QBUS (SCSI?) card

Glen Slick glen.slick at
Sat May 2 21:41:02 CDT 2015

On May 2, 2015 7:17 PM, "Seth Morabito" <lists at> wrote:
> Hi folks,
> I was recently given a load of QBUS stuff, and among the cards is a TD
> Systems TDL-11. I can't find a scrap of information about it anywhere.
> I have reason to believe it's a SCSI controller that emulates RL01
> drives, based on its similarity to the TDL-12, which is documented
> online here:

Do you have access to an EPROM programmer? Before someone turned up the
manual for the TDL-12 I found enough clues to figure out how to start the
onboard DMON configuration utility be examining the contents of the EPROM.
A dump of the EPROM should also show whether or not there is even an
onboard configuration utility.

Are the major ICs a Z-80 CPU, plus a couple of 8255s instead of a more
typical NCR 5380 SCSI controller?

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