TD Systems TDL-11 QBUS (SCSI?) card

Seth Morabito lists at
Mon May 4 11:56:49 CDT 2015

Well now I have egg on my face...

* On Mon, May 04, 2015 at 01:05:44AM -0500, Seth Morabito <lists at> wrote:
> Drat, it doesn't seem to work. Here's the procedure I tried:
> 1. Halt the CPU and enter ODT
> 2. 17774400/000201 400
> 3. Set halt button back to Run
> 4. Examine 1000 and up... nothing there but 000000's and 177777's

No, actually it DOES work. As is often the case in these situations,
the failure was human error. I miscounted my QBUS slots and had this
in the A&B slots of row 5 of the backplane, with nothing in C&D -- no
DMA grant continuity! I switched it to C&D of row 5, and now it works:

@ 17774400/000201 400
@ 1000g
IAX 3.2 (C) 1984 TD Systems
 B  Boot
 C  Configuration
 D  Display
 E  Exercise
 F  Format
 S  SCSI Cmd
 T  Test TDL
 W  Write BSF

Now getting it to talk to my SCSI ZIP disk will be another exercise
entirely. So far it's not working, but I anticipate human error there
as well.


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