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The logic doesn't seem to be in PIP10; PIP10 uses the DCB devtype
field to decide if it has a DECtape, and if so, which controller.<br>
<br>
See <a
href="ftp://sunsite.unc.edu/pub/academic/computer-science/history/pdp-8/os8/os8.v3d/sources/system/dectapes/dectape7/pip10.pa">ftp://sunsite.unc.edu/pub/academic/computer-science/history/pdp-8/os8/os8.v3d/sources/system/dectapes/dectape7/pip10.pa</a>
for PIP10, and table 33 in<a
href="http://www.grc.com/pdp-8/docs/OS8_System_Reference_Manual.pdf">
http://www.grc.com/pdp-8/docs/OS8_System_Reference_Manual.pdf </a>for
the DCB breakdown. I'm not an OS8 expert, but I think the DCB is
setup by CONFIG.<br>
<br>
Relevant snippets:<br>
<br>
DCB=7760 /DEVICE CONTROL BLOCK (FIELD 1)
<br>
<br>
DVTYPE, 0 /DEVICE TYPE HOLDER
<br>
<br>
JMS GTDVTP /COMPARE DCB ENTRY WITH TC08 OR TD8E <br>
SZA CLA <br>
JMP CDIN3 /NOT DECTAPE
<br>
<br>
GTDVTP, 0 <br>
TAD (DCB-1 <br>
DCA TEMP1 <br>
CDF 10 <br>
TAD I TEMP1 /GET DCB ENTRY <br>
CDF <br>
DCA DVTYPE <br>
TAD DVTYPE <br>
AND (770 <br>
TAD (-210 <br>
SZA <br>
TAD (30 <br>
JMP I GTDVTP
<br>
<br>
<br>
<br>
<pre class="moz-signature" cols="72">This communication may not represent my employer's views,
if any, on the matters discussed. </pre>
On 20-Mar-13 18:05, Bob Supnik wrote:<br>
</div>
<blockquote cite="mid:514A3298.5010508@supnik.org" type="cite">I
tried running PIP10 from the image Ian was using.
<br>
<br>
If the simulator is configured for a TC08, it hangs. It is in a
loop doing IOT 773/JMP .-1, which is a TD8E IOT.
<br>
<br>
If the simulator is configured for a TD8E, it returns an error. I
tried DTA0:/Z and got OUTPUT FILE OPEN ERROR.
<br>
<br>
So the first issue is that PIP10's logic for telling which DECtape
controller is present uses some feature that the simulator is
doing incorrectly.
<br>
<br>
The second issue is what happens beyond that point.
<br>
<br>
/Bob
<br>
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