[Simh] KS10 and the DMR

[simh at swabhawat.com]

When trying to make the combination Simh KS10 work with the DMR synchronous
line interface on Tops10-704; some peculiarities are encountered. 

Has anyone at the time seen this combination effectively work on the real
hardware? 
The driver for DMR is D8RINT.MAC in UNSMON and is created for Tops10-702 by
Timothe Litt and he stated in the documentation that performance had been
checked in relation to the standard supported Kdp/Dup combination, so
something must have worked at the time, whether within Dec laboratory or in
the real world with some special customers. 

However by EDDT debugging the monitor 704, it is now clear that with the
current releases of D8RINT and Tops10-704 it is impossible to function
because of at least 2 errors in de code; one in D8RINT itself which on
itself can be easily repaired, but leads to another second error found in
SYSINI in Tops10; the relative location in SYSINI and possibly the form of
the DMRONC routine creates race conditions on establishing the unibus map in
the DMR control block leading to stopcode UBA. 

Does anyone know of later releases of D8RINT and or what the last working
combination was. The errors found - thus far - have nothing to do with the
hardware interaction itself or Simh emulation of it proper; it is pure
Tops10 bebaviour. 

Best regards 

Volledige inhoud weergeven 

 

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