At 09:40 AM 3/26/2010, Armistead, Jason wrote:
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According to
http://simh.trailing-edge.com/vax.html
and
http://simh.trailing-edge.com/pdp11.html
Both mention the RA73, which is a 2Gb drive (that Id really love to use with SIMH !)
I am trying to run the MicroVAX 3900 flavor of SIMH, but when I try to put SET RQ2 RA73 in my VAX.INI file I get an error
parameter
vax.ini> set rq2 ra73
Non-existent parameter
And I end up with a 159 Mb RD54 drive instead when I boot VMS and do a SHOW DEVICE DUA2: /FULL
According to both the VAX and PDP11 pages on the SIMH site, the RA73 is listed as supported, but when I dig into the SIMH source code and look at PDP11_RQ.C, in the it has an X next to it which means not implemented.
Whats this all mean ?
Is it just a documentation bug, and those web pages shouldnt mention RA73s ?
Is there a technical/software reason why SIMH doesnt support these drives ?
Is no-one able to fill in the question marks in the RCT column of the table in PDP11_RQ.C which also has blanks for RD32, RD33 and RA70 drives ? I managed to figure out that RCT stands for replacement and caching table (a reference in the VMS I/O Users Reference Manual to DEV$M_RCT). We ought to strive to improve the comments in the code to expand this (I found no
On a side-note, the PDP11 web page shows the capacities of these drives as a range. The VAX page lists the capacities as 12KB for VAX 780 and 200-1960MB for VAX 3900. The 12KB entry for VAX 780 seems like a typo perhaps.
Regards,
Jason
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