On 5/26/2013 3:25 AM, Timothe Litt wrote:
Second: The Map_WriteW routine (in pdp10_ksio.c) is preserving bits 0,1,
18 & 19, but this is a 16-bit device. The real UBA would clear them in
this case. This is a bug in simh.
...but not unconditionally, right?
The KS10 needs to do 18-bit IO for the disk interfaces. The UBA bridge
can be configured to do 18-bit IO or 16-bit IO.
See DISABLE bit in the UBA paging RAM in the technical spec that you
referenced on page 5-105.
(I didn't look to see if that was implemented correctly in SIMH)
Rob Doyle
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