6 Sep
2014
6 Sep
'14
1:27 p.m.
On 9/6/2014 1:06 AM, Brent Hilpert wrote:
On 2014-Sep-06, at 12:53 AM, Brent Hilpert wrote:
Thanks for all the info -- the core memory overview you put together
looks to be very helpful, and when I have some time (hopefully this
evening) I'll study it a bit more in-depth and see what diagnosis I can
apply to the 11.
Thanks,
Josh
On 2014-Sep-05, at 9:11 PM, Josh Dersch wrote:
Should have mentioned.. it could be a
64*64 matrix with anti-coincidence addressing to further double it.
Basic testing (via the simple address test listed
here: http://www.psych.usyd.edu.au/pdp-11/hints.html) reveals that most of the 8KW of core
(H215) and controller is working pretty well, except for a 128 byte range between
012000(8) and 012200(8). Within this range, all words read back as all zeros regardless
of what is written.
For 8K the most probable matrix size is 128 * 64 (binary pair
closest to the square root of the size).