10 Apr
2015
10 Apr
'15
2:20 p.m.
On 2015-Apr-10, at 12:29 PM, Brent Hilpert wrote:
On 2015-Apr-10, at 9:32 AM, geneb wrote:
This 1969 PDP-14 manual from bitsavers indeed describes a core rope ROM implementation for
the control memory:
http://bitsavers.trailing-edge.com/pdf/dec/pdp14/DEC-14-GGZA-D_PDP14UM_Nov6…
It indicates the initial programming was generally done by specification to the DEC
factory, but in-the-field reprogramming was also done.
On Fri, 10 Apr 2015, William Donzelli wrote:
Core RAM and "core rope" ROM sure are often confused, but technically I would
disagree that they are similar.
. . . .
Strikes me as conceivable that DEC used a field-configurable core rope design for the
PDP-14 program memory - something like the PDP-9 module that Mattis linked to could be
field alterable, but it sounds like "joe" in the OP thread may be confusing
things. You should probably cut him a little slack, since
core and rope are
easily confused, as they are so similar. Rope could be rewired in the
field, but I certainly would not want to be the FE with that job.
Yeah. I think I'm just going to walk away from it. :)