27 Sep
2014
27 Sep
'14
1:28 a.m.
we take the same approach now and identified some bad memory locations
in page 0. I suspect more bad locations on page 1 as it is on the same
8k board assembly. we have not touched the extra 16kword board yet.
the problem is that bad locations read 0000: clear the ac... not handy.
we program around that by jumping a lot...
for now we outputted the data to a la120 at hand, as the serial console
board we use is configures for 110baud and we dont want to change that
for now.
Fortunately one of our members has a pdp8 emulator on his macbook pro,
so testing is kinda easy.
simon
On 27-09-14 06:30, Eric Smith wrote:
When we restored the PDP-1 at CHM, we were worried
that there might be
something useful in the memory that we would lose. We dumped the
first dozen or two locations manually, then toggled in a short program
I wrote to dump the remaining locations out serially via two of the
flags (one as a clock and one as data), and connected the flags via a
USB device (FTDI FT245, IIRC) to a laptop.
--
Met vriendelijke Groet,
Simon Claessen
drukknop.nl