Were all of the packs written on systems with the same word length? If come
were written on a PDP8-A, You might get garbage reading them on a PDP11.
On Mon, Mar 30, 2015 at 12:47 AM, Christopher Parish <
christopher.parish at parishcomputers.com> wrote:
I've gotten my RL-02 -> USB Mass Storage
controller mostly working with a
few residual gremlins. Specifically, I've noticed from my testing that I
have good packs, ones that read out almost the same every time, and bad
packs, ones where half the bits seem to be in different states every time I
read them. I've left write support untested until I can solve this problem.
Right now, my working theory is that different controllers had slightly
different timing characteristics, and I may need to adjust more of my DPLL
parameters dynamically to deal with that (something I'd rather avoid). Of
course, most of these packs haven't been put into a drive since the
mid-80s, and there could be some bit rot going on.
As many of you have much more experience dealing with these drives than I
do, my questions are:
- What type of long term reliability have people noticed from their RL02K
- Is garbage data sometimes normal for certain packs until they are
rewritten with ?fresh? data?
- Has anyone noticed pack compatibility problems between various