25 May
2007
25 May
'07
12:37 a.m.
Charles wrote:
I have found, by scoping the data lines in and out of
the laptop,
that the endless loop on the laptop is only an internal display
glitch - i.e. even though when I type characters they echo
endlessly on the screen until another key is pressed, only the one
(correct) character is sent to the PDP-11 at each keypress.
Similarly, when ODT sends a single "@", continuous "@@@@@@@..."
echoes on the display. Who knows why. It's annoying but apparently
does not affect the functioning of VTserver.
Check the ground line of your cable. I've seen plenty of
weird things caused by that.
Not sure if my output device command is correct
though. I'm trying
to write to my second RL02 drive (RL1: on the PDP-11/23+ with a
"1" key) and the only output device string that would work is
rl(0,1,0). The program does not explain the significance of the
(n,n,n) fields, although it does prompt for a string in that
format. It did display a confirmation each 100Kb, and did write
the entire 2.5 Mb file to the RL drive!
(controller, drive, partition) if I remember correctly
Although it's anyone's guess as to whether I
did this correctly.
When I put the pack in the RL02 attached to my 8/A and press Load,
the "Ready" light does not come on, which I believe means the
heads have not locked on the servo track. Which is strange because
even if I wrote to the wrong places on the disk, it still should
be able to sync up. AFAIK it is not possible to overwrite the
servo tracks by writing blocks to the disk through a controller
card? Or maybe the light is burnt out... or the pack I used is
bad...
I recall that some of the drives from DEC came in a 6-bit
version for the pdp-8, pdp-10, etc and an 8-bit version for the
pdp-11, vax, etc. Was the RL02 like this?
Please also explain to me the limitation for the size
of each
partition under OS/8 again? 2500 Kb is less than 2 Mw at 12 bits
p