Hi,
My restoration project continues, after fixing power supply and some
issues with the DKC8A (Option #1) the machine now passes the CPU test
and the memory test (machine is now equipped 32k core). The setup of
the machine is minimal:
- PDP8A CPU, KK8A, M8315
- Option #2, KM8A, M8317
- Option #1, DKC8A, M8316
- Core memory DATARAM Corp. 16k*12 (field 4-7)
- MM8AB, 16k core (field 0-3)
So I started on the RL01 drives. Since I never had used those, I don't
now how they should work. I'm learning those things from the manuals...
So I put in the RL8A disk controller (M8433) and connected the cable
to one of the drives at a time. Also connected the terminator on the
drive.
The first drive that I tested turned on the "READY" light, then
nothing more happened. I was able to open the drive immediately.
The other drive that I tested turned on the "READY" and the "FAULT"
light, then nothing more happened. I was able to open the drive
immediately. I opened this drive up (unscrewed the lid) and noticed
that the spindle motor rotated slowly for 10 seconds when i powered up
the drive with a cartridge in it. I also measured the voltage on the
power lines and got this:
5V: 5,1V
8V: 7,7V
-8V: -7,9V
Ureg: 15,5V
-Unreg: -15,2V
Which should be fine according to the "Rl01/Rl02 Technical Manual,
Volume 11-Service Procedures"
What I have read in the manuals is that the drives should behave like this:
1. Power on, no lights should come on.
2. After a while the load light should illuminate. Now it should be
possible to open the lid and load a cartridge (and place the
protection on the top).
3. Close the lid and press "LOAD". Load should now go out.
4. The drive should spin up and read the servo data. When done the
"READY" should illuminate.
How much of this depends on a working controller (RL8A)?
For a start i would like to run the controller diskless controller
test, AJRLAAO. Then the AJRLBAO/AJRLCAO drive test. I have searched
the net after those but haven't found any sources. I wander if anybody
have those and the documents on them?
Then what else should I do?
/Anders