24 May
2005
24 May
'05
10:04 a.m.
RE: PDP 11/45 light chaser
>>>> "Gooijen" == Gooijen H
<Gooijen> writes:
Gooijen> The drawback of the light chaser program that uses the RESET
Gooijen> instruction is that the heads load and unload of the RX02
Gooijen> drive in my PDP-11/40. That clunck-clunck sound is not
Gooijen> pretty for a longer while ...
So start up the KW11L clock, point its vector to an
RTI, and use a
WAIT instead of a RESET...
paul
Hmm, I thought that the RESET instruction provides the ~100 ms delay
so that the lights are visible (on the 11/35 they are LEDs anyway)
but this instruction also asserts the RESET/ (BUS INIT-L ?) signal.
That is what makes the RX drive clunk - at least that's what I thought.
- Henk, PA8PDP.