Blinker/Turn relay TBB44 schematic and lt-spice model
I have one of these in my old BMW R75/6 motorcycle. As I once had a
short to chassis on one of the cables from the relay to the lamps the
relay stopped working. After resoldering the (internal) relay and
fixed with the contacs, the relay worked, sort of. The indicator lamp
did only blink once or twice and then nothig. As I could not find any
schematic or spare parts on the net, i decided to do some reverse
The 0.033 Ohm resistor in the schematic is actually a metal bridge
going from the relay to the center connector to the right,
see component-side. This metal
bridge had become very hot and probably changed resistance, I do not
know what the resistance was before the incident, so 0.033 Ohm is
after. Anyhow by parallel connection of a suitable resistor Rtest with
R10 (10 Ohm) the indicator lamp worked again. Note this resistor shall
be selected so that the indicator stops blinking if one of the blinker
lamps gets broken, if a too low value is used then this won't work.
Autostart for ATX computers that not support start at power on in BIOS
If you want to use an ATX computer for a firewall or fileserver or
something else that you want to autostart after a power failure and the
BIOS for the machine does not support that... what to do?
Here is a
small hardware patch using a c-mos 555 circuit that can fix that:
Locate the +5V standby and a ground from the ATX power supply
and tap in to those. Next you need to locate the wire to the
power-button and tap into that. Then you should be all set.
The only drawback i know with this solution is that if the power
outage is so short that the +5V standby does not disappear, then this
circuit will not be able to start the machine.
Stackpointer - Datorföreningen Stackens organ
Gamla inscannade nummer + lite annat finns här.
The StackPointer article about PDI/2 from 1988.
A short .pdf presentation of microprocessors in servotechnology (in swedish).
Jörgen Städje writes about PDI in
english, far down.
The SAFA site is here.
Patched firmware 1.0q for the Yamaha CRW 2260
If you have modified your CRW 2260 to 4260 (4x) and want the
latest firmware you have it
If you have not (yet) done that, look here for an instruction on how to do it.
The PDP11-emulator is here:
A sligthly modified version of Bob Supniks PDP11-emulator:
Connect to ELVIRA
port 4000, login as user: 99,99 password=user
Operating system is RSTS/E V 8.0. The emulator is running on a AMD K6 300,
the it is slithly faster than a real PDP11/73.
NOTE: disconnect is a bit slow after logout.
The ELVIRA homepage (some more stuff)
INIT.SYS Y2K patches to RSTS/E V8.0 and 9.2:
To allow RSTS/E to boot to a date after 31-dec-99 use this for
V8.0-07 and forV9.2-10 with $ONLPAT.
Problems with SLOW RTL8029 based ethernet card?
Look here, it might help.