From: Jeff Hellige <jhellige(a)earthlink.net>
>other boards are long gone. I have to make a minor solder repair to
>the powerboard for the floppy still, but after that I'll be trying to
>boot CP/M 1.30 from Lifeboat Associates from a North Star disk
>system. Now that my move is almost here, I can start thinking about
>working on this machine again.
>
> Jeff
Ah, you may need more memory for that. The Lifeboat NS* dist for 1.4
needs 4k more, they sorta grafted the NS* dos to the BIOS as disk
drivers so it's a bit fat. I bought the 1.4 copy way back when (it was
new release then).
Assuming its for a NS* Horizon it will be personalized for the default
NS*
IO addresses. HOWEVER... it was also distributed without IO
personalization. You will need NS* dos and one of the monitors or do
it from the front pannel. I know I did that using the first machine
(altair)
before I moved to a real NS* horizon. DOCs for that version are a must
or hope there is a readable example on disk.
Allison
From: Dwight Elvey <elvey(a)hal.com>
>Hi
> It should also be noted that here in the US, any jamming
>of a lawful receiver is considered against federal law.
>Dwight
Dont bet on this. Read part 15 carefully. depending on the service
and all it may not only be permitted it may be a case of the reciever
(or its owner) has to live or deal with it by adjusting their end of the
problem. What you say USED to be absolutly true, then the last 20
years of radio pollution forced the FCC out of the RFI management
business.
Allison
From: Jeff Hellige <jhellige(a)earthlink.net>
> What is the least amount of memory that CP/M 1.3 will run in?
>--
The standard distribution sized for memory as:
1.3 16k
1.4 16k
2.0 20k
2.2 20k
This was the expected memeory for the startup of a distribution disk
as it was "sysgened" for that size. It left enough space in all cases
to run sysgen(or movcpm) and leave an images in the available TPA.
The actual memory needed, using the standard SSSD 8" distibution of
2.0/2.2 was 2k for the CCP (when loaded), 3584 byts for the BDOS
and about 1k to 1500bytes for the BIOS. The 1.3 version was only
slightly smaller.
Allison
My latest bright idea, an 8x10 net (maybe 10x12) to hang from the garage
ceiling to hold all my big empty boxes, bags of filler, etc. (a good
portion of my garage has a 14' ceiling, so I have a lot of "room" even
above head height. I'm am not entirely sure what one end will be anchored
to, but I am so jazzed at the thought, that most likely I will run out
first thing in the morning and buy and put up the net (anything netlike
should be fine). Lets just say that right now my empty box and foam
collection takes up about one 8x10 rooms worth of my garage and house.
-----Original Message-----
>It might be added here that I very much enjoy something called ARDF
(Amateur
>Radio Direction Finding.) The same techniques can be used to find such
>devices rather easily :).
I had one that defied that somewhat. Used two antennas with diversty
mode
switching (both location and polarization). It was a favorite pastime.
Allison
From: Dwight Elvey <elvey(a)hal.com>
> I saw an article that showed that one could put
>two junction fets together in such a manner that
>it made a negative resistance curve like a tunnel
>diode. I did this and made a FM jammer. It used:
Over the years I've used...
UV201 (old valve)
6c4 (no nearly so old valve)
2n170 (ge transistor FT about 30mhz)
real tunnel diode (1n3117)
hand picked diode with transistor (basic osc and comb generator)
(generates uniform level rf carrier every 500khz through ~100mhz)
Zener with 60db gain centered at 100mhz (very white noise!)
My favorite 2n706 (Si NPN computer transistor) WIDE FM modulated with
White noise source (zener followed with gain).
pseudo random digial word driving PLL
(every frequency possible on 50khz centers for an octave,
100-200mhz)
>I would think that a standard oscillator could be
>done with less transistors but it would require more
not many, One fet, cap, coil, bypass cap, battery.
>of this was on FM. A few blanked out signals would eventually
>cause the person listening to hunt for another channel.
>FM goes completely quite when jammed, unlike AM that squeals.
AM squeals are avoided by being exactly on freq and holding that. ;)
Allison
From: Don Maslin <donm(a)cts.com>
>On Sun, 29 Oct 2000, Jeff Hellige wrote:
>
>> What is the least amount of memory that CP/M 1.3 will run in?
>
>Well, I am not at all certain about 1.3, but I have a DRI distribution
>disk for 2.2 that is set up for 20k.
Don, 1.3 and 1.4 were built as 16k for the distribution disks.
Allison
Regarding cargo nets attached to the garage ceiling.
I also thought of the same idea, but an interesting occurrence has made me
cautious. I have several articles attached to my garage ceiling, mainly
sail boat parts and one had a rope release hanging on it. The dangling rope
release wrapped around the front bar on the car-top carrier on my wife's
van, which pulled the article off the ceiling, my wife now has a cracked
windshield on the van. I have now shortened the release and taped all loose
ends together. It also made me worry about some item falling onto the car
if the attachment screws pulled out.
I now worry less because all of the stuff is now above my car!!
Mike
mmcfadden(a)cmh.edu
