Got the following stuff that need homes
Brand New in Box Apple Keyboard II with cable $20 dollars
BackPack 5.25inch Parallel Port Floppy Drive- Missing PSU, Requires 12V
HaBaDisk 800k Floppy Drive for Macintosh $20 dollars
Macintosh SE Logic Board with MacViking Video card- comes with all
cables and hardware to install into a Mac SE $40 dollars
Nice early 82 Apple IIe system with Monitor 2, 2 Matching Disk IIs,
Super Serial card and Microsoft Softcard Z80 Card $200
1 Early 83 Apple IIe, one broken key, works $25
1 Later //e Enhanced, Broken Delete Key otherwise works fine $25
I accept PayPal
Someone has claimed the entire batch.
Thank you much for all the responses.
1613 Water Street
Kerrville, TX 78028
(830)792-3400 phone (830)792-3404 fax
AOL IM elcpls
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Since I support the CBM crowd, I've had more than a few people send me
comments over the past few years, asking when I might consider offering
a replacement power supply for the home computing machines (VIC-20, 64,
Initially, I resisted for liability reasons and certification costs.
But, I decided earlier this year to put off those questions for a bit
and just see what might be technically and economically possible.
I've chased a few ultimately fruitless options, and I thought I'd see if
some fellow soul on this list might have some ideas.
Obviously, the first thought was a complete custom supply. My interest
was never in power design, so I am ill-equipped (and uncertain of my
abilities) to design such an item myself. Thus, I started looking for a
manufacturer that could design one.
5VDC at 4.3A.
9VAC at 9VA unregulated
To this I added my requirements:
The 5VDC be a switching PSU output
ISO C13 input power jack (so I can support many areas without building
custom power cords
115/230 switchable design (or two very similar designs that can handle
the 2 voltages)
My cost under USD$30.00 per unit.
Enclosed finished case, or be able to fit in a commonly available case
Someone put me in touch with Stontronics overseas, which worked on an
initial quote. But, I think the C13 and 115/230 requirements scared
I solicited information from Bear Power Supplies in the US, but they did
not seem too keen on continuing the discussion, so I have nothing from them.
I've also tried overseas suppliers, but I have not yielded fruit yet.
I've asked all the PSU suppliers on globalsources.com and alibaba.com
I have struggled to find a custom PSU manufacturer that can handle a
Being frustrated with the direct approach, I thought I'd try a different
path, and find a 9VAC or 5VDC single output power supply. I found a
single output large amperage 5VDC supply, but then I got stumped on
finding a way to synthesize a 9VAC isolated output from the 5VDC. A
simplistic approach would involve creating a harsh +-9V square wave, but
it needs to be at least .5A (to run the cassette deck on the 64/128),
and I worry that the noise on a square wave @ 1A would wreck the audio
and video noise level in the machine, which is not the best to start
with. Even ignoring that, I need to double or quadruple the voltage to
get the 18V rail to rail voltages I need.
On the 9VAC front, I had little luck finding a suitable 9VAC supply that
is 45VA or 63VA to support a 5VDC at 5A draw while leaving enough for the
5A 5VDC output. As well, I am not sure I am equipped to design a
switching 5V PSU from a 9VAC source.
With the old power bricks getting more brittle and prone to failure each
day, I feel some sense of urgency to find some solution for folks.
For liability reasons and because 5VDC is the more important voltage in
the units, I myself lean towards a small box that turns 5VDC into 5VDC
and 9VAC, but designing a voltage doubler/sine wave generator/isolation
transformer solution is far beyond my comfort zone. If this is not a
complicated task, I am wondering if someone on-list is up for a small
freelancing effort to design such a unit. It needs to contend with the
issues outlined in this PDF (http://www.ide64.org/power_des.pdf) in that
the noted design won't work as is since I think people need to be free
to use the power switch on their machine.
There might not be a reasonable solution, but I thought I'd share in
case I am missing an option.
brain at jbrain.comwww.jbrain.com