Re: Apple II Memory Expansion Card

["Warren Ernst" <wernst@gmail.com>]

I didn't bother to mention the RamCharger because the original poster
as the genuine Apple-Built Slinky card, which lacks a power plug.

That said, it was my dream in 1989 to own a RamCharger, but I seem to
recall that it was $200 or more (and I was making $7 a hour, 20 hours a
week back then), and the battery looked just like a Disk ][ drive,
complete with a black face. I had a DuoDisk stack.

I am somewhat ashamed to admit that the thought never crossed my mind
to get a "normal" power supply to apply voltage to the RamFactor power
socket. A wall-wart may be just the ticket - I'd still lose the
contents when the power failed (unless I plugged the wall-wart into a
UPS, hmmmm), but at least the contents would remain over time...

I still have my original RamFactor manual. I'll check it out and see if
there are specs for the power plug this weekend.

-Warr


David Wilson wrote:
> mdj wrote:
> > Michael J. Mahon wrote:
> > > So the board contains its own refresh clock?  (Which it would have to
> > > switch to the Apple clock when operating, to avoid asynchronous messes.)
> >
> > I'd bet no, and there's a clock generator in the RamCharger unit. I
> > can't think why else it would need 4 pins on the connector - you only
> > need a 5v source to power the Ram chips
>
> I have a RamFactor in my hands and it has two jumpers joining pins 1-2
> and 3-4 on the 4 pin connector. As two of the pins must be +5V and GND
> I cannot see how either of the other pins could be clocks.