Re: interesting schematic site

["Bill Garber" <willy46pa@comcast.net>]

"Michael J. Mahon" <mjmahon@aol.com> wrote in message
k_idnTmsP9VcAcrfRVn-2Q@comcast.com">news:k_idnTmsP9VcAcrfRVn-2Q@comcast.com...
: Bill Garber wrote:
:
: > "Michael J. Mahon" <mjmahon@aol.com> wrote in message
: > uNKdnT3_xLumSsvfRVn-og@comcast.com">news:uNKdnT3_xLumSsvfRVn-og@comcast.com...
: > : heuser.marcus@freenet.de wrote:
: > :
: > : > Thats an interesting fellow for sure. He "reverse engineered" (i.e.
: > : > drawing schematics of) a lot of Atari 8 bit hardware, too.
: > :
: > : I've done this for several (more obscure) cards myself--it's time-
: > : consuming to get it right, but sometimes it's the only way.
: >
: > I've started doing a couple cards and quit, mainly because they
: > had PALs or GALs and I don't have the necessary equipment to
: > realize the logic they are set up to accomplish. To simply make
: > a schematic with the traces into and out of a PAL or GAL is useless.
: > You really need to know which are fused in and which are fused out.
: > Otherwise you have nothing, or Nada.  :o)
:
: Agreed--I don't even bother with such cards.  I'm mostly interested
: in reverse-engineering older, pre-PAL cards anyway.

Speaking of which, I have quite the collection of parallel printer cards
I could let you have for a meager fee if you'd like to reverse engineer
them, or perhaps let you have them to reverse engineer on loan so I could
have schematics so I can mod them into dual direction cards. One or two of
them might already be dual direction compatible. I'm not sure. Would be nice
to be able to use them to pass data between it and a ECP or ECP port on PC.

: > : > As for the memory card: I wouldn't like the idea of "slaughtering"
the
: > : > card and the SIMMs and the process of building his card is quiet
time
: > : > consuming, I guess. But people in Eastern European countries have
less
: > : > money to spend, normally, and try to invent "home solutions".
: > : > Especially engineers like him.
: > :
: > : But 1MB Apple memory expansions for the IIgs are a dime a dozen,
: > : and most users have some sitting around...
: >
: > The cheapest one I've gotten was $5 individually, but have gotten a few
: > thrown in with a larger lot of other cards, or other items.
:
: That's the way I got most of mine, too.  But they are certainly cheaper
: than a prototyping card if you can use them to build a project.  And the
: world is in no danger of "running out" of 1MB IIgs memory cards.  ;-)

That's how I got most of what I have left. I've been looking at the
possibility of a 1-4 MB IIe memory card. I think I have enough info
now to accomplish it, but the cost is not pretty. I'm also not sure
how to make it AppleWorks compatible, which is what most people want.

Nope, the 1MB cards are still being offered on eBay and other areas
for very minimal cost.

: > : 1MB SIMMs are also a dime a dozen (literally), so if you have the
time,
: > : "slaughtering" some ubiquitous hardware hardly seems like a problem.
: >
: > Best deal I've gotten here was $0.05 each. Not quite a dime a dozen.
:
: Yes, I exaggerated slightly--the best deal I've found was also
: five cents each--20 for a dollar.  Of course, the point is that
: they are neither too rare nor too valuable to sacrifice for a
: useful project.

Can you get that deal again, say in the 100's quantity??

Apple II Forever, Apple II Together
Bill @ GarberStreet Enterprizez
---------------------------------------------
Web Site - http://garberstreet.netfirms.com
HOME OF THE RAM-4-GS
---------------------------------------------
Email - willy46pa@comcast.net
---------------------------------------------
File Server - http://68.34.184.147/
Username    - GarberStreet
Password    - all
---------------------------------------------