Original Apple 2 motherboard?

Definitely not original...One of many clones...

Two Prototyping areas is kind of cool....

I have never seen an Apple ][ with White Slots... That would have been my first clue it was a Clone...

MarkO

mwlay,

This is definitely not an Apple II Motherboard.
It must be some sort of clone, but I couldn't say from what.

I have never seen one quite like this.

When I look at Picture #1, I wonder why the normal
Power Connector has been removed and replaced with
what seems to be a set of IIgs connector pins?

Very odd.

Steven

When I look at Picture #1, I wonder why the normal Power Connector has been removed and replaced with what seems to be a set of IIgs connector pins?

Dorkbert,

So it's one of those things that
make you scratch body parts and makes you go
"Hmmmm?" lol

Steven

Hello mwlay,

first of all welcome to the community,

in general your question has been answered....

but several remarks are still missing:

in Europe that kind of clone mainboard has been rather common in the years from 1980 to 1982.
There also the white slots have been very common and often sold so they are rather commen at
clone mainboards of that age.

It´s in general a clone of a rev.4 mainboard and is easy identified by the prototyping areaa.
The real rare portion of the board is the fact that it has been mofified to the use of 4164 RAM Chips.
This was rather well known mod in the years from 1982 to 1983.

There have been 3 kinds of mods:
the CRAM 192 kB mod ( sold as Kit )
the Phantom 192 kB mod ( sold as Kit )
and finally the most common and advanced mod published in the German electronic Magazine "c´t".

In all 3 cases the banks have been switched by software and adressing of the annunciators of the gameport.

In general such mods have been populated entirely with the 4164 chips offering full 192 kB on the mainboard.

In general only the 16 kB language card demanded to be one not connected to the mainboard by cable like
the commenly used language cards of that days to avoid conflict between the 4116 at the languagecard and the
4164 chips at the mainboard.

You may download from my site the 3 different descriptions of the possible modification:
http://www.appleii-box.de/H004_AppleII192kBupgradepage.htm

In general at such mods there was a switch used to switch between Apple II compatible mode with only 64 kB
adressable ( meaning that switching by the annunciators was disabled ) to avoid conflicts with games that used the
Paddles at the gameport or switching to "extended mode" with the annunciators active and the entire 192 kB availiable.
At this mainbaoard instead the person used Jumperblocks.

The powerpins in one line also have been common due to the fact that a bunch of clone power supplies from Taiwan
had that kind of connectors.

sincerely speedyG