Unknown memory expansion for Amiga 500

[flaviosr]

Dear All,
I have looked all over the Amiga Hardware Database but I have not found the picture of a memory card I have found in a "new" Amiga 500!
I am almost sure it is there (since I have always found everything) but I haven't found it.
The Italian sentence only mean "exact side for connection".
There is also a 3 way switch.
Can somebody help?
Thank you

[flaviosr]

There are 4 256k x 4bit memory chips on it, so it's a 1 mb memory card with a single pole, double throw (on/off) switch.

It's for the a500+, to give you 2mb of chip ram. There were lots of clone cards, you won't find them all documented.

Thank you for the help.
I do not have an A500+ to test. Could it be that the switch is used to select 512kb or 1Mb?
mmm...  4 x 256kbit x 4bit is 512 kbyte, right?

[flaviosr]

@BLTCON0
Thank you! How many informations. :-)
I take the occasion to ask two question I have ever had.
Since the Amiga 500 with this memory expansion is still sealed, never opened...
1. Is it possible to check the motherboard revision from software?
2. Similarly, is it possible to know chips revision from software?
I could put the same memory expansion in a well known and opened Amiga 500, but now I am curious...
Thank you

[flaviosr]

Wow! Thanx a lot. The terrible situation is that I'm not at home for one more week but now I'm very curious!
I will check immediately!