funny acting 500+

[Kronos]

The A500 with 512kb is NOT ab A500+ as these all came with 1mb.
(Maybe old board in slighly newer case ?).

The A500+ has a realtime-clock on-board while most 512kb-boards
for the normal A500 came with the clock (the A500 had none).

Two clocks at the same address ? Bad idea !
Bare 512kb-board without clock are known to work, so if you could
just find a way to rurn it off.....

[Kronos]

Oh and maybe you will need to turn the ram-board "off", so it is
recognized as Chip-MEM (I know that it doesn't make sense  ;-) )

[Kronos]

The "+" in A500+ means that it has:

1mb on-board instead of 512kb
Kick2.0 instead of 1.2/1.3

Agnus 8075R0/R5 instead of the 512k/1mb versions.
Denise 8373 instead of 8362
A realtime clock onboard.

[Kronos]

@olegil

Yes you can, if it doesn't have the clock.

Not sure if you have to turn it on or off, but back than a
friend of mine was using a 1.5mb-Chip-MEM-A500+.