exxos's Atari, Amiga & retro forum

Yeah! That's the way it should be.
Now check WHDLoad version - last one is 18.5,
If You have 18.3 - i recommend to update it,
since it was a bit buggy..

So is best idea find motherboard from 500+
Then upgrade to 2mb chip ram
I found one already with 2mb chip ram
but lad want 130euro
What u thinking friends?
Is worth that money?
I think no
possible to get whole amiga 500 + for maybe few quid more

Well,
any A500 may be upgraded to 2MB ChipRAM, if it is rev.8 you just need 4 ram chips and 74F139, if it is rev.6 rev.5. or rev.3 - Megachip is Your solution..
In other hand, if you may noticed - 8375 Agnuses are very expensive atm,
Analogic is asking 90€ for one, so yeah..
130€ is still a fair price for rev.8 board...

Good news are that one german guy started to work on a fpga replacement for it, once it is done - new 8MB Agnus will see the daylight..
https://www.a1k.org/forum/index.php?threads/73385/

very interesting when ill be available to buy this module
I have rev 6A

It took me a while to get rid of the problem but I think I succeeded
after all I bought a motherboard from the Amiga 500+ with a 2mb chip that there would be no doubt that there is a lack of memory chip
after connecting the TF534 almost everything goes well, nothing breaks out
there are a few things that I don't know the answer to, but one problem is Agnus MOS 8371 used in the rev6A board where 8372a should be

Oh, when 8371 is installed then this is an early rev 6 board, have that one too: See that additional pcb? Ths was needed to add refresh cycle, as 8371 is not able to refresh some ram chips.

I have this on my board as well
But I think my board is different like yours
Expansion Ram Board what I use is A501
Lads tell me if I want change agnus for 8372a I must take out this board what is solder to motherboard?
Agnus 8372a should working on this board is correct?

You have two options here:
A. leave these boards stock
B. remove Agnus socket and this additional pcb and install Megachip...
:idea: :roll:

adding trapdoor is a pain in the ass, this will rather run unstable because of the 8371
Ask Stephen if You don'tbelive me, we had learned this lesson while building TF530's....

So if I put 8372a and remove this board still I'll be problem ?

if You install 8372 - You will not need this additional refresh circuit anymore and Your Amiga will run more stable, but You will have 1MB of Chip ram, wich isn't enough for some games and programs..