Thanks for your input.

I need to test it without startup-sequence to see what is happenging with MMU/Caches. You migh be right, if I remove both jumpers, it doesn't seems to affect to anything, BUT if I but both of jumper ON amiga doesn't boot at all, only black screen.
OK 50mhz board supports up to 20mb with ram32 board.
◦16 - 33 MHz boards support 1 MB SIMMs only, possible configurations are 2, 4 and 8 MB
◦50 MHz boards support 4 MB SIMMs, possible configurations are 4, 8, 12, 16 and 20 MB
◦using a 4 MB SIMM requires four 1 MB SIMMs to be installed in sockets 3 to 6, so the 4 MB SIMMs can only be installed into sockets 7 to 10
I have a Commodore A2088, I have updated bios on it, so it supports 16bit ISA networkcards. I would like to use etherbridge software with it, to get my A2000 online.
I have already found out that there are several tools to alloc memory and I can remove memory from Zorro II space with software. Can I map memory to 32 bit space with software?
4mb is just too small amount of memory.
