hello im a total newb to amiga hardware and have just been messing around with some stuff ive found here and there.
anyway ive got an a500 rev.6a mobo that ive enabled 1mb agnus on by cutting the jp7a tracks and the botom and middle jp2 pads and conecting the top and middle jp2 pads.
i then soddered in 4 100ns 44256 4-bit x 256K chips.
then i atempted to replace the 1.3 rom that was there with a 3.1 rom chip i found when i booted up the first time i got the insert 3.1 workbench disk screen i then shut down and tryed to reboot with the disk in the drive now every boot up results in no video and a bliking keyboard code. if i replace the 1.3 rom boots up normaly. is there any special pin out configuration i need or any advice out there?
