Hi
All of the above codes point to a bad IC
2 short Memory parity error [A memory parity error has occurred in the first 64K of RAM. The RAM IC is probably bad]
3 short Base 64K memory failure [A memory failure has occurred in the first 64K of RAM. The RAM IC is probably bad]
4 short System timer failure [The system clock/timer IC has failed or there is a memory error in the first bank of memory]
Source -
here
have swapped out RAM to check
? [If have spare stick of RAM to test or borrow one from a friend if possible]
atb
Law-II