Can I use these for 1MB A4000 Custom Kickstart

[Chucky]

27c400 can  contain 512Kilobytes of data..

so 27C400 is what you need.. YES!..

that is what I have used..  27C800 when doing a kickstartswitch

[Chucky]

I always testin UAE..

and yes. it works fine with romy and 512k rom

[Chucky]

I'll be sure to post results after I get the chips and work through the process. I've put off doing this for too long and I am dying to finally get this working. I'm also looking to use an 060 via one of the adapter boards so I need the 060 libraries in rom to get this to work.

060 libs are NOT romable..  it is a patch in the kickstart that disables the FPU.. nothing more.. (so it will not crash at startup)

libs will still be needed in libs: