C64 BASIC ROM - interchangeable with VIC?

[oracle_jedi]

Assuming the answer is yes, but figured one of you guys would know for sure..

 

The C64 BASIC ROM is interchangeable with the VIC?  My 64 is booting up to a blank blue screen.  Some cartridge images are working, but many games on the backbit/easyflash/ultimate ii carts have stopped working.

[oracle_jedi]

Well the part nos appear to be different, so I am changing my assumption, to they are not interchangeable.

[brain]

Sorry, no.

[carlsson]

The code to a great deal may be the same, but if nothing else BASIC is assembled to different addresses: $A000 on the C64 and $C000 on the VIC-20.

 

Are you sure it is a ROM fault, not a partial PLA fault?

[oracle_jedi]

Good question on the PLA.

 

So I found this web site: https://www.vintagecomputer.net/commodore/64/commodore_64/index.cfm

 

And dropped the diagnostic image onto the Backbit cart:

 

Wow, looks like all kinds of problems!

 

 

[carlsson]

I believe a few of those cassette, user and serial port tests fail because you don't have the proper dongles plugged in. Not sure why it should report bad SID unless it fails to detect paddles.