CAT rutine address

[Fran123]

Hello

In the 464, when doing CAT, what program address does the PC go to? Or in other words, at what address in the firmware does the CAT routine begin?

Thank you.

[andycadley]

CAS CATALOG at #BC9B, isn't it?

[SerErris]

CAS CATALOG at #BC9B, isn't it?

Yes indeed. The Disk controller ROM just patches the CAS vectors and actually BASIC thinks it still reads from Tape. That is because the whole handling is done by the routine and then the contents are provided in RAM as requested. So therefor it is just the jump vector that needs patching and will get patched on ROM init.