Baltissen, GJPAA (Ruud) writes: > > One idea was to start up with my own Kernal that on its turn enables you to > give you a choice out of several regular Kernals and some other goodies. The > idea was to use only those parts of the original Kernal that are really > needed to display a menu. So I started with the reset routine, copied the > various subroutines used there, shortened the RAM test and halted the program > the moment it would do the indirect jump to the cold BASIC start. I expected > to see the well known dark blue rectangle inside the light blue border plus a > cursor. Rectangles, yes, but as you already guessed now: no cursor (I did a > CLI to be sure). > Hmm, sounds like IRQ timer interrupt is not running... Are you servicing the interrupt like the kernal code at $FF48 does ? https://www.pagetable.com/c64ref/c64disasm/#FF48 Much of the setup should be done by calling the CINT vector ($FF81) - but I guess that you've been through that already... See: https://www.pagetable.com/c64ref/kernal/ https://www.pagetable.com/c64ref/c64disasm/#FF81 mvh/UffeReceived on 2023-01-11 13:00:02
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