Programming problem: missing cursor.

Hallo allemaal


Busy with a renovation I have hardly access to my hardware but still have some time to look at some projects. In July 1987 the German magazine 64'er created a board that enable you to expand your C64 up to 256 KB of RAM. I built it and recently, when moving some boxes, I ran into the original card. That gave me the idea to create a new one with some extras. For more info, please see: http://www.baltissen.org/newhtm/C64-256KB.htm

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).

The cold BASIC start does to other subroutines and then outputs the well known texts. But these includes so many other subroutines that I'm afraid that they will clog the Kernal that I want to make. In fact, putting text on the screen and updating the color RAM is something that I can do myself. The main problem: what do I have to do to make the cursor appear and blink? What am I overlooking in these routines started up during the cold BASIC boot?

Thank you in advance?


Met vriendelijke groet,

Ruud Baltissen






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