In the Option Rom, I push all the code from the ROM to the ALTLCD, then I populate 65215 & 65216 with the memory location 64448 which is the first byte of the ALTLCD. That turns the LINE feature in the NEC Basic on. So whenever the Line function is called, it jumps to the code that is in ALTLCD.
That allows me to put a piece of BASIC code at the beginning of the program that requires LINE. That one liner, calls the 7 byte loader code which populates the ALTLCD with the LINE code before it starts. And when the program is finished, ALTLCD can be used for whatever it needs to be used for. Kurt On Thu, Sep 12, 2019, at 2:00 PM, John R. Hogerhuis wrote: > > > On Thu, Sep 12, 2019 at 1:46 PM Kurt McCullum <ku...@fastmail.com> wrote: >> __ >> Thanks Ken. >> >> That is definitely an option if I want to put the individual Pokes into the >> basic program. Which I may end up having to do. I was hoping for some bit of >> memory that I could count on always being there but at this point I am >> realizing that there may not be such a thing. I have the whole thing working >> if I poke the 7 bytes into ram (right now the top of ALTLCD). I can call >> that routine and it loads the LINE code into ALTLCD and the BASIC program is >> happy to use it. I put another chunk of code in the ROM for the XFER program >> and the same approach works to pull it from ROM into ALTLCD and then run. >> The only catch right now is the 7 byte load routine has to be poked into ram >> and then called. >> > > How do you call the LINE routine? > > -- John.
