Re: CHRGET, how does it work?

From: Anders Carlsson <*anders.carlsson_at_sfks.se*> Date: Thu, 26 Oct 2017 11:20:33 +0200 Message-ID: <E29EF9E47570498E887BD83099B58C6F@ryds> · anders.carlsson_at_sfks.se

Ruud Baltissen wrote:

> lda $EA60 ; get byte to scan, address set by call routine

> The problem I have is the instruction "lda $EA60". Lee's comment says that 
> $EA60 stands for RTS/NOP but I take that with some grains of salt.

Forgive me if I'm barking up the wrong tree, but isn't the entire CHRGET 
routine in zeropage RAM, which means it keeps modifying itself all the time? 
Thus the $EA60 would be a placeholder in ROM before copying the routine to 
RAM and you would want to look for a routine that modifies the ZP as the 
program is interpreted.

Best regards

Anders Carlsson

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