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cc65/libsrc/c64/kplot.s

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Changed the solution for the PLOT problem with old -02 kernals to that used for the VIC20: PLOT is not an kernal entry but a library function that will do the right stuff. This makes it work with other stuff that calls PLOT, too. git-svn-id: svn://svn.cc65.org/cc65/trunk@4249 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-27 18:45:08 +00:00
;
; Ullrich von Bassewitz, 2002-12-09, 2009-09-27
;
; PLOT replacement function for the C64. The kernal function in the -02 kernals
; does not set the pointer to the color RAM correctly, so we need to fix that.
;
.export PLOT
libsrc/*/kplot.s: Use cbm_kernal.inc symbols, not hardcoded addrs On C64, VIC-20 and Plus/4, the conio library PLOT routine uses direct calls into the Kernal, including the Kernal PLOT routine that we're replacing. These were previously hardcoded addresses; we change these to use the symbols for those routines defined in cbm_kernal.inc. (This changes no functionality.) To do this, we need to import cbm_kernal.inc in a namespace so we don't have a collision between the PLOT that we're defining and the Kernal definition. We also add a UPDCRAMPTR symbol (used by kplot for VIC-20 and C64) to the direct entry kernal routines in in cbm_kernal.inc, and expand the comments describing what the "direct entry" Kernal routines are. <greg.king5@verizon.net> (GitHub: greg-king5) came up with this idea and did initial testing of it. This has been tested on VICE xvic, x64 and xplus4 emulators with a program that does a cputs() call (github.com/0cjs/vic20cc65) to confirm that it works the same way after as it did before.
2019-10-24 04:46:41 +00:00
.scope KERNAL
.include "cbm_kernal.inc"
.endscope
Changed the solution for the PLOT problem with old -02 kernals to that used for the VIC20: PLOT is not an kernal entry but a library function that will do the right stuff. This makes it work with other stuff that calls PLOT, too. git-svn-id: svn://svn.cc65.org/cc65/trunk@4249 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-27 18:45:08 +00:00
.proc PLOT
bcs @L1
libsrc/*/kplot.s: Use cbm_kernal.inc symbols, not hardcoded addrs On C64, VIC-20 and Plus/4, the conio library PLOT routine uses direct calls into the Kernal, including the Kernal PLOT routine that we're replacing. These were previously hardcoded addresses; we change these to use the symbols for those routines defined in cbm_kernal.inc. (This changes no functionality.) To do this, we need to import cbm_kernal.inc in a namespace so we don't have a collision between the PLOT that we're defining and the Kernal definition. We also add a UPDCRAMPTR symbol (used by kplot for VIC-20 and C64) to the direct entry kernal routines in in cbm_kernal.inc, and expand the comments describing what the "direct entry" Kernal routines are. <greg.king5@verizon.net> (GitHub: greg-king5) came up with this idea and did initial testing of it. This has been tested on VICE xvic, x64 and xplus4 emulators with a program that does a cputs() call (github.com/0cjs/vic20cc65) to confirm that it works the same way after as it did before.
2019-10-24 04:46:41 +00:00
jsr KERNAL::PLOT ; Set cursor position using original ROM PLOT
jmp KERNAL::UPDCRAMPTR ; Set pointer to color RAM to match new cursor position
Changed the solution for the PLOT problem with old -02 kernals to that used for the VIC20: PLOT is not an kernal entry but a library function that will do the right stuff. This makes it work with other stuff that calls PLOT, too. git-svn-id: svn://svn.cc65.org/cc65/trunk@4249 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-27 18:45:08 +00:00
libsrc/*/kplot.s: Use cbm_kernal.inc symbols, not hardcoded addrs On C64, VIC-20 and Plus/4, the conio library PLOT routine uses direct calls into the Kernal, including the Kernal PLOT routine that we're replacing. These were previously hardcoded addresses; we change these to use the symbols for those routines defined in cbm_kernal.inc. (This changes no functionality.) To do this, we need to import cbm_kernal.inc in a namespace so we don't have a collision between the PLOT that we're defining and the Kernal definition. We also add a UPDCRAMPTR symbol (used by kplot for VIC-20 and C64) to the direct entry kernal routines in in cbm_kernal.inc, and expand the comments describing what the "direct entry" Kernal routines are. <greg.king5@verizon.net> (GitHub: greg-king5) came up with this idea and did initial testing of it. This has been tested on VICE xvic, x64 and xplus4 emulators with a program that does a cputs() call (github.com/0cjs/vic20cc65) to confirm that it works the same way after as it did before.
2019-10-24 04:46:41 +00:00
@L1: jmp KERNAL::PLOT ; Get cursor position
Changed the solution for the PLOT problem with old -02 kernals to that used for the VIC20: PLOT is not an kernal entry but a library function that will do the right stuff. This makes it work with other stuff that calls PLOT, too. git-svn-id: svn://svn.cc65.org/cc65/trunk@4249 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-27 18:45:08 +00:00
.endproc
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