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cc65/libsrc/apple2/chline.s

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This commit was generated by cvs2svn to compensate for changes in r2, which included commits to RCS files with non-trunk default branches. git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81
2000-05-28 13:40:48 +00:00
;
; Ullrich von Bassewitz, 08.08.1998
;
New version from Oliver Schmidt git-svn-id: svn://svn.cc65.org/cc65/trunk@3421 b7a2c559-68d2-44c3-8de9-860c34a00d81
2005-03-26 17:03:30 +00:00
; void __fastcall__ chlinexy (unsigned char x, unsigned char y, unsigned char length);
; void __fastcall__ chline (unsigned char length);
This commit was generated by cvs2svn to compensate for changes in r2, which included commits to RCS files with non-trunk default branches. git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81
2000-05-28 13:40:48 +00:00
;
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
.export _chlinexy, _chline, chlinedirect
Introduced internal gotoxy that pops both parameters. About all CONIO functions offering a <...>xy variant call popa _gotoxy By providing an internal gotoxy variant that starts with a popa all those CONIO function can be shortened by 3 bytes. As soon as program calls more than one CONIO function this means an overall code size reduction.
2016-06-05 12:58:38 +00:00
.import gotoxy, cputdirect
New version from Oliver Schmidt git-svn-id: svn://svn.cc65.org/cc65/trunk@3421 b7a2c559-68d2-44c3-8de9-860c34a00d81
2005-03-26 17:03:30 +00:00
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
.include "zeropage.inc"
.include "apple2.inc"
This commit was generated by cvs2svn to compensate for changes in r2, which included commits to RCS files with non-trunk default branches. git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81
2000-05-28 13:40:48 +00:00
_chlinexy:
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
pha ; Save the length
Introduced internal gotoxy that pops both parameters. About all CONIO functions offering a <...>xy variant call popa _gotoxy By providing an internal gotoxy variant that starts with a popa all those CONIO function can be shortened by 3 bytes. As soon as program calls more than one CONIO function this means an overall code size reduction.
2016-06-05 12:58:38 +00:00
jsr gotoxy ; Call this one, will pop params
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
pla ; Restore the length and run into _chline
This commit was generated by cvs2svn to compensate for changes in r2, which included commits to RCS files with non-trunk default branches. git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81
2000-05-28 13:40:48 +00:00
_chline:
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
.ifdef __APPLE2ENH__
ldx #'S' ; MouseText character
ldy INVFLG
cpy #$FF ; Normal character display mode?
beq chlinedirect
New version from Oliver Schmidt git-svn-id: svn://svn.cc65.org/cc65/trunk@3421 b7a2c559-68d2-44c3-8de9-860c34a00d81
2005-03-26 17:03:30 +00:00
.endif
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
ldx #'-' | $80 ; Horizontal line, screen code
Reworked version by Oliver Schmidt git-svn-id: svn://svn.cc65.org/cc65/trunk@2913 b7a2c559-68d2-44c3-8de9-860c34a00d81
2004-03-11 21:54:22 +00:00
chlinedirect:
Added CONIO cursor support. For quite some time I deliberately didn't add cursor support to the Apple II CONIO imöplementation. I consider it inappropriate to increase the size of cgetc() unduly for a rather seldom used feature. There's no hardware cursor on the Apple II so displaying a cursor during keyboard input means reading the character stored at the cursor location, writing the cursor character, reading the keyboard and finally writing back the character read initially. The naive approach is to reuse the part of cputc() that determines the memory location of the character at the cursor position in order to read the character stored there. However that means to add at least one additional JSR / RTS pair to cputc() adding 4 bytes and 12 cycles :-( Apart from that this approach means still a "too" large cgetc(). The approach implemented instead is to include all functionality required by cgetc() into cputc() - which is to read the current character before writing a new one. This may seem surprising at first glance but an LDA(),Y / TAX sequence adds only 3 bytes and 7 cycles so it cheaper than the JSR / RTS pair and allows to brings down the code increase in cgetc() down to a reasonable value. However so far the internal cputc() code in question saved the X register. Now it uses the X register to return the old character present before writing the new character for cgetc(). This requires some rather small adjustments in other functions using that internal cputc() code.
2016-06-19 13:03:20 +00:00
stx tmp1
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
cmp #$00 ; Is the length zero?
beq done ; Jump if done
Added CONIO cursor support. For quite some time I deliberately didn't add cursor support to the Apple II CONIO imöplementation. I consider it inappropriate to increase the size of cgetc() unduly for a rather seldom used feature. There's no hardware cursor on the Apple II so displaying a cursor during keyboard input means reading the character stored at the cursor location, writing the cursor character, reading the keyboard and finally writing back the character read initially. The naive approach is to reuse the part of cputc() that determines the memory location of the character at the cursor position in order to read the character stored there. However that means to add at least one additional JSR / RTS pair to cputc() adding 4 bytes and 12 cycles :-( Apart from that this approach means still a "too" large cgetc(). The approach implemented instead is to include all functionality required by cgetc() into cputc() - which is to read the current character before writing a new one. This may seem surprising at first glance but an LDA(),Y / TAX sequence adds only 3 bytes and 7 cycles so it cheaper than the JSR / RTS pair and allows to brings down the code increase in cgetc() down to a reasonable value. However so far the internal cputc() code in question saved the X register. Now it uses the X register to return the old character present before writing the new character for cgetc(). This requires some rather small adjustments in other functions using that internal cputc() code.
2016-06-19 13:03:20 +00:00
sta tmp2
: lda tmp1 ; Screen code
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
jsr cputdirect ; Direct output
Added CONIO cursor support. For quite some time I deliberately didn't add cursor support to the Apple II CONIO imöplementation. I consider it inappropriate to increase the size of cgetc() unduly for a rather seldom used feature. There's no hardware cursor on the Apple II so displaying a cursor during keyboard input means reading the character stored at the cursor location, writing the cursor character, reading the keyboard and finally writing back the character read initially. The naive approach is to reuse the part of cputc() that determines the memory location of the character at the cursor position in order to read the character stored there. However that means to add at least one additional JSR / RTS pair to cputc() adding 4 bytes and 12 cycles :-( Apart from that this approach means still a "too" large cgetc(). The approach implemented instead is to include all functionality required by cgetc() into cputc() - which is to read the current character before writing a new one. This may seem surprising at first glance but an LDA(),Y / TAX sequence adds only 3 bytes and 7 cycles so it cheaper than the JSR / RTS pair and allows to brings down the code increase in cgetc() down to a reasonable value. However so far the internal cputc() code in question saved the X register. Now it uses the X register to return the old character present before writing the new character for cgetc(). This requires some rather small adjustments in other functions using that internal cputc() code.
2016-06-19 13:03:20 +00:00
dec tmp2
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
bne :-
New version from Oliver Schmidt git-svn-id: svn://svn.cc65.org/cc65/trunk@3421 b7a2c559-68d2-44c3-8de9-860c34a00d81
2005-03-26 17:03:30 +00:00
done: rts
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