1
0
mirror of https://github.com/cc65/cc65.git synced 2024-06-15 02:29:32 +00:00
cc65/libsrc/apple2
Oliver Schmidt e47485f925 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 15:03:20 +02:00
..
emd Create static drivers directly from source files. 2014-06-04 23:50:18 +02:00
extra Adjusted constructors. 2016-03-16 16:28:32 +01:00
joy Create static drivers directly from source files. 2014-06-04 23:50:18 +02:00
mou Create static drivers directly from source files. 2014-06-04 23:50:18 +02:00
ser Create static drivers directly from source files. 2014-06-04 23:50:18 +02:00
targetutil directory structure changed from driver-centric to target-centric 2016-05-16 19:49:43 +02:00
tgi Create static drivers directly from source files. 2014-06-04 23:50:18 +02:00
_scrsize.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
_sys.s Allow _sys() to call ROM routines. 2016-03-25 21:57:06 +01:00
break.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
cclear.s Introduced internal gotoxy that pops both parameters. 2016-06-05 14:58:38 +02:00
cgetc.s Added CONIO cursor support. 2016-06-19 15:03:20 +02:00
chline.s Added CONIO cursor support. 2016-06-19 15:03:20 +02:00
close.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
closedir.c Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
clrscr.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
color.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
cout.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
cputc.s Added CONIO cursor support. 2016-06-19 15:03:20 +02:00
crt0.s Moved run location of ONCE segment. 2016-03-17 21:07:19 +01:00
ctype.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
curdevice.s Introduced getcurrentdevice() and implemented it for CBM and Apple. 2012-10-21 14:35:17 +00:00
cvline.s Added CONIO cursor support. 2016-06-19 15:03:20 +02:00
devicedir.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
dioclose.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
diocommon.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
dioopen.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
dioread.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
diosectcount.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
diosectsize.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
diowrite.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
dir.h Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
doesclrscr.s Added Apple II version of doesclrscrafterexit(). 2016-06-05 13:01:42 +02:00
dosdetect.s Adjusted constructors. 2016-03-16 16:28:32 +01:00
exec.s Minor adjustment to recent change. 2016-05-30 14:31:53 +02:00
exehdr.s Moved run location of ONCE segment. 2016-03-17 21:07:19 +01:00
filedes.inc Cosmetic changes from Oliver Schmidt 2005-04-15 08:27:09 +00:00
filedes.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
filename.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
get_ostype.s Adjusted constructors. 2016-03-16 16:28:32 +01:00
getdevice.s I wasn't aware that the unit numbers in the ProDOS device list contain device type identifiers in the low nibble. So if we can't use the device list entries as-is we can as well present the high nibble as low nibble to the user thus providing more meaningful device numbers. 2012-10-15 21:59:51 +00:00
gotoxy.s Introduced internal gotoxy that pops both parameters. 2016-06-05 14:58:38 +02:00
gotoy.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
home.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
initcwd.s Adjusted current working directory initialization on Apple and Atari. 2015-10-15 00:15:38 +02:00
iobuf.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
irq.s Made use of recently added Apple scrcode macro. 2016-03-27 18:27:53 +02:00
isdevice.s I wasn't aware that the unit numbers in the ProDOS device list contain device type identifiers in the low nibble. So if we can't use the device list entries as-is we can as well present the high nibble as low nibble to the user thus providing more meaningful device numbers. 2012-10-15 21:59:51 +00:00
joy_stat_stddrv.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
joy_stddrv.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
kbhit.s Cosmetic changes requested by Oliver Schmidt 2005-03-30 18:17:57 +00:00
libref.s Added library reference tgi_libref to TGI interface. 2013-06-01 12:42:00 +02:00
lseek.s assert parm count 2014-11-24 10:07:16 -08:00
mainargs.s Adjusted constructors. 2016-03-16 16:28:32 +01:00
mcbdefault.s Some fine tuning of the mouse driver interface harmonization. 2014-01-17 21:09:15 +01:00
mli.inc Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
mli.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
mouse_stat_stddrv.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
mouse_stddrv.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
open.s Renamed INITBSS to INIT and INIT to ONCE. 2016-03-06 21:27:19 +01:00
opendir.c Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
oserrlist.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
oserror.s Implement exec() for Atari XDOS. 2016-06-13 20:40:01 +02:00
randomize.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
rdkey.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
read.s Renamed INITBSS to INIT and INIT to ONCE. 2016-03-06 21:27:19 +01:00
readdir.c Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
reboot.s Renamed INITBSS to INIT and INIT to ONCE. 2016-03-06 21:27:19 +01:00
revers.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
rewinddir.c Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
rwcommon.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
syschdir.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
sysmkdir.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
sysremove.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
sysrename.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
sysrmdir.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
systime.s Changed multi-line C comments into another style. 2014-06-30 16:51:07 -04:00
sysuname.s New uname function 2003-08-12 17:24:02 +00:00
textframe.s Added CONIO cursor support. 2016-06-19 15:03:20 +02:00
tgi_colors.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
tgi_stat_stddrv.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
tgi_stddrv.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
toascii.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
videomode.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
vtabz.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
wherex.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
wherey.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00
write.s Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 13:57:12 +02:00