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5493c9e7c2
The Receive Data Register and the Transmit Data Register share share a single address. Accessing that address with STA abs,X in order to fill the Transmit Data Register causes a 6502 false read which causes the Receive Data Register to be emptied. The simplest way to work around that issue - which I chose here - is to move the base address for all ACIA accesses from page $C0 to page $BF. However, that adds an additional cycle to all read accesses. An alternative approach would be to only modify the single line `sta ACIA_DATA,x`. |
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| .. | ||
| emd | ||
| extra | ||
| joy | ||
| mou | ||
| ser | ||
| targetutil | ||
| tgi | ||
| _scrsize.s | ||
| _sys.s | ||
| break.s | ||
| cclear.s | ||
| cgetc.s | ||
| chline.s | ||
| close.s | ||
| closedir.c | ||
| clrscr.s | ||
| color.s | ||
| cout.s | ||
| cpeekc.s | ||
| cputc.s | ||
| crt0.s | ||
| curdevice.s | ||
| cvline.s | ||
| devicedir.s | ||
| dioclose.s | ||
| diocommon.s | ||
| dioopen.s | ||
| dioread.s | ||
| diosectcount.s | ||
| diosectsize.s | ||
| diowrite.s | ||
| dir.h | ||
| doesclrscr.s | ||
| dosdetect.s | ||
| exec.s | ||
| exehdr.s | ||
| filedes.inc | ||
| filedes.s | ||
| filename.s | ||
| get_ostype.s | ||
| getdevice.s | ||
| getres.s | ||
| gettime.s | ||
| gotoxy.s | ||
| gotoy.s | ||
| home.s | ||
| initcwd.s | ||
| iobuf.s | ||
| irq.s | ||
| isdevice.s | ||
| joy_stat_stddrv.s | ||
| joy_stddrv.s | ||
| joyref.s | ||
| kbhit.s | ||
| libref.s | ||
| lseek.s | ||
| mainargs.s | ||
| mcbdefault.s | ||
| mli.inc | ||
| mli.s | ||
| mouse_stat_stddrv.s | ||
| mouse_stddrv.s | ||
| open.s | ||
| opendir.c | ||
| oserrlist.s | ||
| oserror.s | ||
| randomize.s | ||
| rdkey.s | ||
| read.s | ||
| readdir.c | ||
| reboot.s | ||
| revers.s | ||
| rewinddir.c | ||
| rwcommon.s | ||
| settime.s | ||
| syschdir.s | ||
| sysmkdir.s | ||
| sysremove.s | ||
| sysrename.s | ||
| sysrmdir.s | ||
| sysuname.s | ||
| tgi_colors.s | ||
| tgi_stat_stddrv.s | ||
| tgi_stddrv.s | ||
| videomode.s | ||
| vtabz.s | ||
| waitvsync.s | ||
| wherex.s | ||
| wherey.s | ||
| write.s | ||