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The CIA TOD only stores the time but not the date. Therefore the date set by clock_settime() ist just stored inside the C library for retrieval via clock_gettime(). The "very special" handling of 12AM/PM is based on https://groups.google.com/d/msg/comp.sys.cbm/ysVYSX4AMbc/vHrXCWEhCOUJ saying: ========== 24hr: Wr => Rd => Nx -------------------- 0 : 92 => 12 => 01 <= Switch from 00 to 01 (24-hour notation) 1 : 01 => 01 => 02 2 : 02 => 02 => 03 11 : 11 => 11 => 92 12 : 12 => 92 => 81 <= Switch from 12 to 13 (24-hour notation) 13 : 81 => 81 => 82 14 : 82 => 82 => 83 23 : 91 => 91 => 12 1. column ("24hr"): hour to be tested (decimal) 2. column ("Wr"): hour written to TOD register (BCD) 3. column ("Rd"): hour read from TOD register (BCD) immediately after writing the value in column 2 to see the conversion between AM/PM, if any 4. column ("Nx"): next hour (BCD) after the hour switch ========== Thanks Paul! |
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| apple2 | ||
| atari | ||
| atari2600 | ||
| atari5200 | ||
| atmos | ||
| c16 | ||
| c64 | ||
| c128 | ||
| cbm | ||
| cbm510 | ||
| cbm610 | ||
| common | ||
| conio | ||
| creativision | ||
| dbg | ||
| em | ||
| gamate | ||
| geos-apple | ||
| geos-cbm | ||
| geos-common | ||
| joystick | ||
| lynx | ||
| mouse | ||
| nes | ||
| none | ||
| osic1p | ||
| pce | ||
| pet | ||
| plus4 | ||
| runtime | ||
| serial | ||
| sim6502 | ||
| supervision | ||
| telestrat | ||
| tgi | ||
| vic20 | ||
| zlib | ||
| Makefile | ||