DOS ain't dead - unnecessary "stc"

unnecessary "stc" (Announce)

posted by CandyMan, 03.07.2024, 17:55

"STC" instructions are unnecessary in "dos7.asm" if there is a jump to error_exit() where the flags are changed and the interrupt is exited with the CF flag set.
stc jmp error_exit ; no, then exit with error

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Complete thread:

Enhanced DR-DOS single-file load (2023 December revision) - ecm, 07.01.2024, 20:43 (Announce)
- Enhanced DR-DOS single-file load (2023 December revision) - roytam, 08.01.2024, 07:26
- Enhanced DR-DOS single-file load (2023 December revision) - Guti, 10.01.2024, 17:09
- Enhanced DR-DOS single-file load (2023 December revision) - Ro2003, 13.01.2024, 09:28
  - Enhanced DR-DOS development - ecm, 14.01.2024, 22:58
    - lDebug boot loading other kernels - ecm, 20.01.2024, 13:24
- Enhanced DR-DOS single-file load (2023 December revision) - CandyMan, 07.06.2024, 16:19
  - Enhanced DR-DOS single-file load (2023 December revision) - ecm, 07.06.2024, 17:12
    - Enhanced DR-DOS single-file load (2023 December revision) - CandyMan, 07.06.2024, 18:56
      - Enhanced DR-DOS - CD bug - ecm, 07.06.2024, 19:42
        Enhanced DR-DOS - CD bug - ecm, 07.06.2024, 19:47
        Enhanced DR-DOS - CD bug - CandyMan, 07.06.2024, 22:10
        Enhanced DR-DOS - CD bug - ecm, 07.06.2024, 23:17
        Enhanced DR-DOS - CD bug - ecm, 07.06.2024, 23:24
        FAT32 search on GPT partition - CandyMan, 03.07.2024, 18:54
        FAT32 search on GPT partition - tom, 03.07.2024, 19:48
        FAT32 search on GPT partition - tom, 03.07.2024, 19:51
        FAT32 search on GPT partition - CandyMan, 03.07.2024, 20:55
        Kernel ported to JWasm - boeckmann, 08.07.2024, 22:31
        Kernel ported to JWasm - boeckmann, 09.07.2024, 18:22
        Kernel ported to JWasm - Japheth, 10.07.2024, 17:32
        EDR-DOS kernel ported to JWasm - ident86 validated DRBIO port - ecm, 14.07.2024, 21:03
        EDR-DOS kernel ported to JWasm - ident86 validated DRBIO port - boeckmann, 14.07.2024, 22:37
        EDR-DOS kernel ported to JWasm - ident86 validated DRBIO port - CandyMan, 22.07.2024, 16:57
        EDR-DOS kernel ported to JWasm - ident86 validated DRBIO port - boeckmann, 23.07.2024, 20:50
        EDR-DOS kernel ported to JWasm - ident86 validated DRBIO port - ecm, 23.07.2024, 21:34
        EDR-DOS kernel ported to JWasm - ident86 validated DRBIO port - Rugxulo, 24.07.2024, 00:25
        Enhanced DR-DOS - CD bug - CandyMan, 08.06.2024, 09:59
        Enhanced DR-DOS - CD bug - boeckmann, 20.06.2024, 18:00
        Enhanced DR-DOS - CD bug - boeckmann, 30.06.2024, 16:57
        ? - CandyMan, 19.06.2024, 19:45
        ? - glennmcc, 22.06.2024, 02:13
        ? - nico7550, 23.06.2024, 08:18
        unnecessary "stc" - CandyMan, 03.07.2024, 17:55