DOS ain't dead

HimemSX, another HimemX variant (Announce)

posted by Japheth , Germany (South), 03.11.2020, 04:53

> I can imagine one reason - if MTRR would be manipulated that way it disable
> Write Back caching for region 4GB-END then it would run in very slow
> uncached mode.

> But from your debug listing I cannot see that any other MTRR
> was touched

There's the SYSCFG msr, which may determine ( at least on AMD systems, haven't checked Intel as of yet ) how the cpu sees memory beyond 4 GB (bit 22 of SYSCFG).

I uploaded SetMtrr (my old VesaMtrr tool, now renamed) to github. It may give a hint.

---
MS-DOS forever!

Complete thread:

• HimemSX, another HimemX variant - Japheth, 21.10.2020, 13:54 (Announce)
  • HimemSX, another HimemX variant - tkchia, 21.10.2020, 17:51
    • HimemSX, another HimemX variant - RayeR, 22.10.2020, 00:48
      • V86 compatibility? Yes, Jemm386 v5.8 - Japheth, 26.10.2020, 19:32
        • V86 compatibility? Yes, Jemm386 v5.8 - RayeR, 27.10.2020, 06:54
          • V86 compatibility? Yes, Jemm386 v5.8 - Japheth, 27.10.2020, 07:49
            • V86 compatibility? Yes, Jemm386 v5.8 - RayeR, 27.10.2020, 13:11
              • V86 compatibility? Yes, Jemm386 v5.8 - RayeR, 28.10.2020, 05:47
                • V86 compatibility? Yes, Jemm386 v5.8 - Japheth, 28.10.2020, 07:06
                  • V86 compatibility? Yes, Jemm386 v5.8 - RayeR, 28.10.2020, 23:26
                    • V86 compatibility? Yes, Jemm386 v5.8 - Japheth, 29.10.2020, 03:16
                      • V86 compatibility? Yes, Jemm386 v5.8 - RayeR, 29.10.2020, 03:31
                        • V86 compatibility? Yes, Jemm386 v5.8 - Japheth, 31.10.2020, 02:20
                          • V86 compatibility? Yes, Jemm386 v5.8 - RayeR, 02.11.2020, 00:31
                            • cwsdpmi version? Possible fix for Borland tools. - Japheth, 02.11.2020, 07:12
                              • cwsdpmi version? Possible fix for Borland tools. - Laaca, 02.11.2020, 19:21
                              • cwsdpmi version? Possible fix for Borland tools. - RayeR, 03.11.2020, 08:00
                                • cwsdpmi version? Possible fix for Borland tools. - Japheth, 03.11.2020, 15:11
                                  • cwsdpmi version? Possible fix for Borland tools. - RayeR, 04.11.2020, 05:43
                                • Possible fix for cwsdpmi trouble - Japheth, 05.11.2020, 07:53
                                  • Possible fix for cwsdpmi trouble - RayeR, 06.11.2020, 13:49
                                    • Possible fix for cwsdpmi trouble - Japheth, 06.11.2020, 14:39
                                      • Possible fix for cwsdpmi trouble - Laaca, 06.11.2020, 19:50
                                        • Possible fix for cwsdpmi trouble - Japheth, 07.11.2020, 01:37
                                      • Possible fix for cwsdpmi trouble - RayeR, 06.11.2020, 20:31
                                        • Possible fix for cwsdpmi trouble - RayeR, 07.11.2020, 06:17
                                        • Possible fix for cwsdpmi trouble - Japheth, 08.11.2020, 11:51
                                          • Possible fix for cwsdpmi trouble - RayeR, 08.11.2020, 17:39
                                            • CWSDPMI r7 NOVCPI test - RayeR, 10.11.2020, 03:16
                                              • CWSDPMI r7 NOVCPI test - Japheth, 10.11.2020, 06:17
                                                • CWSDPMI r7 NOVCPI test - rr, 10.11.2020, 11:47
                                              • CWSDPMI r7 NOVCPI test - Japheth, 10.11.2020, 18:49
                                                • CWSDPMI r7 NOVCPI test - Rugxulo, 10.11.2020, 21:16
                                                • CWSDPMI r7 NOVCPI test - RayeR, 11.11.2020, 02:28
                                                  • CWSDPMI r7 NOVCPI test - Japheth, 11.11.2020, 07:56
                                                    • CWSDPMI r7 NOVCPI test - RayeR, 14.11.2020, 02:04
                                                    • CWSDPMI r7 NOVCPI test - awik, 18.11.2020, 17:59
                                                  • CWSDPMI r7 NOVCPI test - roytam, 17.05.2024, 19:00
        • V86 compatibility? Yes, Jemm386 v5.8 - Zyzzle, 27.10.2020, 15:14
  • HimemSX, another HimemX variant - Zyzzle, 22.10.2020, 03:38
    • HimemSX, another HimemX variant - Japheth, 22.10.2020, 06:39
      • HimemSX, another HimemX variant - Zyzzle, 23.10.2020, 04:54
        • HimemSX, another HimemX variant - Japheth, 23.10.2020, 06:47
          • HimemSX, another HimemX variant - Zyzzle, 23.10.2020, 14:00
            • HimemSX, another HimemX variant - Japheth, 23.10.2020, 17:32
              • HimemSX, another HimemX variant - Laaca, 23.10.2020, 19:14
                • HimemSX, another HimemX variant - RayeR, 23.10.2020, 23:06
              • HimemSX, another HimemX variant - Zyzzle, 24.10.2020, 01:52
                • HimemSX, another HimemX variant - Japheth, 24.10.2020, 05:45
                  • HimemSX, another HimemX variant - Zyzzle, 24.10.2020, 10:50
                    • HimemSX, another HimemX variant - RayeR, 24.10.2020, 23:10
                      • HimemSX, another HimemX variant - Japheth, 03.11.2020, 04:53
                        • HimemSX, another HimemX variant - RayeR, 03.11.2020, 06:50
                        • HimemSX, another HimemX variant - CandyMan, 05.11.2020, 19:14
                      • HimemSX, another HimemX variant - Japheth, 06.11.2020, 08:33
                        • HimemSX, another HimemX variant - RayeR, 06.11.2020, 13:37
    • HimemSX, another HimemX variant - Rugxulo, 22.10.2020, 20:31
      • HimemSX, another HimemX variant - Zyzzle, 23.10.2020, 04:37
        • HimemSX, another HimemX variant - RayeR, 23.10.2020, 23:13
        • HimemSX, another HimemX variant - marcov, 24.10.2020, 01:07
  • HimemSX Issues - Khusraw, 22.10.2020, 21:52
    • HimemSX Issues - Japheth, 23.10.2020, 05:04