found more details i have a simple XT clone called a Book 8088 i only got FreeDOS on it when i try to load a shell WITH use!umb.sys it freezes or takes way too long to boot
i cannot test drdos kernel soon yet i gotta make a copy of the cf card and sys the dr dos kernel to test it i am very busy rn. recommend trying out useumbs on 286/at or xt/pc systems. for those who has access to one running freedos! :D On Tue, 2025-05-13 at 10:34 -0500, victoria crenshaw via Freedos-devel wrote: > On Tue, 2025-05-13 at 01:10 +0200, Eric Auer via Freedos-devel wrote: > > > > Hi! > > > > You will need a driver which knows your exact chipset for UMB, > > unless you have a very verbose CMOS BIOS setup giving you some > > fine-grained control over the configuration at boot already. > > > yeah i know > > In your other mail, you show some MEM output which mentions > > a driver LTEMM and FDXMS286, so I guess LTEMM is exactly that > > driver for your chipset? You also load NNANSI, FDAPM, CLOCK (?) > > and CTMOUSE. Not sure what EXP16 is. Shell is 4DOS and you > > have FILES, LASTDRV and STACKS active. > > > LTEMM is the driver for the new EMS card i have > https://www.lo-tech.co.uk/wiki/Lo-tech_2MB_EMS_Board > this is the card > > EXP16 is the packet driver for the > https://theretroweb.com/expansioncards/s/intel-etherexpress-16-isa-tp-aui > > In DRDOS, the MEM listing does not say which EMS driver you > > loaded, but there is no CLOCK loaded there. Rest is similar, > > but DRDOS uses less low RAM. No FILES, STACKS, LASTDRV etc. > oh ok > > > > > In both cases, there are 15 MB of XMS "and" 2 MB of EMS. Do > > UMB work with DR DOS? If yes, in which memory areas? Which > > options or parameters do you use for the UMB and EMS drivers? > CA00-CFFF > and E600-E7FF > > the EMS driver is set to D000 - DFFF page frame > let me give you my configs for both kernels > https://github.com/user-attachments/files/20191174/cherry4.zip > > > > > > > > What exactly is the hardware on which you are running this? > > > > other then "genuine harris 286 @ 25MHz with 16 MB of ram and @ > > > > mb > > > > of > > > > EMS", how would this help you? > > > ok let me show the mobo > > > https://theretroweb.com/motherboards/s/pcchips-m218 > > > it is this board exactly with lo-tech ems board and it has 16 mb > > > of > > > XMS system ram > > > > The VLSI VL82C311L (SCAMP-DT 286) chip of your mainboard chipset > > > > https://theretroweb.com/chips/3036 > > > > supports shadow RAM and hardware-EMS. That means you can use EMS > > on that 286 mainboard without needing a 386 CPU and without the > > need, but also without the ability to load EMM386. Instead, you > > would have to load an EMS driver for EXACTLY that mainboard chip. > i dont know where that driver is. it is fine > > > > > The chip can also be used on mainboards for 386 CPU, by the way. > > > > What is important for you is "Shadow RAM in 640K to 1M range" > > and related features. The chipset can configure areas in 16kB > > or 32kB blocks in the whole upper area from c000:0 to f000:ffff. > > > > Each zone can be either: EMS (4.0 compatible), RAM, ROM / BIOS > > or ISA card, or a combination, where reading and writing have > > different endpoints, for example for shadowing. > > > > Only zones where both reading and writing are configured as RAM > > and not mapped AWAY from the first MB and not used for hardware > > EMS can be used for UMB. The remapping can be useful because it > > lets you use RAM for EMS or XMS which would otherwise be behind > > ROM BIOS or similar at the same address between 640k and 1 MB. > > But of course if some RAM is remapped to > 1 MB, it is no UMB! > > > > You could even write your own driver. Pages 27-29 etc. for UMB, > > continue to 36 to include EMS, etc. If you are VERY bored ;-) > oh ok... let me test this program a bit more then on different PCs > <3 > > > > > Regards, Eric > > > > > > > > > > _______________________________________________ > > Freedos-devel mailing list > > Freedos-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/freedos-devel > > -- > founder of yellow rose group 💛️ > > > > _______________________________________________ > Freedos-devel mailing list > Freedos-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freedos-devel -- founder of yellow rose group 💛️ _______________________________________________ Freedos-devel mailing list Freedos-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-devel
